Patent Publication Number: US-2021163617-A1

Title: Therapeutic combination of 4-1 bb agonists with anti-cd20 antibodies

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of International Application No. PCT/EP2019/055946, filed Mar. 11, 2019, which claims priority from EP Application No. 18161435.5 filed Mar. 13, 2018. The contents of each of the foregoing applications are incorporated herein by reference in its entirety. 
    
    
     SEQUENCE LISTING 
     This application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Sep. 8, 2020, is named P34718-US_SeqListing.txt and is 302,951 bytes in size. 
     FIELD OF THE INVENTION 
     The present invention relates to combination therapies employing a 4-1BB (CD137) agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular a CD19-targeted 4-1BBL antigen binding molecule, and specific antibodies which bind human CD20, the use of these combination therapies for the treatment of cancer and methods of using the combination therapies. 
     BACKGROUND 
     B-cell proliferative disorders describe a heterogeneous group of malignancies that includes both leukemias and lymphomas. Lymphomas develop from lymphatic cells and include two main categories: Hodgkin lymphomas (HL) and the non-Hodgkin lymphomas (NHL). In the United States, lymphomas of B cell origin constitute approximately 80-85% of all non-Hodgkin lymphoma cases, and there is considerable heterogeneity within the B-cell subset, based upon genotypic and phenotypic expression patterns in the B-cell of origin. For example, B cell lymphoma subsets include the slow-growing indolent and incurable diseases, such as Follicular lymphoma (FL) or chronic lymphocytic leukemia (CLL), as well as the more aggressive subtypes, mantle cell lymphoma (MCL) and diffuse large B cell lymphoma (DLBCL). Despite the availability of various agents for the treatment of B-cell proliferative disorders, there is an ongoing need for development of safe and effective therapies to prolong remission and improve cure rates in patients. 
     A strategy currently being investigated is the engagement of T cells against malignant B cells. In order to effectively engage T cells against malignant B cells, two recent approaches have been developed. These two approaches are: 1) the administration of T cells engineered ex vivo to recognize tumour cells (also known as chimeric antigen receptor-modified T cell therapy or CAR-T cells) (Maude et al., N Engl J Med (2014) 371,1507-1517); and, 2) the administration of agents that activate endogenous T cells, such as bispecific antibodies (Oak and Bartlett, Expert Opin Investig Drugs (2015) 24, 715-724). An example of the first approach is reported in the study by Maude et al., in which 30 adult and pediatric patients were treated with autologous T cells transduced with a CD19-directed chimeric antigen receptor lentiviral vector (CTL019 CAR-T cells). The result was a sustained remission based upon a 6-month event-free survival rate of 67% and an overall survival rate of 78%. However, all patients had cytokine release syndrome (CRS) (associated with tumour burden), with 27% of patients having severe CRS. Central nervous system toxicities of unknown cause were also noted at high frequencies. The second approach, which involves activating endogenous T cells to recognize tumour targets, bypasses this hurdle of scalability, and can also provide competitive efficacy, safety data and potentially long term durations of response. In different CD20 +  hematologic malignancies, this approach is best exemplified by blinatumomab, a CD19 CD3 targeting T cell bispecific molecule (Bargou et al., Science (2008) 321, 974-977) that was recently approved for patients with minimal residual disease-positive acute lymphocytic leukemia (ALL). This compound, which is composed of two single chain Fv fragments (the so called BiTE® format), directs the lysis of CD19 +  cells by cytolytic T cells. The primary constraint of blinatumomab is its short half-life (approximately 2 hours), which necessitates continuous infusion via a pump over 4-8 weeks. Furthermore, severe CRS and CNS toxicity have also been frequently observed (Klinger et al., Blood. 2012; 119(26):6226-6233). In patients receiving blinatumomab in all clinical trials, neurological toxicities have occurred in approximately 50% of patients, and the types of toxicities observed are well-defined in the package insert. 
     4-1BB (CD137), a member of the TNF receptor superfamily, was first identified as an induciable molecule expressed by activated by T cells (Kwon and Weissman, Proc Natl Acad Sci USA (1989) 86, 1963-1967). Subsequent studies demonstrated that many other immune cells also express 4-1BB, including NK cells, B cells, NKT cells, monocytes, neutrophils, mast cells, dendritic cells (DCs) and cells of non-hematopoietic origin such as endothelial and smooth muscle cells (Vinay and Kwon, Cell Mol Immunol. (2011) 8, 281-284). Expression of 4-1BB in different cell types is mostly inducible and driven by various stimulatory signals, such as T-cell receptor (TCR) or B-cell receptor triggering, as well as signaling induced through co-stimulatory molecules or receptors of pro-inflammatory cytokines (Diehl et al., J Immunol (2002) 168, 3755-3762; Zhang et al., J Immunol (2010) 184, 787-795). 
     4-1BB ligand (4-1BBL or CD137L) was identified in 1993 (Goodwin et al., Eur J Immunol. (1993) 23, 2631-2641). It has been shown that expression of 4-1BBL was restricted on professional antigen presenting cells (APC) such as B-cells, DCs and macrophages. Inducible expression of 4-1BBL is characteristic for T-cells, including both αβ and γδ T-cell subsets, and endothelial cells (Shao and Schwarz, J Leukoc Biol (2011) 89, 21-29). 
     Co-stimulation through the 4-1BB receptor (for example by 4-1BBL ligation) activates multiple signaling cascades within the T cell (both CD4 +  and CD8 +  subsets), powerfully augmenting T cell activation (Bartkowiak and Curran, Front Oncol (2015) 5, 117). In combination with TCR triggering, agonistic 4-1BB-specific antibodies enhance proliferation of T-cells, stimulate lymphokine secretion and decrease sensitivity of T-lymphocytes to activation-induced cells death (Snell et al., Immunol Rev (2011) 244, 197-217). This mechanism was further advanced as the first proof of concept in cancer immunotherapy. In a preclinical model administration of an agonistic antibody against 4-1BB in tumor bearing mice led to potent anti-tumor effect (Melero et al., Nature Med (1997) 3, 682-685). Later, accumulating evidence indicated that 4-1BB usually exhibits its potency as an anti-tumor agent only when administered in combination with other immunomodulatory compounds, chemotherapeutic reagents, tumor-specific vaccination or radiotherapy (Bartkowiak and Curran, Front Oncol (2015) 5, 117). 
     Signaling of the TNFR-superfamily needs cross-linking of the trimerized ligands to engage with the receptors, so does the 4-1BB agonistic antibodies which require wild type Fc-binding (Li and Ravetch, Science (2011) 333, 1030-1034). However, systemic administration of 4-1BB-specific agonistic antibodies with the functionally active Fc domain resulted in influx of CD8 +  T-cells associated with liver toxicity (Dubrot et al., Cancer Immunol Immunother (2010) 59, 1223-1233) that is diminished or significantly ameliorated in the absence of functional Fc-receptors in mice. In the clinic, an Fc-competent 4-1BB agonistic Ab (BMS-663513) (NCT00612664) caused a grade 4 hepatitis leading to termination of the trial (Simeone and Ascierto, J Immunotoxicol (2012) 9, 241-247). Therefore, there is a need for effective and safer 4-1BB agonists. 
     Fusion proteins composed of one extracellular domain of a 4-1BB ligand and a single chain antibody fragment (Hornig et al., J Immunother (2012) 35, 418-429; Muller et al., J Immunother. (2008) 31, 714-722) or a single 4-1BB ligand fused to the C-terminus of a heavy chain (Zhang et al., Clin Cancer Res (2007)13, 2758-2767) have been made. WO 2010/010051 discloses the generation of fusion proteins that consist of three TNF ligand ectodomains linked to each other and fused to an antibody part. In the present invention, antigen binding molecules composed of a trimeric and thus biologically active 4-1BB ligand and an antigen binding domain specific for the tumor antigen CD19 and an an Fc-region devoid of FcγR-binding, are shown particularly stable and robust (herein named as CD19-4-1BBL). These constructs are disclosed in WO 2016/075278 and replace unspecific FcγR-mediated crosslinking responsible for Fc-mediated toxicity, by CD19-targeted B cell specific crosslinking. 
     CD19 is an ideal target for immunotherapy of B-cell malignancies as it is expressed on the surface of B-cells and is almost specific to these cells. CD19 is more broadly expressed than CD20 on B cells during the B cell development, so typically a CD20 positive cell will also expressed CD19. During differentiation of B cells towards plasma cells (antibody-secreting cells), B cells down-regulates CD20 expression. Sometimes, B cell lymhomas also down-regulate CD20 expression, but remain positive for CD19. Therefore, targeting both CD19 and CD20 would cover broadly the diseased B cells in lymphomas, which might also deviate the selection pressure from CD20 to both CD19 and CD20. Though it is not known if CD19 contributes directly to B cell carcinogenesis, its expression is highly conserved on most B cell tumors such as acute lymphoblastic leukemias (ALL), chronic lymphocytic leukemias (CLL) and B cell lymphomas. In acute leukemias CD19 is steadily and continuously expressed on almost all subtypes while only a small number of leukemias express CD20. 
     There is thus still a need for new compounds and combinations which have the potential to significantly contribute to the treatment of patients with B-cell proliferative disorders such as NHL and CLL. It has been found that an excellent anti-tumor effect is achieved when the CD19-targeted 4-1BBL antigen binding molecule is combined with specific antibodies which bind human CD20. Thus, we herein describe a novel combination therapy for cancer with B cell malignancy. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a 4-1BB (CD137) agonist 4-1BB (CD137) agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular an antigen binding molecule comprising three ectodomains of 4-1BBL, and its use in combination with antibodies that bind human CD20, in particular rituximab or obinutuzumab, in a method for treating or delaying progression of cancer, more particularly for treating or delaying progression of B-cell proliferative disorders. It has been found that the combination therapy described herein is more effective in inhibiting tumor growth and eliminating tumor cells than treatment with anti-CD20 antibodies alone. 
     In one aspect, the invention provides 4-1BB (CD137) agonist for use in a method for treating or delaying progression of cancer, wherein the 4-1BB agonist is used in combination with an anti-CD20 antibody and wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular the 4-1BB agonist comprises three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to a tumor-associated antigen. 
     In particular, the 4-1BB agonist is an antigen binding molecule comprising one antigen binding domain capable of specific binding to CD19. In one aspect, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain. In a particular aspect, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain with modifications reducing or preferably eliminating Fcγ receptor binding and/or effector function. 
     In one aspect, the 4-1BB agonist and the anti-CD20 antibody are administered concomitant, or simultaneously. In a further aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. 
     In one aspect, the invention provides a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist comprises three ectodomains of 4-1BBL or fragments thereof. In a further aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer, wherein the 4-1BB agonist is a molecule comprising three ectodomains of 4-1BBL or fragments thereof and wherein the ectodomains of 4-1BBL comprise an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO: 6, SEQ ID NO:7 and SEQ ID NO:8, particularly the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:5. More particularly, the ectodomains of 4-1BBL comprise an amino acid sequence of SEQ ID NO:5. 
     In one aspect, the invention provides 4-1BB (CD137) agonist for use in a method for treating or delaying progression of cancer, wherein the 4-1BB agonist is used in combination with an anti-CD20 antibody and wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19. 
     In one aspect, the antigen binding molecule comprising at least one antigen binding domain capable of specific binding to CD19 and three ectodomains of 4-1BBL or fragments thereof will not be internalized by CD19-expressing B cells. In another aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to CD19 and three ectodomains of 4-1BBL or fragments thereof, wherein the antigen binding domain capable of specific binding to CD19 comprises
     (a) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:9, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:10, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:11, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:14, or   (b) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20.   

     In a particular aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to CD19 and three ectodomains of 4-1BBL or fragments thereof, wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:22 or wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. In a particular aspect, the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. 
     In one aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. In particular, the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. More particularly, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces binding to an Fc receptor and/or effector function. In a particular aspect, the 4-1BB agonist comprises an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     In another aspect of the invention, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     In another aspect, the invention provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     In one aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19 comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:22 or a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:24, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     In a particular aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:39 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:40; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:49 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:50; 
     j) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     k) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; and 
     l) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:51 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:52. 
     In another aspect, the invention provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     In a particular aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of
     (a) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:53,   (b) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48 and a fusion protein comprising the amino acid sequence of SEQ ID NO:53;   (c) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:54, and   (d) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48, and a fusion protein comprising the amino acid sequence of SEQ ID NO:55.   

     In another aspect, the invention provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an anti-CD19/anti-4-1BB bispecific antibody. 
     In a further aspect, the invention provides 4-1BB (CD137) agonist for use in a method for treating or delaying progression of cancer, wherein the 4-1BB agonist is used in combination with an anti-CD20 antibody and wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to FAP. 
     In one aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to FAP and three ectodomains of 4-1BBL or fragments thereof, wherein the antigen binding domain capable of specific binding to FAP comprises
     (a) a heavy chain variable region (V H FAP) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:96, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:97, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:98, and a light chain variable region (V L FAP) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:99, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:100, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:101, or   (b) a heavy chain variable region (V H FAP) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:102, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:103, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:104, and a light chain variable region (V L FAP) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:105, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:106, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:107.   

     In a particular aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to FAP and three ectodomains of 4-1BBL or fragments thereof, wherein the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising an amino acid sequence of SEQ ID NO:108 and a light chain variable region (V L FAP) comprising an amino acid sequence of SEQ ID NO:109 or wherein the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising an amino acid sequence of SEQ ID NO:110 and a light chain variable region (V L FAP) comprising an amino acid sequence of SEQ ID NO:111. In a particular aspect, the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising an amino acid sequence of SEQ ID NO:110 and a light chain variable region (V L FAP) comprising an amino acid sequence of SEQ ID NO:112. 
     In one aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to FAP is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. In particular, the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. More particularly, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces binding to an Fc receptor and/or effector function. In a particular aspect, the 4-1BB agonist comprises an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     In another aspect of the invention, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to FAP,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     In another aspect, the invention provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to FAP, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     In one aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to FAP comprising a heavy chain variable region (V H FAP) comprising the amino acid sequence of SEQ ID NO:108 and a light chain variable region (V L FAP) comprising the amino acid sequence of SEQ ID NO:109 or a heavy chain variable region (V H FAP) comprising the amino acid sequence of SEQ ID NO:110 and a light chain variable region (V L FAP) comprising the amino acid sequence of SEQ ID NO:111, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     In a particular aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:112, a first light chain comprising the amino acid sequence of SEQ ID NO:113, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:112, a first light chain comprising the amino acid sequence of SEQ ID NO:113, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:112, a first light chain comprising the amino acid sequence of SEQ ID NO:113, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:112, a first light chain comprising the amino acid sequence of SEQ ID NO:113, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:114, a first light chain comprising the amino acid sequence of SEQ ID NO:115, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     f) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:114, a first light chain comprising the amino acid sequence of SEQ ID NO:115, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:114, a first light chain comprising the amino acid sequence of SEQ ID NO:115, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:114, a first light chain comprising the amino acid sequence of SEQ ID NO:115, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:113, a first heavy chain comprising the amino acid sequence of SEQ ID NO:116 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:117; and 
     j) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:115, a first heavy chain comprising the amino acid sequence of SEQ ID NO:118 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:119. 
     In another aspect, the invention provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to FAP,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     In another aspect, the invention provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is an anti-FAP/anti-4-1BB bispecific antibody. 
     In all these aspects, the invention further provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the anti-CD20 antibody comprises is a Type I anti-CD20 antibody. In particular, the anti-CD20 antibody is rituximab. In another aspect, the invention further provides a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the anti-CD20 antibody is a Type II anti-CD20 antibody. In particular, the anti-CD20 antibody is obinutuzumab. In one aspect, the anti-CD20 antibody is an afucosylated anti-CD20 antibody. In a further aspect, the anti-CD20 antibody is rituximab or obinutuzumab. 
     In another aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody as defined herein before, wherein the 4-1BB agonist is a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and wherein the combination is administered at intervals from about about one week to three weeks. 
     In another aspect, provided is a 4-1BB agonist for use in a method for treating or delaying progression of cancer in combination with an anti-CD20 antibody, wherein the 4-1BB agonist is a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and wherein a pretreatment with an Type II anti-CD20 antibody, preferably obinutuzumab, is performed prior to the combination treatment, wherein the period of time between the pretreatment and the combination treatment is sufficient for the reduction of B-cells in the individual in response to the Type II anti-CD20 antibody, preferably obinutuzumab. 
     In a further aspect, the invention provides a pharmaceutical product comprising (A) a first composition comprising as active ingredient a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and a pharmaceutically acceptable excipient; and (B) a second composition comprising as active ingredient an anti-CD20 antibody and a pharmaceutically acceptable excipient, for use in the combined or simultaneous treatment of a disease, in particular cancer. 
     In another aspect, provided is a pharmaceutical composition which comprises a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and a pharmaceutically acceptable excipient, and a second medicament comprising an anti-CD20 antibody. In one aspect, the pharmaceutical composition is for use as medicament. In particular, the pharmaceutical composition is for use in in the treatment of B-cell proliferative disorders, in particular a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     In an additional aspect, the invention provides a kit for treating or delaying progression of cancer in a subject, comprising a package comprising (A) a first composition comprising as active ingredient a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and a pharmaceutically acceptable excipient; and (B) a second composition comprising as active ingredient an anti-CD20 antibody and a pharmaceutically acceptable excipient and (C) instructions for using the compositions in a combination therapy. 
     In a further aspect, the invention relates to the use of a combination of a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and an anti-CD20 antibody in the manufacture of a medicament for treating or delaying progression of a proliferative disease, in particular cancer. 
     In particular, provided is the use of a combination of a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and an anti-CD20 antibody in the manufacture of a medicament for treating a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     In another aspect, the invention provides a method for treating or delaying progression of cancer in a subject comprising administering to the subject an effective amount of a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and an effective amount of an anti-CD20 antibody. In particular, the invention relates to a method for treating or delaying progression of cancer in a subject, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP. In one aspect, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain. In a particular aspect, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain with modifications reducing Fcγ receptor binding and/or effector function. In a particular aspect, the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof. More particularly, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and an antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP. 
     In a further aspect, the invention provides a method for treating or delaying progression of cancer in a subject comprising administering to the subject an effective amount of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and an effective amount of an anti-CD20 antibody, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. In particular, the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody are administered intravenously or subcutaneously. In a further aspect, the the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, is administered concomitant with the anti-CD20 antibody. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A ,  FIG. 1B ,  FIG. 1C ,  FIG. 1D ,  FIG. 1E ,  FIG. 1F  shows particular CD19-4-1BBL antigen binding molecules as used in the Examples. These molecules are described in more detail in Examples 1 and 2, respectively. The thick black point stands for the knob-into-hole modification.  FIG. 1A  shows a monovalent CD19 4-1BBL-trimer containing antigen binding molecule with amino acid modifications in the CH1 and CL domain adjacent to the 4-1BBL dimer and 4-1BBL monomer. As it comprised the CD19 binder 8B8-018, it was named mono CD19(018)-4-1BBL herein. The construct shown in  FIG. 1B  differs from 1A in that it comprises the CD19 binder 8B8-2B11 and was thus termed mono CD19(2B11)-4-1BBL.  FIG. 1D  shows the bivalent construct with binder CD19(018), termed bi CD19(018)-4-1BBL.  FIG. 1C  and  FIG. 1E  show untargeted control molecules (the CD19 binder has been replaced by a non-binding DP47 Fab).  FIG. 1F  shows a monovalent CD19 4-1BBL-trimer containing antigen binding molecule comprising a murine 4-1BBL dimer and a murine 4-1BBL monomer, termed herein hybrid CD19-4-1BBL or CD19-mu4-1BBL. 
         FIG. 2A  illustrates the setup of the assay measuring simultaneous binding of CD19 targeted trimeric split 4-1BBL to murine 4-1BB and human CD19 (Example 2). The graph in  FIG. 2B  shows simultaneous binding of the hybrid surrogate CD19-mu4-1BBL (Analyte 1) to immobilized murine 4-1BB and human CD19 (Analyte 2). 
       In  FIG. 3A ,  FIG. 3B ,  FIG. 3C  it is shown that CD19-4-1BBL could boost activation of NK cells (IFNγ release) that were activated by rituximab or obinutuzumab (Gazyva) when engaging with NHL cell lines, i.e with WSU-DLCL2 (CD19 + CD20 high ) ( FIG. 3A ), SU-DHL-8 (CD19 + CD20 low ) ( FIG. 3B ), or Naml-6 (CD19 + CD20 low ) ( FIG. 3C ). 
         FIG. 4A ,  FIG. 4B ,  FIG. 4C  show that by combining CD19-4-1BBL with rituximab or obinutuzumab (Gazyva) activation of NK cells (CD25 upregulation) is boosted when engaging with NHL cell lines, i.e with WSU-DLCL2 (CD19 + CD20 high ) ( FIG. 4A ), SU-DHL-8 (CD19 + CD20 low ) ( FIG. 4B ), or Naml-6 (CD19 + CD20 low ) ( FIG. 4C ). 
       In  FIG. 5A ,  FIG. 5B ,  FIG. 5C  it is shown that the combination of CD19-4-1BBL and obinutuzumab (Gazyva) boosts activation of NK cells (CD25 upregulation) when engaging with the NHL cell lines WSU-DLCL2 ( FIG. 5A ), SU-DHL-8 ( FIG. 5B ), or Naml-6 ( FIG. 5C ), whereas the combination of urelumab with obinutuzumab does not. 
         FIG. 6  shows the protocol of the in vivo efficacy study of the monovalent hybrid CD19-4-1BBL molecule (mono CD19-mu4-1BBL) in combination with rituximab in huCD16Tg Scid mice. In the table below the subgroups of mice receiving different combinations and doses are defined. The experiment is described in Example 4 and the results are shown in  FIG. 7A  and  FIG. 7B . The combination of mono CD19-mu4-1BBL in combination with rituximab did induce stronger and faster tumor growth inhibition as compared to monotherapy with rituximab or monotherapy with mono CD19-mu4-1BBL in all doses tested. As shown in  FIG. 7B , the tumor weights at study termination confirmed these findings. 
         FIG. 8  shows the protocol of the in vivo efficacy study of the monovalent CD19 (2B11)-4-1BBL construct in combination with obinutuzumab (Gazyva) in WSU-DLCL2-bearing fully humanized NSG mice. In the table below the subgroups of mice receiving different combinations and doses are defined. The experiment is described in Example 5 and the results are shown in  FIG. 9 . The combination of mono CD19 (2B11)-4-1BBL with Gazyva induced much stronger tumor growth inhibition as compared to monotherapy with Gazyva. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Definitions 
     Unless defined otherwise, technical and scientific terms used herein have the same meaning as generally used in the art to which this invention belongs. For purposes of interpreting this specification, the following definitions will apply and whenever appropriate, terms used in the singular will also include the plural and vice versa. 
     As used herein, the term “antigen binding molecule” refers in its broadest sense to a molecule that specifically binds an antigenic determinant. Examples of antigen binding molecules are antibodies, antibody fragments and scaffold antigen binding proteins. 
     The term “antibody” herein is used in the broadest sense and encompasses various antibody structures, including but not limited to monoclonal antibodies, polyclonal antibodies, monospecific and multispecific antibodies (e.g., bispecific antibodies), and antibody fragments so long as they exhibit the desired antigen-binding activity. 
     The term “monoclonal antibody” as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e., the individual antibodies comprising the population are identical and/or bind the same epitope, except for possible variant antibodies, e.g. containing naturally occurring mutations or arising during production of a monoclonal antibody preparation, such variants generally being present in minor amounts. In contrast to polyclonal antibody preparations, which typically include different antibodies directed against different determinants (epitopes), each monoclonal antibody of a monoclonal antibody preparation is directed against a single determinant on an antigen. 
     The term “monospecific” antibody as used herein denotes an antibody that has one or more binding sites each of which bind to the same epitope of the same antigen. The term “bispecific” means that the antigen binding molecule is able to specifically bind to at least two distinct antigenic determinants. Typically, a bispecific antigen binding molecule comprises two antigen binding sites, each of which is specific for a different antigenic determinant. In certain embodiments the bispecific antigen binding molecule is capable of simultaneously binding two antigenic determinants, particularly two antigenic determinants expressed on two distinct cells. 
     The term “valent” as used within the current application denotes the presence of a specified number of binding sites in an antigen binding molecule. As such, the terms “bivalent”, “tetravalent”, and “hexavalent” denote the presence of two binding sites, four binding sites, and six binding sites, respectively, in an antigen binding molecule. “Monovalent” denotes the presence of only one binding domain for a particular target in the antigen binding molecule. 
     The terms “full length antibody”, “intact antibody”, and “whole antibody” are used herein interchangeably to refer to an antibody having a structure substantially similar to a native antibody structure. “Native antibodies” refer to naturally occurring immunoglobulin molecules with varying structures. For example, native IgG-class antibodies are heterotetrameric glycoproteins of about 150,000 daltons, composed of two light chains and two heavy chains that are disulfide-bonded. From N- to C-terminus, each heavy chain has a variable region (VH), also called a variable heavy domain or a heavy chain variable domain, followed by three constant domains (CH1, CH2, and CH3), also called a heavy chain constant region. Similarly, from N- to C-terminus, each light chain has a variable region (VL), also called a variable light domain or a light chain variable domain, followed by a light chain constant domain (CL), also called a light chain constant region. The heavy chain of an antibody may be assigned to one of five types, called α (IgA), δ (IgD), ε (IgE), γ (IgG), or μ (IgM), some of which may be further divided into subtypes, e.g. γ1 (IgG1), γ2 (IgG2), γ3 (IgG3), γ4 (IgG4), α1 (IgA1) and α2 (IgA2). The light chain of an antibody may be assigned to one of two types, called kappa (κ) and lambda (λ), based on the amino acid sequence of its constant domain. 
     An “antibody fragment” refers to a molecule other than an intact antibody that comprises a portion of an intact antibody that binds the antigen to which the intact antibody binds. Examples of antibody fragments include but are not limited to Fv, Fab, Fab′, Fab′-SH, F(ab′) 2 ; diabodies, triabodies, tetrabodies, cross-Fab fragments; linear antibodies; single-chain antibody molecules (e.g. scFv); and single domain antibodies. For a review of certain antibody fragments, see Hudson et al., Nat Med 9, 129-134 (2003). For a review of scFv fragments, see e.g. Plückthun, in The Pharmacology of Monoclonal Antibodies, vol. 113, Rosenburg and Moore eds., Springer-Verlag, New York, pp. 269-315 (1994); see also WO 93/16185; and U.S. Pat. Nos. 5,571,894 and 5,587,458. For discussion of Fab and F(ab′)2 fragments comprising salvage receptor binding epitope residues and having increased in vivo half-life, see U.S. Pat. No. 5,869,046. Diabodies are antibody fragments with two antigen-binding sites that may be bivalent or bispecific, see, for example, EP 404,097; WO 1993/01161; Hudson et al., Nat Med 9, 129-134 (2003); and Hollinger et al., Proc Natl Acad Sci USA 90, 6444-6448 (1993). Triabodies and tetrabodies are also described in Hudson et al., Nat Med 9, 129-134 (2003). Single-domain antibodies are antibody fragments comprising all or a portion of the heavy chain variable domain or all or a portion of the light chain variable domain of an antibody. In certain embodiments, a single-domain antibody is a human single-domain antibody (Domantis, Inc., Waltham, Mass.; see e.g. U.S. Pat. No. 6,248,516 B1). Antibody fragments can be made by various techniques, including but not limited to proteolytic digestion of an intact antibody as well as production by recombinant host cells (e.g.  E. coli  or phage), as described herein. 
     Papain digestion of intact antibodies produces two identical antigen-binding fragments, called “Fab” fragments containing each the heavy- and light-chain variable domains and also the constant domain of the light chain and the first constant domain (CH1) of the heavy chain. As used herein, Thus, the term “Fab fragment” refers to an antibody fragment comprising a light chain fragment comprising a VL domain and a constant domain of a light chain (CL), and a VH domain and a first constant domain (CH1) of a heavy chain. Fab′ fragments differ from Fab fragments by the addition of a few residues at the carboxy terminus of the heavy chain CH1 domain including one or more cysteins from the antibody hinge region. Fab′-SH are Fab′ fragments in which the cysteine residue(s) of the constant domains bear a free thiol group. Pepsin treatment yields an F(ab′) 2  fragment that has two antigen-combining sites (two Fab fragments) and a part of the Fc region. 
     The term “cross-Fab fragment” or “xFab fragment” or “crossover Fab fragment” refers to a Fab fragment, wherein either the variable regions or the constant regions of the heavy and light chain are exchanged. Two different chain compositions of a crossover Fab molecule are possible and comprised in the bispecific antibodies of the invention: On the one hand, the variable regions of the Fab heavy and light chain are exchanged, i.e. the crossover Fab molecule comprises a peptide chain composed of the light chain variable region (VL) and the heavy chain constant region (CH1), and a peptide chain composed of the heavy chain variable region (VH) and the light chain constant region (CL). This crossover Fab molecule is also referred to as CrossFab (VLVH) . On the other hand, when the constant regions of the Fab heavy and light chain are exchanged, the crossover Fab molecule comprises a peptide chain composed of the heavy chain variable region (VH) and the light chain constant region (CL), and a peptide chain composed of the light chain variable region (VL) and the heavy chain constant region (CH1). This crossover Fab molecule is also referred to as CrossFab (CLCH1) . 
     A “single chain Fab fragment” or “scFab” is a polypeptide consisting of an antibody heavy chain variable domain (VH), an antibody constant domain 1 (CH1), an antibody light chain variable domain (VL), an antibody light chain constant domain (CL) and a linker, wherein said antibody domains and said linker have one of the following orders in N-terminal to C-terminal direction: a) VH-CH1-linker-VL-CL, b) VL-CL-linker-VH-CH1, c) VH-CL-linker-VL-CH1 or d) VL-CH1-linker-VH-CL; and wherein said linker is a polypeptide of at least 30 amino acids, preferably between 32 and 50 amino acids. Said single chain Fab fragments are stabilized via the natural disulfide bond between the CL domain and the CH1 domain. In addition, these single chain Fab molecules might be further stabilized by generation of interchain disulfide bonds via insertion of cysteine residues (e.g. position 44 in the variable heavy chain and position 100 in the variable light chain according to Kabat numbering). 
     A “crossover single chain Fab fragment” or “x-scFab” is a is a polypeptide consisting of an antibody heavy chain variable domain (VH), an antibody constant domain 1 (CH1), an antibody light chain variable domain (VL), an antibody light chain constant domain (CL) and a linker, wherein said antibody domains and said linker have one of the following orders in N-terminal to C-terminal direction: a) VH-CL-linker-VL-CH1 and b) VL-CH1-linker-VH-CL; wherein VH and VL form together an antigen-binding site which binds specifically to an antigen and wherein said linker is a polypeptide of at least 30 amino acids. In addition, these x-scFab molecules might be further stabilized by generation of interchain disulfide bonds via insertion of cysteine residues (e.g. position 44 in the variable heavy chain and position 100 in the variable light chain according to Kabat numbering). 
     A “single-chain variable fragment (scFv)” is a fusion protein of the variable regions of the heavy (V H ) and light chains (V L ) of an antibody, connected with a short linker peptide of ten to about 25 amino acids. The linker is usually rich in glycine for flexibility, as well as serine or threonine for solubility, and can either connect the N-terminus of the V H  with the C-terminus of the V L , or vice versa. This protein retains the specificity of the original antibody, despite removal of the constant regions and the introduction of the linker. scFv antibodies are, e.g. described in Houston, J. S., Methods in Enzymol. 203 (1991) 46-96). In addition, antibody fragments comprise single chain polypeptides having the characteristics of a VH domain, namely being able to assemble together with a VL domain, or of a VL domain, namely being able to assemble together with a VH domain to a functional antigen binding site and thereby providing the antigen binding property of full length antibodies. 
     “Scaffold antigen binding proteins” are known in the art, for example, fibronectin and designed ankyrin repeat proteins (DARPins) have been used as alternative scaffolds for antigen-binding domains, see, e.g., Gebauer and Skerra, Engineered protein scaffolds as next-generation antibody therapeutics. Curr Opin Chem Biol 13:245-255 (2009) and Stumpp et al., Darpins: A new generation of protein therapeutics. Drug Discovery Today 13: 695-701 (2008). In one aspect of the invention, a scaffold antigen binding protein is selected from the group consisting of CTLA-4 (Evibody), Lipocalins (Anticalin), a Protein A-derived molecule such as Z-domain of Protein A (Affibody), an A-domain (Avimer/Maxibody), a serum transferrin (trans-body); a designed ankyrin repeat protein (DARPin), a variable domain of antibody light chain or heavy chain (single-domain antibody, sdAb), a variable domain of antibody heavy chain (nanobody, aVH), V NAR  fragments, a fibronectin (AdNectin), a C-type lectin domain (Tetranectin); a variable domain of a new antigen receptor beta-lactamase (VNAR fragments), a human gamma-crystallin or ubiquitin (Affilin molecules); a kunitz type domain of human protease inhibitors, microbodies such as the proteins from the knottin family, peptide aptamers and fibronectin (adnectin). 
     Lipocalins are a family of extracellular proteins which transport small hydrophobic molecules such as steroids, bilins, retinoids and lipids. They have a rigid beta-sheet secondary structure with a number of loops at the open end of the conical structure which can be engineered to bind to different target antigens. Anticalins are between 160-180 amino acids in size, and are derived from lipocalins. For further details see Biochim Biophys Acta 1482: 337-350 (2000), US7250297B1 and US20070224633. 
     Designed Ankyrin Repeat Proteins (DARPins) are derived from Ankyrin which is a family of proteins that mediate attachment of integral membrane proteins to the cytoskeleton. A single ankyrin repeat is a 33 residue motif consisting of two alpha-helices and a beta-turn. They can be engineered to bind different target antigens by randomizing residues in the first alpha-helix and a beta-turn of each repeat. Their binding interface can be increased by increasing the number of modules (a method of affinity maturation). For further details see J. Mol. Biol. 332, 489-503 (2003), PNAS 100(4), 1700-1705 (2003) and J. Mol. Biol. 369, 1015-1028 (2007) and US20040132028A1. 
     A single-domain antibody is an antibody fragment consisting of a single monomeric variable antibody domain. The first single domains were derived from the variable domain of the antibody heavy chain from camelids (nanobodies or V H H fragments). Furthermore, the term single-domain antibody includes an autonomous human heavy chain variable domain (aVH) or V NAR  fragments derived from sharks. 
     An “antigen binding molecule that binds to the same epitope” as a reference molecule refers to an antigen binding molecule that blocks binding of the reference molecule to its antigen in a competition assay by 50% or more, and conversely, the reference molecule blocks binding of the antigen binding molecule to its antigen in a competition assay by 50% or more. 
     The term “antigen binding domain” refers to the part of an antigen binding molecule that comprises the area which specifically binds to and is complementary to part or all of an antigen. Where an antigen is large, an antigen binding molecule may only bind to a particular part of the antigen, which part is termed an epitope. An antigen binding domain may be provided by, for example, one or more variable domains (also called variable regions). Preferably, an antigen binding domain comprises an antibody light chain variable region (VL) and an antibody heavy chain variable region (VH). 
     As used herein, the term “antigenic determinant” is synonymous with “antigen” and “epitope,” and refers to a site (e.g. a contiguous stretch of amino acids or a conformational configuration made up of different regions of non-contiguous amino acids) on a polypeptide macromolecule to which an antigen binding moiety binds, forming an antigen binding moiety-antigen complex. Useful antigenic determinants can be found, for example, on the surfaces of tumor cells, on the surfaces of virus-infected cells, on the surfaces of other diseased cells, on the surface of immune cells, free in blood serum, and/or in the extracellular matrix (ECM). The proteins useful as antigens herein can be any native form the proteins from any vertebrate source, including mammals such as primates (e.g. humans) and rodents (e.g. mice and rats), unless otherwise indicated. In a particular embodiment the antigen is a human protein. Where reference is made to a specific protein herein, the term encompasses the “full-length”, unprocessed protein as well as any form of the protein that results from processing in the cell. The term also encompasses naturally occurring variants of the protein, e.g. splice variants or allelic variants. 
     By “specific binding” is meant that the binding is selective for the antigen and can be discriminated from unwanted or non-specific interactions. The ability of an antigen binding molecule to bind to a specific antigen can be measured either through an enzyme-linked immunosorbent assay (ELISA) or other techniques familiar to one of skill in the art, e.g. Surface Plasmon Resonance (SPR) technique (analyzed on a BIAcore instrument) (Liljeblad et al., Glyco J 17, 323-329 (2000)), and traditional binding assays (Heeley, Endocr Res 28, 217-229 (2002)). In one embodiment, the extent of binding of an antigen binding molecule to an unrelated protein is less than about 10% of the binding of the antigen binding molecule to the antigen as measured, e.g. by SPR. In certain embodiments, a molecule that binds to the antigen has a dissociation constant (Kd) of ≤1 μM, ≤100 nM, ≤10 nM, ≤1 nM, ≤0.1 nM, ≤0.01 nM, or ≤0.001 nM (e.g. 10 −8  M or less, e.g. from 10 −8  M to 10 −13  M, e.g. from 10 −9  M to 10 −13  M). 
     “Affinity” or “binding affinity” refers to the strength of the sum total of non-covalent interactions between a single binding site of a molecule (e.g. an antibody) and its binding partner (e.g. an antigen). Unless indicated otherwise, as used herein, “binding affinity” refers to intrinsic binding affinity which reflects a 1:1 interaction between members of a binding pair (e.g. antibody and antigen). The affinity of a molecule X for its partner Y can generally be represented by the dissociation constant (Kd), which is the ratio of dissociation and association rate constants (k off  and k on , respectively). Thus, equivalent affinities may comprise different rate constants, as long as the ratio of the rate constants remains the same. Affinity can be measured by common methods known in the art, including those described herein. A particular method for measuring affinity is Surface Plasmon Resonance (SPR). 
     A “B-cell antigen” as used herein refers to an antigenic determinant presented on the surface of a B lymphocyte, particularly a malignant B lymphocyte (in that case the antigen also being referred to as “malignant B-cell antigen”). 
     The term “tumor-associated antigen” means any antigen that is highly expressed by tumor cells or in the tumor stroma. Particular tumor-associated antigens are CD19 or FAP. 
     The term “CD19” refers to B-lymphocyte antigen CD19, also known as B-lymphocyte surface antigen B4 or T-cell surface antigen Leu-12 and includes any native CD19 from any vertebrate source, including mammals such as primates (e.g. humans) non-human primates (e.g. cynomolgus monkeys) and rodents (e.g. mice and rats), unless otherwise indicated. The amino acid sequence of human CD19 is shown in Uniprot accession no. P15391 (version 160, SEQ ID NO:62). The term encompasses “full-length” unprocessed human CD19 as well as any form of human CD19 that results from processing in the cell as long as the antibody as reported herein binds thereto. CD19 is a structurally distinct cell surface receptor expressed on the surface of human B cells, including, but not limited to, pre-B cells, B cells in early development {i.e., immature B cells), mature B cells through terminal differentiation into plasma cells, and malignant B cells. CD19 is expressed by most pre-B acute lymphoblastic leukemias (ALL), non-Hodgkin&#39;s lymphomas, B cell chronic lymphocytic leukemias (CLL), pro-lymphocytic leukemias, hairy cell leukemias, common acute lymphocytic leukemias, and some Null-acute lymphoblastic leukemias. The expression of CD19 on plasma cells further suggests it may be expressed on differentiated B cell tumors such as multiple myeloma. Therefore, the CD19 antigen is a target for immunotherapy in the treatment of non-Hodgkin&#39;s lymphoma, chronic lymphocytic leukemia and/or acute lymphoblastic leukemia. 
     “CD20” refers to B-lymphocyte antigen CD20, also known as B-lymphocyte surface antigen B1 or Leukocyte surface antigen Leu-16, and includes any native CD20 from any vertebrate source, including mammals such as primates (e.g. humans) non-human primates (e.g. cynomolgus monkeys) and rodents (e.g. mice and rats), unless otherwise indicated. The amino acid sequence of human CD20 is shown in Uniprot accession no. P11836 (version 149, SEQ ID NO:63). CD20 is a hydrophobic transmembrane protein with a molecular weight of approximately 35 kD expressed on pre-B and mature B lymphocytes. The corresponding human gene is membrane-spanning 4-domains, subfamily A, member 1, also known as MS4A1. This gene encodes a member of the membrane-spanning 4A gene family. Members of this nascent protein family are characterized by common structural features and similar intron/exon splice boundaries and display unique expression patterns among hematopoietic cells and nonlymphoid tissues. This gene encodes the B-lymphocyte surface molecule which plays a role in the development and differentiation of B-cells into plasma cells. This family member is localized to 11q12, among a cluster of family members. Alternative splicing of this gene results in two transcript variants which encode the same protein. The term “CD20” encompasses “full-length,” unprocessed CD20 as well as any form of CD20 that results from processing in the cell. The term also encompasses naturally occurring variants of CD20, e.g., splice variants or allelic variants. 
     The terms “anti-CD20 antibody” and “an antibody that binds to CD20” refer to an antibody that is capable of binding CD20 with sufficient affinity such that the antibody is useful as a diagnostic and/or therapeutic agent in targeting CD20. In one embodiment, the extent of binding of an anti-CD20 antibody to an unrelated, non-CD20 protein is less than about 10% of the binding of the antibody to CD20 as measured, e.g., by a radioimmunoassay (RIA). In certain embodiments, an antibody that binds to CD20 has a dissociation constant (Kd) of ≤1 μM, ≤100 nM, ≤10 nM, ≤1 nM, ≤0.1 nM, ≤0.01 nM, or ≤0.001 nM (e.g. 10 −8  M or less, e.g. from 10 −8  M to 10 −13  M, e.g., from 10 −9  M to 10 −13  M). In certain embodiments, an anti-CD20 antibody binds to an epitope of CD20 that is conserved among CD20 from different species. 
     By “Type II anti-CD20 antibody” is meant an anti-CD20 antibody having binding properties and biological activities of Type II anti-CD20 antibodies as described in Cragg et al., Blood 103 (2004) 2738-2743; Cragg et al., Blood 101 (2003) 1045-1052, Klein et al., mAbs 5 (2013), 22-33, and summarized in Table 1 below. 
     
       
         
           
               
             
               
                 TABLE A 
               
             
            
               
                   
               
               
                 Properties of type I and type II anti-CD20 antibodies 
               
            
           
           
               
               
            
               
                 type I anti-CD20 antibodies 
                 type II anti-CD20 antibodies 
               
               
                   
               
               
                 Bind class I CD20 epitope 
                 Bind class II CD20 epitope 
               
               
                 Localize CD20 to lipid rafts 
                 Do not localize CD20 to lipid rafts 
               
               
                 High CDC * 
                 Low CDC * 
               
               
                 ADCC activity * 
                 ADCC activity * 
               
               
                 Full binding capacity&#39; to B cells 
                 Approx. half binding capacity to B 
               
               
                   
                 cells 
               
               
                 Weak homotypic aggregation 
                 Homotypic aggregation 
               
               
                 Low cell death induction 
                 Strong cell death induction 
               
               
                   
               
               
                 * if IgG 1  isotype 
               
            
           
         
       
     
     Examples of type II anti-CD20 antibodies include e.g. obinutuzumab (GA101), tositumumab (B1), humanized B-Ly1 antibody IgG1 (a chimeric humanized IgG1 antibody as disclosed in WO 2005/044859), 11B8 IgG1 (as disclosed in WO 2004/035607) and AT80 IgG1. 
     In one aspect, the Type II anti-CD20 antibody comprises the heavy chain variable region sequence (V H CD20) comprising the HCDR1 of SEQ ID NO:73, the HCDR2 of SEQ ID NO:74, and the HCDR3 of SEQ ID NO:75 and the light chain variable region sequence (V L CD20) comprising the LCDR1 of SEQ ID NO:76, the LCDR2 of SEQ ID NO:77, and the LCDR3 of SEQ ID NO:78. In another aspect, the Type II anti-CD20 antibody is engineered to have an increased proportion of non-fucosylated oligosaccharides in the Fc region as compared to a non-engineered antibody. In one aspect, at least about 40% of the N-linked oligosaccharides in the Fc region of the Type II anti-CD20 antibody are non-fucosylated. 
     In a particular aspect, the Type II anti-CD20 antibody is obinutuzumab (recommended INN, WHO Drug Information, Vol. 26, No. 4, 2012, p. 453). As used herein, obinutuzumab is synonymous for GA101. The tradename is GAZYVA® or GAZYVARO®. This replaces all previous versions (e.g. Vol. 25, No. 1, 2011, p.75-76), and is formerly known as afutuzumab (recommended INN, WHO Drug Information, Vol. 23, No. 2, 2009, p. 176; Vol. 22, No. 2, 2008, p. 124). In one embodiment, the Type II anti-CD20 antibody comprises the heavy chain variable region sequence of SEQ ID NO:79 and the light chain variable region sequence of SEQ ID NO: 80. In one aspect, the Type II anti-CD20 antibody is tositumomab. 
     By “Type I anti-CD20 antibody” is meant an anti-CD20 antibody selected from the group consisting of rituximab, ofatumumab, veltuzumab, ocaratuzumab, ocrelizumab, PRO131921, ublituximab, HI47 IgG3 (ECACC, hybridoma), 2C6 IgG1 (as disclosed in WO 2005/103081), 2F2 IgG1 (as disclosed in WO 2004/035607 and WO 2005/103081) and 2H7 IgG1 (as disclosed in WO 2004/056312). A particular Type I anti-CD20 antibody is rituximab. 
     “Rituximab” is a genetically engineered chimeric human gamma 1 murine constant domain containing monoclonal antibody directed against the human CD20 antigen. This chimeric antibody contains human gamma 1 constant domains and is identified by the name “C2B8” in U.S. Pat. No. 5,736,137 (Andersen et. al.) issued on Apr. 17, 1998, assigned to IDEC Pharmaceuticals Corporation. Rituximab is approved for the treatment of patients with relapsed or refracting low-grade or follicular, CD20 positive, B cell non-Hodgkin&#39;s lymphoma. In vitro mechanism of action studies have shown that rituximab exhibits human complement-dependent cytotoxicity (CDC) (Reff, M. E., et. al., Blood 83 (1994) 435-445). Additionally, it exhibits significant activity in assays that measure antibody-dependent cellular cytotoxicity (ADCC). Rituximab is not afucosylated. 
     The term “humanized B-Ly1 antibody” refers to humanized B-Ly1 antibody as disclosed in WO 2005/044859 and WO 2007/031875, which were obtained from the murine monoclonal anti-CD20 antibody B-Ly1 (variable region of the murine heavy chain (VH): SEQ ID NO:64; variable region of the murine light chain (VL): SEQ ID NO:65 (see Poppema, S. and Visser, L., Biotest Bulletin 3 (1987) 131-139) by chimerization with a human constant domain from IgG1 and following humanization (see WO 2005/044859 and WO 2007/031875). These “humanized B-Ly1 antibodies” are disclosed in detail in WO 2005/044859 and WO 2007/031875. 
     The term “Fibroblast activation protein (FAP)”, also known as Prolyl endopeptidase FAP or Seprase (EC 3.4.21), refers to any native FAP from any vertebrate source, including mammals such as primates (e.g. humans) non-human primates (e.g. cynomolgus monkeys) and rodents (e.g. mice and rats), unless otherwise indicated. The term encompasses “full-length,” unprocessed FAP as well as any form of FAP which results from processing in the cell. The term also encompasses naturally occurring variants of FAP, e.g., splice variants or allelic variants. In one embodiment, the antigen binding molecule of the invention is capable of specific binding to human, mouse and/or cynomolgus FAP. The amino acid sequence of human FAP is shown in UniProt (www.uniprot.org) accession no. Q12884 (version 149, SEQ ID NO:120), or NCBI (www.ncbi.nlm.nih.gov/) RefSeq NP_004451.2. The extracellular domain (ECD) of human FAP extends from amino acid position 26 to 760. The amino acid sequence of a His-tagged human FAP ECD is shown in SEQ ID NO: 121. The amino acid sequence of mouse FAP is shown in UniProt accession no. P97321 (version 126, SEQ ID NO:122), or NCBI RefSeq NP_032012.1. The extracellular domain (ECD) of mouse FAP extends from amino acid position 26 to 761. SEQ ID NO: 123 shows the amino acid sequence of a His-tagged mouse FAP ECD. SEQ ID NO: 124 shows the amino acid sequence of a His-tagged cynomolgus FAP ECD. Preferably, an anti-FAP binding molecule of the invention binds to the extracellular domain of FAP. Exemplary anti-FAP binding molecules are described in International Patent Application No. WO 2012/020006 A2. 
     The term “reduction” (and grammatical variations thereof such as “reduce” or “reducing”), for example reduction of the number of B cells or cytokine release, refers to a decrease in the respective quantity, as measured by appropriate methods known in the art. For clarity the term includes also reduction to zero (or below the detection limit of the analytical method), i.e. complete abolishment or elimination. Conversely, “increased” refers to an increase in the respective quantity. 
     A “T-cell antigen” as used herein refers to an antigenic determinant presented on the surface of a T lymphocyte, particularly a cytotoxic T lymphocyte. 
     A “T cell activating therapeutic agent” as used herein refers to a therapeutic agent capable of inducing T cell activation in a subject, particularly a therapeutic agent designed for inducing T-cell activation in a subject. Examples of T cell activating therapeutic agents include bispecific antibodies that specifically bind an activating T cell antigen, such as CD3, and a target cell antigen, such as CD20 or CD19. Further examples include chimeric antigen receptors (CARs) which comprise a T cell activating domain and an antigen binding moiety that specifically binds to a target cell antigen, such as CD20 or CD19. 
     An “activating T cell antigen” as used herein refers to an antigenic determinant expressed by a T lymphocyte, particularly a cytotoxic T lymphocyte, which is capable of inducing or enhancing T cell activation upon interaction with an antigen binding molecule. Specifically, interaction of an antigen binding molecule with an activating T cell antigen may induce T cell activation by triggering the signaling cascade of the T cell receptor complex. An exemplary activating T cell antigen is CD3. 
     The term “variable region” or “variable domain” refers to the domain of an antibody heavy or light chain that is involved in binding the antigen binding molecule to antigen. The variable domains of the heavy chain and light chain (VH and VL, respectively) of a native antibody generally have similar structures, with each domain comprising four conserved framework regions (FRs) and three hypervariable regions (HVRs). See, e.g., Kindt et al., Kuby Immunology, 6th ed., W.H. Freeman and Co., page 91 (2007). A single VH or VL domain may be sufficient to confer antigen-binding specificity. 
     The term “hypervariable region” or “HVR,” as used herein refers to each of the regions of an antibody variable domain which are hypervariable in sequence and/or form structurally defined loops (“hypervariable loops”). Generally, native four-chain antibodies comprise six HVRs; three in the VH (H1, H2, H3), and three in the VL (L1, L2, L3). HVRs generally comprise amino acid residues from the hypervariable loops and/or from the “complementarity determining regions” (CDRs), the latter being of highest sequence variability and/or involved in antigen recognition. Exemplary hypervariable loops occur at amino acid residues 26-32 (L1), 50-52 (L2), 91-96 (L3), 26-32 (H1), 53-55 (H2), and 96-101 (H3). (Chothia and Lesk,  J. Mol. Biol.  196:901-917 (1987).) Exemplary CDRs (CDR-L1, CDR-L2, CDR-L3, CDR-H1, CDR-H2, and CDR-H3) occur at amino acid residues 24-34 of L1, 50-56 of L2, 89-97 of L3, 31-35B of H1, 50-65 of H2, and 95-102 of H3. (Kabat et al.,  Sequences of Proteins of Immunological Interest,  5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991).) Hypervariable regions (HVRs) are also referred to as complementarity determining regions (CDRs), and these terms are used herein interchangeably in reference to portions of the variable region that form the antigen binding regions. This particular region has been described by Kabat et al., U.S. Dept. of Health and Human Services, “Sequences of Proteins of Immunological Interest” (1983) and by Chothia et al.,  J. Mol. Biol.  196:901-917 (1987), where the definitions include overlapping or subsets of amino acid residues when compared against each other. Nevertheless, application of either definition to refer to a CDR of an antibody or variants thereof is intended to be within the scope of the term as defined and used herein. The appropriate amino acid residues which encompass the CDRs as defined by each of the above cited references are set forth below in Table B as a comparison. The exact residue numbers which encompass a particular CDR will vary depending on the sequence and size of the CDR. Those skilled in the art can routinely determine which residues comprise a particular CDR given the variable region amino acid sequence of the antibody. 
     
       
         
           
               
             
               
                 TABLE B 
               
             
            
               
                   
               
               
                 CDR Definitions 1   
               
            
           
           
               
               
               
               
               
            
               
                   
                 CDR 
                 Kabat 
                 Chothia 
                 AbM 2   
               
               
                   
                   
               
               
                   
                 V H  CDR1 
                 31-35 
                 26-32 
                 26-35 
               
               
                   
                 V H  CDR2 
                 50-65 
                 52-58 
                 50-58 
               
               
                   
                 V H  CDR3 
                  95-102 
                  95-102 
                  95-102 
               
               
                   
                 V L  CDR1 
                 24-34 
                 26-32 
                 24-34 
               
               
                   
                 V L  CDR2 
                 50-56 
                 50-52 
                 50-56 
               
               
                   
                 V L  CDR3 
                 89-97 
                 91-96 
                 89-97 
               
               
                   
                   
               
               
                   
                   1 Numbering of all CDR definitions in Table A is according to the numbering conventions set forth by Kabat et al. (see below). 
               
               
                   
                   2 “AbM” with a lowercase “b” as used in Table A refers to the CDRs as defined by Oxford Molecular&#39;s “AbM” antibody modeling software. 
               
            
           
         
       
     
     Kabat et al. also defined a numbering system for variable region sequences that is applicable to any antibody. One of ordinary skill in the art can unambiguously assign this system of “Kabat numbering” to any variable region sequence, without reliance on any experimental data beyond the sequence itself. As used herein, “Kabat numbering” refers to the numbering system set forth by Kabat et al., U.S. Dept. of Health and Human Services, “Sequence of Proteins of Immunological Interest” (1983). Unless otherwise specified, references to the numbering of specific amino acid residue positions in an antibody variable region are according to the Kabat numbering system. 
     With the exception of CDR1 in VH, CDRs generally comprise the amino acid residues that form the hypervariable loops. CDRs also comprise “specificity determining residues,” or “SDRs,” which are residues that contact antigen. SDRs are contained within regions of the CDRs called abbreviated-CDRs, or a-CDRs. Exemplary a-CDRs (a-CDR-L1, a-CDR-L2, a-CDR-L3, a-CDR-H1, a-CDR-H2, and a-CDR-H3) occur at amino acid residues 31-34 of L1, 50-55 of L2, 89-96 of L3, 31-35B of H1, 50-58 of H2, and 95-102 of H3. (See Almagro and Fransson,  Front. Biosci.  13:1619-1633 (2008).) Unless otherwise indicated, HVR residues and other residues in the variable domain (e.g., FR residues) are numbered herein according to Kabat et al., supra. 
     As used herein, the term “affinity matured” in the context of antigen binding molecules (e.g., antibodies) refers to an antigen binding molecule that is derived from a reference antigen binding molecule, e.g., by mutation, binds to the same antigen, preferably binds to the same epitope, as the reference antibody; and has a higher affinity for the antigen than that of the reference antigen binding molecule. Affinity maturation generally involves modification of one or more amino acid residues in one or more CDRs of the antigen binding molecule. Typically, the affinity matured antigen binding molecule binds to the same epitope as the initial reference antigen binding molecule. 
     “Framework” or “FR” refers to variable domain residues other than hypervariable region (HVR) residues. The FR of a variable domain generally consists of four FR domains: FR1, FR2, FR3, and FR4. Accordingly, the HVR and FR sequences generally appear in the following sequence in VH (or VL): FR1-H1(L1)-FR2-H2(L2)-FR3-H3(L3)-FR4. 
     An “acceptor human framework” for the purposes herein is a framework comprising the amino acid sequence of a light chain variable domain (VL) framework or a heavy chain variable domain (VH) framework derived from a human immunoglobulin framework or a human consensus framework, as defined below. An acceptor human framework “derived from” a human immunoglobulin framework or a human consensus framework may comprise the same amino acid sequence thereof, or it may contain amino acid sequence changes. In some embodiments, the number of amino acid changes are 10 or less, 9 or less, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less, 3 or less, or 2 or less. In some embodiments, the VL acceptor human framework is identical in sequence to the VL human immunoglobulin framework sequence or human consensus framework sequence. 
     The term “chimeric” antibody refers to an antibody in which a portion of the heavy and/or light chain is derived from a particular source or species, while the remainder of the heavy and/or light chain is derived from a different source or species. 
     The “class” of an antibody refers to the type of constant domain or constant region possessed by its heavy chain. There are five major classes of antibodies: IgA, IgD, IgE, IgG, and IgM, and several of these may be further divided into subclasses (isotypes), e.g. IgG 1 , IgG 2 , IgG 3 , IgG 4 , IgA 1 , and IgA 2 . The heavy chain constant domains that correspond to the different classes of immunoglobulins are called α, δ, ε, γ, and μ respectively. 
     A “humanized” antibody refers to a chimeric antibody comprising amino acid residues from non-human HVRs and amino acid residues from human FRs. In certain embodiments, a humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the HVRs (e.g., CDRs) correspond to those of a non-human antibody, and all or substantially all of the FRs correspond to those of a human antibody. A humanized antibody optionally may comprise at least a portion of an antibody constant region derived from a human antibody. A “humanized form” of an antibody, e.g., a non-human antibody, refers to an antibody that has undergone humanization. Other forms of “humanized antibodies” encompassed by the present invention are those in which the constant region has been additionally modified or changed from that of the original antibody to generate the properties according to the invention, especially in regard to C1q binding and/or Fc receptor (FcR) binding. 
     A “human” antibody is one which possesses an amino acid sequence which corresponds to that of an antibody produced by a human or a human cell or derived from a non-human source that utilizes human antibody repertoires or other human antibody-encoding sequences. This definition of a human antibody specifically excludes a humanized antibody comprising non-human antigen-binding residues. 
     The term “Fc domain” or “Fc region” herein is used to define a C-terminal region of an antibody heavy chain that contains at least a portion of the constant region. The term includes native sequence Fc regions and variant Fc regions. An IgG Fc region comprises an IgG CH2 and an IgG CH3 domain. The “CH2 domain” of a human IgG Fc region usually extends from an amino acid residue at about position 231 to an amino acid residue at about position 340. In one embodiment, a carbohydrate chain is attached to the CH2 domain. The CH2 domain herein may be a native sequence CH2 domain or variant CH2 domain. The “CH3 domain” comprises the stretch of residues C-terminal to a CH2 domain in an Fc region (i.e. from an amino acid residue at about position 341 to an amino acid residue at about position 447 of an IgG). The CH3 region herein may be a native sequence CH3 domain or a variant CH3 domain (e.g. a CH3 domain with an introduced “protuberance” (“knob”) in one chain thereof and a corresponding introduced “cavity” (“hole”) in the other chain thereof; see U.S. Pat. No. 5,821,333, expressly incorporated herein by reference). Such variant CH3 domains may be used to promote heterodimerization of two non-identical antibody heavy chains as herein described. In one embodiment, a human IgG heavy chain Fc region extends from Cys226, or from Pro230, to the carboxyl-terminus of the heavy chain. However, the C-terminal lysine (Lys447) of the Fc region may or may not be present. Unless otherwise specified herein, numbering of amino acid residues in the Fc region or constant region is according to the EU numbering system, also called the EU index, as described in Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md., 1991. 
     The “knob-into-hole” technology is described e.g. in U.S. Pat. Nos. 5,731,168; 7,695,936; Ridgway et al., Prot Eng 9, 617-621 (1996) and Carter, J Immunol Meth 248, 7-15 (2001). Generally, the method involves introducing a protuberance (“knob”) at the interface of a first polypeptide and a corresponding cavity (“hole”) in the interface of a second polypeptide, such that the protuberance can be positioned in the cavity so as to promote heterodimer formation and hinder homodimer formation. Protuberances are constructed by replacing small amino acid side chains from the interface of the first polypeptide with larger side chains (e.g. tyrosine or tryptophan). Compensatory cavities of identical or similar size to the protuberances are created in the interface of the second polypeptide by replacing large amino acid side chains with smaller ones (e.g. alanine or threonine). The protuberance and cavity can be made by altering the nucleic acid encoding the polypeptides, e.g. by site-specific mutagenesis, or by peptide synthesis. In a specific embodiment a knob modification comprises the amino acid substitution T366W in one of the two subunits of the Fc domain, and the hole modification comprises the amino acid substitutions T366S, L368A and Y407V in the other one of the two subunits of the Fc domain. In a further specific embodiment, the subunit of the Fc domain comprising the knob modification additionally comprises the amino acid substitution S354C, and the subunit of the Fc domain comprising the hole modification additionally comprises the amino acid substitution Y349C. Introduction of these two cysteine residues results in the formation of a disulfide bridge between the two subunits of the Fc region, thus further stabilizing the dimer (Carter, J Immunol Methods 248, 7-15 (2001)). 
     A “region equivalent to the Fc region of an immunoglobulin” is intended to include naturally occurring allelic variants of the Fc region of an immunoglobulin as well as variants having alterations which produce substitutions, additions, or deletions but which do not decrease substantially the ability of the immunoglobulin to mediate effector functions (such as antibody-dependent cellular cytotoxicity). For example, one or more amino acids can be deleted from the N-terminus or C-terminus of the Fc region of an immunoglobulin without substantial loss of biological function. Such variants can be selected according to general rules known in the art so as to have minimal effect on activity (see, e.g., Bowie, J. U. et al., Science 247:1306-10 (1990)). 
     The term “effector functions” refers to those biological activities attributable to the Fc region of an antibody, which vary with the antibody isotype. Examples of antibody effector functions include: C1q binding and complement dependent cytotoxicity (CDC), Fc receptor binding, antibody-dependent cell-mediated cytotoxicity (ADCC), antibody-dependent cellular phagocytosis (ADCP), cytokine secretion, immune complex-mediated antigen uptake by antigen presenting cells, down regulation of cell surface receptors (e.g. B cell receptor), and B cell activation. 
     An “activating Fc receptor” is an Fc receptor that following engagement by an Fc region of an antibody elicits signaling events that stimulate the receptor-bearing cell to perform effector functions. Activating Fc receptors include FcγRIIIa (CD16a), FcγRI (CD64), FcγRIIa (CD32), and FcαRI (CD89). A particular activating Fc receptor is human FcγRIIIa (see UniProt accession no. P08637, version 141). 
     As used herein, the term “effector cells” refers to a population of lymphocytes that display effector moiety receptors, e.g. cytokine receptors, and/or Fc receptors on their surface through which they bind an effector moiety, e.g. a cytokine, and/or an Fc region of an antibody and contribute to the destruction of target cells, e.g. tumor cells. Effector cells may for example mediate cytotoxic or phagocytic effects. Effector cells include, but are not limited to, effector T cells such as CD8 + cytotoxic T cells, CD4 +  helper T cells, γδ T cells, NK cells, lymphokine-activated killer (LAK) cells and macrophages/monocytes. 
     An “ectodomain” is the domain of a membrane protein that extends into the extracellular space (i.e. the space outside the target cell). Ectodomains are usually the parts of proteins that initiate contact with surfaces, which leads to signal transduction. The ectodomain of 4-1BBL as defined herein thus refers to the part of the 4-1BBL that extends into the extracellular space (the extracellular domain), but also includes shorter parts or fragments thereof that are responsible for the trimerization and for the binding to the corresponding receptor 4-1BB. The term “ectodomain of 4-1BBL or a fragment thereof” thus refers to the extracellular domain of 4-1BBL that forms the extracellular domain or to parts thereof that are still able to bind to the receptor (receptor binding domain). 
     “4-1BBL” or “4-1BB ligand” or “CD137L” is a costimulatory TNF ligand family member, which is able to costimulate proliferation and cytokine production of T-cells. Costimulatory TNF family ligands can costimulate TCR signals upon interaction with their corresponding TNF receptors and the interaction with their receptors leads to recruitment of TNFR-associated factors (TRAF), which initiate signalling cascades that result in T-cell activation. 4-1BBL is a type II transmembrane protein. Complete or full length 4-1BBL having the amino acid sequence of SEQ ID NO:66 has been described to form trimers on the surface of cells. The formation of trimers is enabled by specific motives of the ectodomain of 4-1BBL. Said motives are designated herein as “trimerization region”. The amino acids 50-254 of the human 4-1BBL sequence (SEQ ID NO:67) form the extracellular domain of 4-1BBL, but even fragments thereof are able to form the trimers. In specific embodiments of the invention, the term “ectodomain of 4-1BBL or a fragment thereof” refers to a polypeptide having an amino acid sequence selected from SEQ ID NO:4 (amino acids 52-254 of human 4-1BBL), SEQ ID NO:1 (amino acids 71-254 of human 4-1BBL), SEQ ID NO:3 (amino acids 80-254 of human 4-1BBL), SEQ ID NO:2 (amino acids 85-254 of human 4-1BBL), SEQ ID NO:5 (amino acids 71-248 of human 4-1BBL), SEQ ID NO:6 (amino acids 85-248 of human 4-1BBL), SEQ ID NO:7 (amino acids 80-248 of human 4-1BBL) and SEQ ID NO:8 (amino acids 52-248 of human 4-1BBL), but also other fragments of the ectodomain capable of trimerization are included herein. 
     The term “4-1BB” or “CD137”, as used herein, refers to any native 4-1BB from any vertebrate source, including mammals such as primates (e.g. humans) and rodents (e.g., mice and rats), unless otherwise indicated. The term encompasses “full-length,” unprocessed 4-1BB as well as any form of 4-1BB that results from processing in the cell. The term also encompasses naturally occurring variants of 4-1BB, e.g., splice variants or allelic variants. The amino acid sequence of an exemplary human 4-1BB is shown in SEQ ID NO: 68 (Uniprot accession no. Q07011), the amino acid sequence of an exemplary murine 4-1BB is shown in SEQ ID NO: 69 (Uniprot accession no. P20334) and the amino acid sequence of an exemplary cynomolgous 4-1BB (from  Macaca mulatta ) is shown in SEQ ID NO:70 (Uniprot accession no. F6W5G6). 
     The terms “anti-4-1BB antibody”, “anti-4-1BB”, “4-1BB antibody and “an antibody that specifically binds to 4-1BB” refer to an antibody that is capable of binding 4-1BB with sufficient affinity such that the antibody is useful as a diagnostic and/or therapeutic agent in targeting 4-1BB. In one embodiment, the extent of binding of an anti-4-1BB antibody to an unrelated, non-4-1BB protein is less than about 10% of the binding of the antibody to 4-1BB as measured, e.g., by a radioimmunoassay (RIA) or flow cytometry (FACS). In certain embodiments, an antibody that binds to 4-1BB has a dissociation constant (K D ) of ≤1 μM, ≤100 nM, ≤10 nM, ≤1 nM, ≤0.1 nM, ≤0.01 nM, or ≤0.001 nM (e.g. 10 −6  M or less, e.g. from 10 −68  M to 10 −13  M, e.g., from 10 −8  M to 10 −10  M). For example, urelumab is an anti-4-1BB antibody derived from antibody 20H4.9 and 
     The term “peptide linker” refers to a peptide comprising one or more amino acids, typically about 2 to 20 amino acids. Peptide linkers are known in the art or are described herein. Suitable, non-immunogenic linker peptides are, for example, (G 4 S) n , (SG 4 ) n  or G 4 (SG 4 ) n  peptide linkers, wherein “n” is generally a number between 1 and 10, typically between 2 and 4, in particular 2, i.e. the peptides selected from the group consisting of GGGGS (SEQ ID NO: 81) GGGGSGGGGS (SEQ ID NO:82), SGGGGSGGGG (SEQ ID NO:83) and GGGGSGGGGSGGGG (SEQ ID NO:84), but also include the sequences GSPGSSSSGS (SEQ ID NO:85), (G4S) 3  (SEQ ID NO:86), (G45)4 (SEQ ID NO:87), GSGSGSGS (SEQ ID NO:88), GSGSGNGS (SEQ ID NO:89), GGSGSGSG (SEQ ID NO:90), GGSGSG (SEQ ID NO:91), GGSG (SEQ ID NO:92), GGSGNGSG (SEQ ID NO:93), GGNGSGSG (SEQ ID NO:94) and GGNGSG (SEQ ID NO:95). Peptide linkers of particular interest are (G4S) (SEQ ID NO:81) and (G45)2 (SEQ ID NO:82). 
     The term “amino acid” as used within this application denotes the group of naturally occurring carboxy α-amino acids comprising alanine (three letter code: ala, one letter code: A), arginine (arg, R), asparagine (asn, N), aspartic acid (asp, D), cysteine (cys, C), glutamine (gln, Q), glutamic acid (glu, E), glycine (gly, G), histidine (his, H), isoleucine (ile, I), leucine (leu, L), lysine (lys, K), methionine (met, M), phenylalanine (phe, F), proline (pro, P), serine (ser, S), threonine (thr, T), tryptophan (trp, W), tyrosine (tyr, Y), and valine (val, V). 
     By “fused” or “connected” is meant that the components (e.g. a polypeptide and an ectodomain of 4-1BBL) are linked by peptide bonds, either directly or via one or more peptide linkers. 
     “Percent (%) amino acid sequence identity” with respect to a reference polypeptide (protein) sequence is defined as the percentage of amino acid residues in a candidate sequence that are identical with the amino acid residues in the reference polypeptide sequence, after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent sequence identity, and not considering any conservative substitutions as part of the sequence identity. Alignment for purposes of determining percent amino acid sequence identity can be achieved in various ways that are within the skill in the art, for instance, using publicly available computer software such as BLAST, BLAST-2, ALIGN. SAWI or Megalign (DNASTAR) software. Those skilled in the art can determine appropriate parameters for aligning sequences, including any algorithms needed to achieve maximal alignment over the full length of the sequences being compared. For purposes herein, however, % amino acid sequence identity values are generated using the sequence comparison computer program ALIGN-2. The ALIGN-2 sequence comparison computer program was authored by Genentech, Inc., and the source code has been filed with user documentation in the U.S. Copyright Office, Washington D.C., 20559, where it is registered under U.S. Copyright Registration No. TXU510087. The ALIGN-2 program is publicly available from Genentech, Inc., South San Francisco, Calif., or may be compiled from the source code. The ALIGN-2 program should be compiled for use on a UNIX operating system, including digital UNIX V4.0D. All sequence comparison parameters are set by the ALIGN-2 program and do not vary. In situations where ALIGN-2 is employed for amino acid sequence comparisons, the % amino acid sequence identity of a given amino acid sequence A to, with, or against a given amino acid sequence B (which can alternatively be phrased as a given amino acid sequence A that has or comprises a certain % amino acid sequence identity to, with, or against a given amino acid sequence B) is calculated as follows: 
       100 times the fraction X/Y 
     where X is the number of amino acid residues scored as identical matches by the sequence alignment program ALIGN-2 in that program&#39;s alignment of A and B, and where Y is the total number of amino acid residues in B. It will be appreciated that where the length of amino acid sequence A is not equal to the length of amino acid sequence B, the % amino acid sequence identity of A to B will not equal the % amino acid sequence identity of B to A. Unless specifically stated otherwise, all % amino acid sequence identity values used herein are obtained as described in the immediately preceding paragraph using the ALIGN-2 computer program. 
     In certain embodiments, amino acid sequence variants of the antigen binding molecules provided herein are contemplated. For example, it may be desirable to improve the binding affinity and/or other biological properties of the antigen binding molecules. Amino acid sequence variants of the antigen binding molecules may be prepared by introducing appropriate modifications into the nucleotide sequence encoding the molecules, or by peptide synthesis. Such modifications include, for example, deletions from, and/or insertions into and/or substitutions of residues within the amino acid sequences of the antibody. Any combination of deletion, insertion, and substitution can be made to arrive at the final construct, provided that the final construct possesses the desired characteristics, e.g., antigen-binding. Sites of interest for substitutional mutagenesis include the HVRs and Framework (FRs). Conservative substitutions are provided in Table C under the heading “Preferred Substitutions” and further described below in reference to amino acid side chain classes (1) to (6). Amino acid substitutions may be introduced into the molecule of interest and the products screened for a desired activity, e.g., retained/improved antigen binding, decreased immunogenicity, or improved ADCC or CDC. 
     
       
         
           
               
               
               
             
               
                 TABLE C 
               
               
                   
               
               
                 Original 
                 Exemplary 
                 Preferred 
               
               
                 Residue 
                 Substitutions 
                 Substitutions 
               
               
                   
               
             
            
               
                 Ala (A) 
                 Val; Leu; Ile 
                 Val 
               
               
                 Arg (R) 
                 Lys; Gln; Asn 
                 Lys 
               
               
                 Asn (N) 
                 Gln; His; Asp, Lys; Arg 
                 Gln 
               
               
                 Asp (D) 
                 Glu; Asn 
                 Glu 
               
               
                 Cys (C) 
                 Ser; Ala 
                 Ser 
               
               
                 Gln(Q) 
                 Asn; Glu 
                 Asn 
               
               
                 Glu (E) 
                 Asp; Gln 
                 Asp 
               
               
                 Gly (G) 
                 Ala 
                 Ala 
               
               
                 His (H) 
                 Asn; Gln; Lys; Arg 
                 Arg 
               
               
                 Ile (I) 
                 Leu; Val; Met; Ala; Phe; Norleucine 
                 Leu 
               
               
                 Leu (L) 
                 Norleucine; Ile; Val; Met; Ala; Phe 
                 Ile 
               
               
                 Lys (K) 
                 Arg; Gln; Asn 
                 Arg 
               
               
                 Met (M) 
                 Leu; Phe; Ile 
                 Leu 
               
               
                 Phe (F) 
                 Trp; Leu; Val; Ile; Ala; Tyr 
                 Tyr 
               
               
                 Pro (P) 
                 Ala 
                 Ala 
               
               
                 Ser (S) 
                 Thr 
                 Thr 
               
               
                 Thr (T) 
                 Val; Ser 
                 Ser 
               
               
                 Trp (W) 
                 Tyr; Phe 
                 Tyr 
               
               
                 Tyr (Y) 
                 Trp; Phe; Thr; Ser 
                 Phe 
               
               
                 Val (V) 
                 Ile; Leu; Met; Phe; Ala; Norleucine 
                 Leu 
               
               
                   
               
            
           
         
       
     
     Amino acids may be grouped according to common side-chain properties: 
     (1) hydrophobic: Norleucine, Met, Ala, Val, Leu, Ile; 
     (2) neutral hydrophilic: Cys, Ser, Thr, Asn, Gln; 
     (3) acidic: Asp, Glu; 
     (4) basic: His, Lys, Arg; 
     (5) residues that influence chain orientation: Gly, Pro; 
     (6) aromatic: Trp, Tyr, Phe. 
     Non-conservative substitutions will entail exchanging a member of one of these classes for another class. 
     The term “amino acid sequence variants” includes substantial variants wherein there are amino acid substitutions in one or more hypervariable region residues of a parent antigen binding molecule (e.g. a humanized or human antibody). Generally, the resulting variant(s) selected for further study will have modifications (e.g., improvements) in certain biological properties (e.g., increased affinity, reduced immunogenicity) relative to the parent antigen binding molecule and/or will have substantially retained certain biological properties of the parent antigen binding molecule. An exemplary substitutional variant is an affinity matured antibody, which may be conveniently generated, e.g., using phage display-based affinity maturation techniques such as those described herein. Briefly, one or more CDR residues are mutated and the variant antigen binding molecules displayed on phage and screened for a particular biological activity (e.g. binding affinity). In certain embodiments, substitutions, insertions, or deletions may occur within one or more CDRs so long as such alterations do not substantially reduce the ability of the antigen binding molecule to bind antigen. For example, conservative alterations (e.g., conservative substitutions as provided herein) that do not substantially reduce binding affinity may be made in CDRs. A useful method for identification of residues or regions of an antibody that may be targeted for mutagenesis is called “alanine scanning mutagenesis” as described by Cunningham and Wells (1989)  Science,  244:1081-1085. In this method, a residue or group of target residues (e.g., charged residues such as Arg, Asp, His, Lys, and Glu) are identified and replaced by a neutral or negatively charged amino acid (e.g., alanine or polyalanine) to determine whether the interaction of the antibody with antigen is affected. Further substitutions may be introduced at the amino acid locations demonstrating functional sensitivity to the initial substitutions. Alternatively, or additionally, a crystal structure of an antigen-antigen binding molecule complex to identify contact points between the antibody and antigen. Such contact residues and neighboring residues may be targeted or eliminated as candidates for substitution. Variants may be screened to determine whether they contain the desired properties. 
     Amino acid sequence insertions include amino- and/or carboxyl-terminal fusions ranging in length from one residue to polypeptides containing a hundred or more residues, as well as intrasequence insertions of single or multiple amino acid residues. Examples of terminal insertions include antigen binding molecules with an N-terminal methionyl residue. Other insertional variants of the molecule include the fusion to the N- or C-terminus to a polypeptide which increases the serum half-life of the antigen binding molecules. 
     In certain embodiments, the antigen binding molecules provided herein are altered to increase or decrease the extent to which the antibody is glycosylated. Glycosylation variants of the molecules may be conveniently obtained by altering the amino acid sequence such that one or more glycosylation sites is created or removed. Where the antigen binding molecule comprises an Fc region, the carbohydrate attached thereto may be altered. Native antibodies produced by mammalian cells typically comprise a branched, biantennary oligosaccharide that is generally attached by an N-linkage to Asn297 of the CH2 domain of the Fc region. See, e.g., Wright et al.  TIBTECH  15:26-32 (1997). The oligosaccharide may include various carbohydrates, e.g., mannose, N-acetyl glucosamine (GlcNAc), galactose, and sialic acid, as well as a fucose attached to a GlcNAc in the “stem” of the biantennary oligosaccharide structure. In some embodiments, modifications of the oligosaccharide in the antigen binding molecules may be made in order to create variants with certain improved properties. In one aspect, variants of antigen binding molecules are provided having a carbohydrate structure that lacks fucose attached (directly or indirectly) to an Fc region. Such fucosylation variants may have improved ADCC function, see e.g. US Patent Publication Nos. US 2003/0157108 (Presta, L.) or US 2004/0093621 (Kyowa Hakko Kogyo Co., Ltd). Further variants of the antigen binding molecules of the invention include those with bisected oligosaccharides, e.g., in which a biantennary oligosaccharide attached to the Fc region is bisected by GlcNAc. Such variants may have reduced fucosylation and/or improved ADCC function., see for example WO 2003/011878 (Jean-Mairet et al.); U.S. Pat. No. 6,602,684 (Umana et al.); and US 2005/0123546 (Umana et al.). Variants with at least one galactose residue in the oligosaccharide attached to the Fc region are also provided. Such antibody variants may have improved CDC function and are described, e.g., in WO 1997/30087 (Patel et al.); WO 1998/58964 (Raju, S.); and WO 1999/22764 (Raju, S.). 
     Engineering”, particularly with the prefix “glyco-”, as well as the term “glycosylation engineering” includes metabolic engineering of the glycosylation machinery of a cell, including genetic manipulations of the oligosaccharide synthesis pathways to achieve altered glycosylation of glycoproteins expressed in cells. Furthermore, glycosylation engineering includes the effects of mutations and cell environment on glycosylation. In one embodiment, the glycosylation engineering is an alteration in glycosyltransferase activity. In a particular embodiment, the engineering results in altered glucosaminyltransferase activity and/or fucosyltransferase activity. Glycosylation engineering can be used to obtain a “host cell having increased GnTIII activity” (e.g. a host cell that has been manipulated to express increased levels of one or more polypeptides having β(1,4)-N-acetylglucosaminyltransferase III (GnTIII) activity), a “host cell having increased ManII activity” (e.g. a host cell that has been manipulated to express increased levels of one or more polypeptides having α-mannosidase II (ManII) activity), or a “host cell having decreased α(1,6) fucosyltransferase activity” (e.g. a host cell that has been manipulated to express decreased levels of α(1,6) fucosyltransferase). 
     As used herein, the term “polypeptide having GnTIII activity” refers to polypeptides that are able to catalyze the addition of a N-acetylglucosamine (GlcNAc) residue in β-1,4 linkage to the β-linked mannoside of the trimannosyl core of N-linked oligosaccharides. This includes fusion polypeptides exhibiting enzymatic activity similar to, but not necessarily identical to, an activity of β(1,4)-N-acetylglucosaminyltransferase III, also known as β-1,4-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyl-transferase (EC 2.4.1.144), according to the Nomenclature Committee of the International Union of Biochemistry and Molecular Biology (NC-IUBMB), as measured in a particular biological assay, with or without dose dependency. In the case where dose dependency does exist, it need not be identical to that of GnTIII, but rather substantially similar to the dose-dependency in a given activity as compared to the GnTIII (i.e. the candidate polypeptide will exhibit greater activity or not more than about 25-fold less and, preferably, not more than about ten-fold less activity, and most preferably, not more than about three-fold less activity relative to the GnTIII). 
     Antibody-dependent cell-mediated cytotoxicity (ADCC) is an immune mechanism leading to the lysis of antibody-coated target cells by immune effector cells. The target cells are cells to which antibodies or fragments thereof comprising an Fc region specifically bind, generally via the protein part that is N-terminal to the Fc region. As used herein, the term “increased/reduced ADCC” is defined as either an increase/reduction in the number of target cells that are lysed in a given time, at a given concentration of antibody in the medium surrounding the target cells, by the mechanism of ADCC defined above, and/or a reduction/increase in the concentration of antibody, in the medium surrounding the target cells, required to achieve the lysis of a given number of target cells in a given time, by the mechanism of ADCC. The increase/reduction in ADCC is relative to the ADCC mediated by the same antibody produced by the same type of host cells, using the same standard production, purification, formulation and storage methods (which are known to those skilled in the art), but that has not been engineered. For example, the increase in ADCC mediated by an antibody produced by host cells engineered to have an altered pattern of glycosylation (e.g. to express the glycosyltransferase, GnTIII, or other glycosyltransferases) by the methods described herein, is relative to the ADCC mediated by the same antibody produced by the same type of non-engineered host cells. 
     In certain aspects, the invention contemplates an antibody variant that possesses some but not all effector functions, which make it a desirable candidate for applications in which the half life of the antibody in vivo is important yet certain effector functions (such as complement-dependent cytotoxicity (CDC) and antibody-dependent cell-mediated cytotoxicity (ADCC)) are unnecessary or deleterious. In vitro and/or in vivo cytotoxicity assays can be conducted to confirm the reduction/depletion of CDC and/or ADCC activities. For example, Fc receptor (FcR) binding assays can be conducted to ensure that the antibody lacks FcγR binding (hence likely lacking ADCC activity), but retains FcRn binding ability. The primary cells for mediating ADCC, NK cells, express FcγRIII only, whereas monocytes express FcγRI, FcγRII and FcγRIII. FcR expression on hematopoietic cells is summarized in Table 3 on page 464 of Ravetch and Kinet, Annu. Rev. Immunol. 9:457-492 (1991). Non-limiting examples of in vitro assays to assess ADCC activity of a molecule of interest is described in U.S. Pat. No. 5,500,362 (see, e.g. Hellstrom, I. et al. Proc. Nat&#39;l Acad. Sci. USA 83:7059-7063 (1986)) and Hellstrom, I et al., Proc. Nat&#39;l Acad. Sci. USA 82:1499-1502 (1985); 5,821,337 (see Bruggemann, M. et al., J. Exp. Med. 166:1351-1361 (1987)). Alternatively, non-radioactive assays methods may be employed (see, for example, ACTI™ non-radioactive cytotoxicity assay for flow cytometry (CellTechnology, Inc. Mountain View, Calif.; and CytoTox 96® non-radioactive cytotoxicity assay (Promega, Madison, Wis.). Useful effector cells for such assays include peripheral blood mononuclear cells (PBMC) and Natural Killer (NK) cells. Alternatively, or additionally, ADCC activity of the molecule of interest may be assessed in vivo, e.g., in a animal model such as that disclosed in Clynes et al. Proc. Nat&#39;l Acad. Sci. USA 95:652-656 (1998). C1q binding assays may also be carried out to confirm that the antibody is unable to bind C1q and hence lacks CDC activity. See, e.g., C1q and C3c binding ELISA in WO 2006/029879 and WO 2005/100402. To assess complement activation, a CDC assay may be performed (see, for example, Gazzano-Santoro et al., J. Immunol. Methods 202:163 (1996); Cragg, M. S. et al., Blood 101:1045-1052 (2003); and Cragg, M. S. and M. J. Glennie, Blood 103:2738-2743 (2004)). FcRn binding and in vivo clearance/half life determinations can also be performed using methods known in the art (see, e.g., Petkova, S. B. et al., Int&#39;l. Immunol. 18(12):1759-1769 (2006); WO 2013/120929 A1). 
     Antibodies with reduced effector function include those with substitution of one or more of Fc region residues 238, 265, 269, 270, 297, 327 and 329 (U.S. Pat. No. 6,737,056). Such Fc mutants include Fc mutants with substitutions at two or more of amino acid positions 265, 269, 270, 297 and 327, including the so-called “DANA” Fc mutant with substitution of residues 265 and 297 to alanine (U.S. Pat. No. 7,332,581). Certain antibody variants with improved or diminished binding to FcRs are described. (See, e.g., U.S. Pat. No. 6,737,056; WO 2004/056312, and Shields et al., J. Biol. Chem. 9(2): 6591-6604 (2001).) In certain embodiments, an antibody variant comprises an Fc region with one or more amino acid substitutions which improve ADCC, e.g., substitutions at positions 298, 333, and/or 334 of the Fc region (EU numbering of residues). 
     In certain aspects, an antibody variant comprises an Fc region with one or more amino acid substitutions which diminish FcγR binding, e.g., substitutions at positions 234 and 235 of the Fc region (EU numbering of residues). In one aspect, the substitutions are L234A and L235A (LALA). In certain aspects, the antibody variant further comprises D265A and/or P329G in an Fc region derived from a human IgG1 Fc region. In one aspect, the substitutions are L234A, L235A and P329G (LALA-PG) in an Fc region derived from a human IgG1 Fc region. (See, e.g., WO 2012/130831). In another aspect, the substitutions are L234A, L235A and D265A (LALA-DA) in an Fc region derived from a human IgG1 Fc region. 
     In some embodiments, alterations are made in the Fc region that result in altered (i.e., either improved or diminished) C1q binding and/or Complement Dependent Cytotoxicity (CDC), e.g., as described in U.S. Pat. No. 6,194,551, WO 99/51642, and Idusogie et al. J. Immunol. 164: 4178-4184 (2000). 
     Antibodies with increased half lives and improved binding to the neonatal Fc receptor (FcRn), which is responsible for the transfer of maternal IgGs to the fetus (Guyer et al., J. Immunol. 117:587 (1976) and Kim et al., J. Immunol. 24:249 (1994)), are described in US2005/0014934 (Hinton et al.). Those antibodies comprise an Fc region with one or more substitutions therein which improve binding of the Fc region to FcRn. Such Fc variants include those with substitutions at one or more of Fc region residues: 238, 252, 254, 256, 265, 272, 286, 303, 305, 307, 311, 312, 317, 340, 356, 360, 362, 376, 378, 380, 382, 413, 424 or 434, e.g., substitution of Fc region residue 434 (See, e.g., U.S. Pat. No. 7,371,826; Dall&#39;Acqua, W. F., et al. J. Biol. Chem. 281 (2006) 23514-23524). 
     In certain aspects, an antibody variant comprises an Fc region with one or more amino acid substitutions, which reduce FcRn binding, e.g., substitutions at positions 253, and/or 310, and/or 435 of the Fc-region (EU numbering of residues). In certain aspects, the antibody variant comprises an Fc region with the amino acid substitutions at positions 253, 310 and 435. In one aspect, the substitutions are I253A, H310A and H435A in an Fc region derived from a human IgG1 Fc-region. See e.g., Grevys, A., et al., J. Immunol. 194 (2015) 5497-5508. 
     In another aspect, an antibody variant comprises an Fc region with one or more amino acid substitutions, which reduce FcRn binding, e.g., substitutions at positions 310, and/or 433, and/or 436 of the Fc region (EU numbering of residues). In certain aspects, the antibody variant comprises an Fc region with the amino acid substitutions at positions 310, 433 and 436. In one aspect, the substitutions are H310A, H433A and Y436A in an Fc region derived from a human IgG1 Fc-region. (See, e.g., WO 2014/177460 A1). 
     In certain aspects, an antibody variant comprises an Fc region with one or more amino acid substitutions which increase FcRn binding, e.g., substitutions at positions 252, and/or 254, and/or 256 of the Fc region (EU numbering of residues). In certain embodiments, the antibody variant comprises an Fc region with amino acid substitutions at positions 252, 254, and 256. In one embodiment the substitutions are M252Y, S254T and T256E in an Fc region derived from a human IgG1 Fc-region (see also Duncan &amp; Winter, Nature 322:738-40 (1988); U.S. Pat. Nos. 5,648,260; 5,624,821; and WO 94/29351 concerning other examples of Fc region variants. 
     In certain embodiments, it may be desirable to create cysteine engineered variants of the antigen binding molecules of the invention, e.g., “thioMAbs,” in which one or more residues of the molecule are substituted with cysteine residues. In particular embodiments, the substituted residues occur at accessible sites of the molecule. By substituting those residues with cysteine, reactive thiol groups are thereby positioned at accessible sites of the antibody and may be used to conjugate the antibody to other moieties, such as drug moieties or linker-drug moieties, to create an immunoconjugate. In certain embodiments, any one or more of the following residues may be substituted with cysteine: V205 (Kabat numbering) of the light chain; A118 (EU numbering) of the heavy chain; and S400 (EU numbering) of the heavy chain Fc region. Cysteine engineered antigen binding molecules may be generated as described, e.g., in U.S. Pat. No. 7,521,541. 
     In certain aspects, the antigen binding molecules provided herein may be further modified to contain additional non-proteinaceous moieties that are known in the art and readily available. The moieties suitable for derivatization of the antibody include but are not limited to water soluble polymers. Non-limiting examples of water soluble polymers include, but are not limited to, polyethylene glycol (PEG), copolymers of ethylene glycol/propylene glycol, carboxymethylcellulose, dextran, polyvinyl alcohol, polyvinyl pyrrolidone, poly-1,3-dioxolane, poly-1,3,6-trioxane, ethylene/maleic anhydride copolymer, polyaminoacids (either homopolymers or random copolymers), and dextran or poly(n-vinyl pyrrolidone)polyethylene glycol, propropylene glycol homopolymers, prolypropylene oxide/ethylene oxide co-polymers, polyoxyethylated polyols (e.g., glycerol), polyvinyl alcohol, and mixtures thereof. Polyethylene glycol propionaldehyde may have advantages in manufacturing due to its stability in water. The polymer may be of any molecular weight, and may be branched or unbranched. The number of polymers attached to the antibody may vary, and if more than one polymer is attached, they can be the same or different molecules. In general, the number and/or type of polymers used for derivatization can be determined based on considerations including, but not limited to, the particular properties or functions of the antibody to be improved, whether the bispecific antibody derivative will be used in a therapy under defined conditions, etc. In another aspect, conjugates of an antibody and non-proteinaceous moiety that may be selectively heated by exposure to radiation are provided. In one embodiment, the non-proteinaceous moiety is a carbon nanotube (Kam, N. W. et al., Proc. Natl. Acad. Sci. USA 102 (2005) 11600-11605). The radiation may be of any wavelength, and includes, but is not limited to, wavelengths that do not harm ordinary cells, but which heat the non-proteinaceous moiety to a temperature at which cells proximal to the antibody-non-proteinaceous moiety are killed. In another aspect, immunoconjugates of the 4-1BBL-containing antigen binding molecules provided herein maybe obtained. An “immunoconjugate” is an antibody conjugated to one or more heterologous molecule(s), including but not limited to a cytotoxic agent. 
     The term “polynucleotide” refers to an isolated nucleic acid molecule or construct, e.g. messenger RNA (mRNA), virally-derived RNA, or plasmid DNA (pDNA). A polynucleotide may comprise a conventional phosphodiester bond or a non-conventional bond (e.g. an amide bond, such as found in peptide nucleic acids (PNA). The term “nucleic acid molecule” refers to any one or more nucleic acid segments, e.g. DNA or RNA fragments, present in a polynucleotide. 
     By “isolated” nucleic acid molecule or polynucleotide is intended a nucleic acid molecule, DNA or RNA, which has been removed from its native environment. For example, a recombinant polynucleotide encoding a polypeptide contained in a vector is considered isolated for the purposes of the present invention. Further examples of an isolated polynucleotide include recombinant polynucleotides maintained in heterologous host cells or purified (partially or substantially) polynucleotides in solution. An isolated polynucleotide includes a polynucleotide molecule contained in cells that ordinarily contain the polynucleotide molecule, but the polynucleotide molecule is present extrachromosomally or at a chromosomal location that is different from its natural chromosomal location. Isolated RNA molecules include in vivo or in vitro RNA transcripts of the present invention, as well as positive and negative strand forms, and double-stranded forms. Isolated polynucleotides or nucleic acids according to the present invention further include such molecules produced synthetically. In addition, a polynucleotide or a nucleic acid may be or may include a regulatory element such as a promoter, ribosome binding site, or a transcription terminator. 
     By a nucleic acid or polynucleotide having a nucleotide sequence at least, for example, 95% “identical” to a reference nucleotide sequence of the present invention, it is intended that the nucleotide sequence of the polynucleotide is identical to the reference sequence except that the polynucleotide sequence may include up to five point mutations per each 100 nucleotides of the reference nucleotide sequence. In other words, to obtain a polynucleotide having a nucleotide sequence at least 95% identical to a reference nucleotide sequence, up to 5% of the nucleotides in the reference sequence may be deleted or substituted with another nucleotide, or a number of nucleotides up to 5% of the total nucleotides in the reference sequence may be inserted into the reference sequence. These alterations of the reference sequence may occur at the 5′ or 3′ terminal positions of the reference nucleotide sequence or anywhere between those terminal positions, interspersed either individually among residues in the reference sequence or in one or more contiguous groups within the reference sequence. As a practical matter, whether any particular polynucleotide sequence is at least 80%, 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to a nucleotide sequence of the present invention can be determined conventionally using known computer programs, such as the ones discussed above for polypeptides (e.g. ALIGN-2). 
     The term “expression cassette” refers to a polynucleotide generated recombinantly or synthetically, with a series of specified nucleic acid elements that permit transcription of a particular nucleic acid in a target cell. The recombinant expression cassette can be incorporated into a plasmid, chromosome, mitochondrial DNA, plastid DNA, virus, or nucleic acid fragment. Typically, the recombinant expression cassette portion of an expression vector includes, among other sequences, a nucleic acid sequence to be transcribed and a promoter. In certain embodiments, the expression cassette of the invention comprises polynucleotide sequences that encode bispecific antigen binding molecules of the invention or fragments thereof. 
     The term “vector” or “expression vector” is synonymous with “expression construct” and refers to a DNA molecule that is used to introduce and direct the expression of a specific gene to which it is operably associated in a target cell. The term includes the vector as a self-replicating nucleic acid structure as well as the vector incorporated into the genome of a host cell into which it has been introduced. The expression vector of the present invention comprises an expression cassette. Expression vectors allow transcription of large amounts of stable mRNA. Once the expression vector is inside the target cell, the ribonucleic acid molecule or protein that is encoded by the gene is produced by the cellular transcription and/or translation machinery. In one embodiment, the expression vector of the invention comprises an expression cassette that comprises polynucleotide sequences that encode bispecific antigen binding molecules of the invention or fragments thereof. 
     The terms “host cell”, “host cell line,” and “host cell culture” are used interchangeably and refer to cells into which exogenous nucleic acid has been introduced, including the progeny of such cells. Host cells include “transformants” and “transformed cells,” which include the primary transformed cell and progeny derived therefrom without regard to the number of passages. Progeny may not be completely identical in nucleic acid content to a parent cell, but may contain mutations. Mutant progeny that have the same function or biological activity as screened or selected for in the originally transformed cell are included herein. A host cell is any type of cellular system that can be used to generate the bispecific antigen binding molecules of the present invention. Host cells include cultured cells, e.g. mammalian cultured cells, such as CHO cells, BHK cells, NSO cells, SP2/0 cells, YO myeloma cells, P3X63 mouse myeloma cells, PER cells, PER.C6 cells or hybridoma cells, yeast cells, insect cells, and plant cells, to name only a few, but also cells comprised within a transgenic animal, transgenic plant or cultured plant or animal tissue. 
     An “effective amount” of an agent refers to the amount that is necessary to result in a physiological change in the cell or tissue to which it is administered. 
     A “therapeutically effective amount” of an agent, e.g. a pharmaceutical composition, refers to an amount effective, at dosages and for periods of time necessary, to achieve the desired therapeutic or prophylactic result. A therapeutically effective amount of an agent for example eliminates, decreases, delays, minimizes or prevents adverse effects of a disease. 
     An “individual” or “subject” is a mammal. Mammals include, but are not limited to, domesticated animals (e.g. cows, sheep, cats, dogs, and horses), primates (e.g. humans and non-human primates such as monkeys), rabbits, and rodents (e.g. mice and rats). Particularly, the individual or subject is a human. 
     The term “pharmaceutical composition” refers to a preparation which is in such form as to permit the biological activity of an active ingredient contained therein to be effective, and which contains no additional components which are unacceptably toxic to a subject to which the formulation would be administered. 
     A “pharmaceutically acceptable excipient” refers to an ingredient in a pharmaceutical composition, other than an active ingredient, which is nontoxic to a subject. A pharmaceutically acceptable excipient includes, but is not limited to, a buffer, a stabilizer, or a preservative. 
     The term “package insert” is used to refer to instructions customarily included in commercial packages of therapeutic products, that contain information about the indications, usage, dosage, administration, combination therapy, contraindications and/or warnings concerning the use of such therapeutic products. 
     As used herein, “treatment” (and grammatical variations thereof such as “treat” or “treating”) refers to clinical intervention in an attempt to alter the natural course of the individual being treated, and can be performed either for prophylaxis or during the course of clinical pathology. Desirable effects of treatment include, but are not limited to, preventing occurrence or recurrence of disease, alleviation of symptoms, diminishment of any direct or indirect pathological consequences of the disease, preventing metastasis, decreasing the rate of disease progression, amelioration or palliation of the disease state, and remission or improved prognosis. In some embodiments, the molecules of the invention are used to delay development of a disease or to slow the progression of a disease. 
     The term “cancer” as used herein refers to proliferative diseases, such as lymphomas or lymphocytic leukemias, or melanoma. 
     By “B cell proliferative disorder” is meant a disease wherein the number of B cells in a patient is increased as compared to the number of B cells in a healthy subj ect, and particularly wherein the increase in the number of B cells is the cause or hallmark of the disease. A “CD20-positive B cell proliferative disorder” is a B cell proliferative disorder wherein B-cells, particularly malignant B-cells (in addition to normal B-cells), express CD20. Exemplary B cell proliferation disorders include Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), as well as some types of Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     Exemplary 4-1BB Agonists for Use in the Invention 
     In particular, the 4-1BB agonists comprising at least one antigen binding domain capable of specific binding to CD19 as used in combination with the anti-CD20 antibody are molecules comprising 4-1BBL. In particular, the 4-1BB agonist used in the invention comprises three ectodomains of 4-1BBL or fragments thereof. 
     In a particular aspect, the 4-1BB agonist is a molecule comprising three ectodomains of 4-1BBL or fragments thereof and wherein the ectodomains of 4-1BBL comprise an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO: 6, SEQ ID NO:7 and SEQ ID NO:8, particularly the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:5. 
     It has been shown herein, that the 4-1BB agonist is especially useful if it comprises an antigen binding domain that is specific for a tumor target, in particular for a target on B cells. Thus, in another aspect, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to CD19. 
     It has been further shown herein, that a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 was not internalized by CD19 into B cells and thus did not loss its ability to interact with the tumor microenvironment. In a further aspect, provided is a 4-1BB agonist that will not be internalized in B cells, thereby maintaining its activity. 
     In another aspect, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one moiety capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 is cyno-cross-reactive, i.e. the antigen binding domain capable of specific binding to CD19 specifically binds to human and to cynomolgus CD19. 
     In a further aspect, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one moiety capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises
     (a) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:9, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:10, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:11, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:14, or   (b) a VH domain comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a VL domain comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20.   

     In a particular aspect, the antigen binding domain capable of specific binding to CD19 comprises a VH domain comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a VL domain comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20. 
     In a further aspect, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:22 or wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. More particularly, the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. 
     In another aspect, the 4-1BB agonist is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. In one aspect, the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. Particularly, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces binding to an Fc receptor and/or effector function. In a particular aspect, the 4-1BB agonist is an antigen binding molecule comprising an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     In one aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     In a particular aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     In another aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19 comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:22 or a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:24, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     In a particular aspect, the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:39 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:40; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:49 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:50; 
     j) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     k) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; and 
     l) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:51 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:52. 
     In another aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     In one aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers, and   (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the polypeptide comprising the three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers is fused to the N- or C-terminal amino acid of one of the two subunits of the Fc domain, optionally through a peptide linker.   

     In a particular aspect, the 4-1BB agonist is an antigen binding molecule selected from the group consisting of
     (a) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:53,   (b) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48 and a fusion protein comprising the amino acid sequence of SEQ ID NO:53;   (c) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:54, and   (d) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48, and a fusion protein comprising the amino acid sequence of SEQ ID NO:55.   

     In a further aspect, the 4-1BB agonist is an anti-CD19/anti-4-1BB bispecific antibody. 
     In a further aspect, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to FAP, wherein the antigen binding domain capable of specific binding to FAP comprises
     (a) a heavy chain variable region (V H FAP) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:96, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:97, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:98, and a light chain variable region (V L FAP) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:99, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:100, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:101, or   (b) a heavy chain variable region (V H FAP) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:102, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:103, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:104, and a light chain variable region (V L FAP) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:105, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:106, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:107.   

     In a particular aspect, the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:102, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:103, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:104, and a light chain variable region (V L FAP) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:105, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:106, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:107. 
     In a further aspect, the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to FAP, wherein the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising an amino acid sequence of SEQ ID NO:108 and a light chain variable region (V L FAP) comprising an amino acid sequence of SEQ ID NO:109 or wherein the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising an amino acid sequence of SEQ ID NO:110 and a light chain variable region (V L FAP) comprising an amino acid sequence of SEQ ID NO:111. More particularly, the antigen binding domain capable of specific binding to FAP comprises a heavy chain variable region (V H FAP) comprising an amino acid sequence of SEQ ID NO:110 and a light chain variable region (V L FAP) comprising an amino acid sequence of SEQ ID NO:111. 
     In another aspect, the 4-1BB agonist is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. In one aspect, the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. Particularly, the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces binding to an Fc receptor and/or effector function. In a particular aspect, the 4-1BB agonist is an antigen binding molecule comprising an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     In one aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to FAP,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     In a particular aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to FAP, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     In a particular aspect, the 4-1BB agonist is an antigen binding molecule selected from the group consisting of a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:112, a first light chain comprising the amino acid sequence of SEQ ID NO:113, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42. 
     In another aspect, the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to FAP,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     Particular bispecific antibodies are described in PCT publication No. WO 2016/075278 Al or in PCT publication No. WO 2016/156291A1. 
     In a further aspect, the 4-1BB agonist is an anti-FAP/anti-4-1BB bispecific antibody. 
     Preparation of Antigen Binding Molecules for Use in the Invention 
     In certain aspects, the therapeutic agents used in the combination comprise multispecific antibodies, e.g. bispecific antibodies. Multispecific antibodies are monoclonal antibodies that have binding specificities for at least two different sites. In certain aspects, the binding specificities are for different antigens. In certain aspects, the binding specificities are for different epitopes on the same antigen. Bispecific antibodies can be prepared as full length antibodies or antibody fragments. 
     Techniques for making multispecific antibodies include, but are not limited to, recombinant co-expression of two immunoglobulin heavy chain-light chain pairs having different specificities (see Milstein and Cuello, Nature 305: 537 (1983)), WO 93/08829, and Traunecker et al., EMBO J. 10: 3655 (1991)), and “knob-in-hole” engineering (see, e.g., U.S. Pat. No. 5,731,168). Multi-specific antibodies may also be made by engineering electrostatic steering effects for making antibody Fc-heterodimeric molecules (WO 2009/089004A1); cross-linking of two or more antibodies or fragments (see, e.g., U.S. Pat. No. 4,676,980, and Brennan et al., Science, 229: 81 (1985)); using leucine zippers to produce bi-specific antibodies (see, e.g., Kostelny et al., J. Immunol., 148(5):1547-1553 (1992)); using “diabody” technology for making bispecific antibody fragments (see, e.g., Hollinger et al., Proc. Natl. Acad. Sci. USA, 90:6444-6448 (1993)); and using single-chain Fv (sFv) dimers (see, e.g. Gruber et al., J. Immunol., 152:5368 (1994)); and preparing trispecific antibodies as described, e.g., in Tutt et al. J. Immunol. 147: 60 (1991). 
     Engineered antibodies with three or more functional antigen binding sites, including “Octopus antibodies,” are also included herein (see, e.g. US 2006/0025576A1). 
     The antibodies or fragments herein also include a “Dual Acting FAb” or “DAF” comprising an antigen binding site that binds to two different antigens (see, US 2008/0069820, for example). “Crossmab” antibodies are also included herein (see e.g. WO 2009/080251, WO 2009/080252, WO2009/080253, or WO2009/080254). 
     Another technique for making bispecific antibody fragments is the “bispecific T cell engager” or BiTE® approach (see, e.g., WO2004/106381, WO2005/061547, WO2007/042261, and WO2008/119567). This approach utilizes two antibody variable domains arranged on a single polypeptide. For example, a single polypeptide chain includes two single chain Fv (scFv) fragments, each having a variable heavy chain (VH) and a variable light chain (VL) domain separated by a polypeptide linker of a length sufficient to allow intramolecular association between the two domains. This single polypeptide further includes a polypeptide spacer sequence between the two scFv fragments. Each scFv recognizes a different epitope, and these epitopes may be specific for different cell types, such that cells of two different cell types are brought into close proximity or tethered when each scFv is engaged with its cognate epitope. One particular embodiment of this approach includes a scFv recognizing a cell-surface antigen expressed by an immune cell, e.g., a CD3 polypeptide on a T cell, linked to another scFv that recognizes a cell-surface antigen expressed by a target cell, such as a malignant or tumor cell. 
     As it is a single polypeptide, the bispecific T cell engager may be expressed using any prokaryotic or eukaryotic cell expression system known in the art, e.g., a CHO cell line. However, specific purification techniques (see, e.g., EP1691833) may be necessary to separate monomeric bispecific T cell engagers from other multimeric species, which may have biological activities other than the intended activity of the monomer. In one exemplary purification scheme, a solution containing secreted polypeptides is first subjected to a metal affinity chromatography, and polypeptides are eluted with a gradient of imidazole concentrations. This eluate is further purified using anion exchange chromatography, and polypeptides are eluted using with a gradient of sodium chloride concentrations. Finally, this eluate is subjected to size exclusion chromatography to separate monomers from multimeric species. In one aspect, the bispecific bispecific antibodies used in the invention are composed of a single polypeptide chain comprising two single chain FV fragments (scFV) fused to each other by a peptide linker. 
     Fc Domain Modifications Reducing Fc Receptor Binding and/or Effector Function 
     The Fc domain of the antigen binding molecules of the invention consists of a pair of polypeptide chains comprising heavy chain domains of an immunoglobulin molecule. For example, the Fc domain of an immunoglobulin G (IgG) molecule is a dimer, each subunit of which comprises the CH2 and CH3 IgG heavy chain constant domains. The two subunits of the Fc domain are capable of stable association with each other. 
     The Fc domain confers favorable pharmacokinetic properties to the antigen binding molecules of the invention, including a long serum half-life which contributes to good accumulation in the target tissue and a favorable tissue-blood distribution ratio. At the same time it may, however, lead to undesirable targeting of the bispecific antibodies of the invention to cells expressing Fc receptors rather than to the preferred antigen-bearing cells. Accordingly, in particular aspects, the Fc domain of the antigen binding molecules of the invention exhibits reduced binding affinity to an Fc receptor and/or reduced effector function, as compared to a native IgG1 Fc domain. In one aspect, the Fc does not substantially bind to an Fc receptor and/or does not induce effector function. In a particular aspect the Fc receptor is an Fcγ receptor. In one aspect, the Fc receptor is a human Fc receptor. In a specific aspect, the Fc receptor is an activating human Fcγ receptor, more specifically human FcγRIIIa, FcγRI or FcγRIIa, most specifically human FcγRIIIa. In one aspect, the Fc domain does not induce effector function. The reduced effector function can include, but is not limited to, one or more of the following: reduced complement dependent cytotoxicity (CDC), reduced antibody-dependent cell-mediated cytotoxicity (ADCC), reduced antibody-dependent cellular phagocytosis (ADCP), reduced cytokine secretion, reduced immune complex-mediated antigen uptake by antigen-presenting cells, reduced binding to NK cells, reduced binding to macrophages, reduced binding to monocytes, reduced binding to polymorphonuclear cells, reduced direct signaling inducing apoptosis, reduced dendritic cell maturation, or reduced T cell priming. 
     In certain aspects, one or more amino acid modifications may be introduced into the Fc region of an antibody provided herein, thereby generating an Fc region variant. The Fc region variant may comprise a human Fc region sequence (e.g., a human IgG1, IgG2, IgG3 or IgG4 Fc region) comprising an amino acid modification (e.g. a substitution) at one or more amino acid positions. 
     In a particular aspect, the invention provides an antibody, wherein the Fc domain comprises one or more amino acid substitution that reduces binding to an Fc receptor, in particular towards Fcγ receptor. 
     In one aspect, the Fc domain of the antibody of the invention comprises one or more amino acid mutation that reduces the binding affinity of the Fc domain to an Fc receptor and/or effector function. Typically, the same one or more amino acid mutation is present in each of the two subunits of the Fc domain. In particular, the Fc domain comprises an amino acid substitution at a position of E233, L234, L235, N297, P331 and P329 (EU numbering). In particular, the Fc domain comprises amino acid substitutions at positions 234 and 235 (EU numbering) and/or 329 (EU numbering) of the IgG heavy chains. More particularly, provided is an antibody according to the invention which comprises an Fc domain with the amino acid substitutions L234A, L235A and P329G (“P329G LALA”, EU numbering) in the IgG heavy chains. The amino acid substitutions L234A and L235A refer to the so-called LALA mutation. The “P329G LALA” combination of amino acid substitutions almost completely abolishes Fcγ receptor binding of a human IgG1 Fc domain and is described in International Patent Appl. Publ. No. WO 2012/130831 A1 which also describes methods of preparing such mutant Fc domains and methods for determining its properties such as Fc receptor binding or effector functions. 
     Fc domains with reduced Fc receptor binding and/or effector function also include those with substitution of one or more of Fc domain residues 238, 265, 269, 270, 297, 327 and 329 (U.S. Pat. No. 6,737,056). Such Fc mutants include Fc mutants with substitutions at two or more of amino acid positions 265, 269, 270, 297 and 327, including the so-called “DANA” Fc mutant with substitution of residues 265 and 297 to alanine (U.S. Pat. No. 7,332,581). 
     In another aspect, the Fc domain is an IgG4 Fc domain. IgG4 antibodies exhibit reduced binding affinity to Fc receptors and reduced effector functions as compared to IgG1 antibodies. In a more specific aspect, the Fc domain is an IgG4 Fc domain comprising an amino acid substitution at position S228 (Kabat numbering), particularly the amino acid substitution S228P. In a more specific aspect, the Fc domain is an IgG4 Fc domain comprising amino acid substitutions L235E and S228P and P329G (EU numbering). Such IgG4 Fc domain mutants and their Fcγ receptor binding properties are also described in WO 2012/130831. 
     Mutant Fc domains can be prepared by amino acid deletion, substitution, insertion or modification using genetic or chemical methods well known in the art. Genetic methods may include site-specific mutagenesis of the encoding DNA sequence, PCR, gene synthesis, and the like. The correct nucleotide changes can be verified for example by sequencing. 
     Binding to Fc receptors can be easily determined e.g. by ELISA, or by Surface Plasmon Resonance (SPR) using standard instrumentation such as a BIAcore instrument (GE Healthcare), and Fc receptors such as may be obtained by recombinant expression. Alternatively, binding affinity of Fc domains or cell activating antibodies comprising an Fc domain for Fc receptors may be evaluated using cell lines known to express particular Fc receptors, such as human NK cells expressing FcγIIIa receptor. 
     Effector function of an Fc domain, or antibodies of the invention comprising an Fc domain, can be measured by methods known in the art. A suitable assay for measuring ADCC is described herein. Other examples of in vitro assays to assess ADCC activity of a molecule of interest are described in U.S. Pat. No. 5,500,362; Hellstrom et al. Proc Natl Acad Sci USA 83, 7059-7063 (1986) and Hellstrom et al., Proc Natl Acad Sci USA 82, 1499-1502 (1985); U.S. Pat. No. 5,821,337; Bruggemann et al., J Exp Med 166, 1351-1361 (1987). Alternatively, non-radioactive assays methods may be employed (see, for example, ACTI™ non-radioactive cytotoxicity assay for flow cytometry (CellTechnology, Inc. Mountain View, Calif.); and CytoTox 96® non-radioactive cytotoxicity assay (Promega, Madison, Wis.)). Useful effector cells for such assays include peripheral blood mononuclear cells (PBMC) and Natural Killer (NK) cells. Alternatively, or additionally, ADCC activity of the molecule of interest may be assessed in vivo, e.g. in an animal model such as that disclosed in Clynes et al., Proc Natl Acad Sci USA 95, 652-656 (1998). 
     In some aspects, binding of the Fc domain to a complement component, specifically to C1q, is reduced. Accordingly, in some embodiments wherein the Fc domain is engineered to have reduced effector function, said reduced effector function includes reduced CDC. C1q binding assays may be carried out to determine whether the bispecific antigen binding molecule of the invention is able to bind C1q and hence has CDC activity (see e.g., C1q and C3c binding ELISA in WO 2006/029879 and WO 2005/100402). To assess complement activation, a CDC assay may be performed (see, for example, Gazzano-Santoro et al., J Immunol Methods 202, 163 (1996); Cragg et al., Blood 101, 1045-1052 (2003); and Cragg and Glennie, Blood 103, 2738-2743 (2004)). 
     Fc Domain Modifications Promoting Heterodimerization 
     The bispecific antigen binding molecules of the invention comprise different antigen-binding sites, fused to one or the other of the two subunits of the Fc domain, thus the two subunits of the Fc domain may be comprised in two non-identical polypeptide chains. Recombinant co-expression of these polypeptides and subsequent dimerization leads to several possible combinations of the two polypeptides. To improve the yield and purity of the bispecific antibodies of the invention in recombinant production, it will thus be advantageous to introduce in the Fc domain of the bispecific antigen binding molecules of the invention a modification promoting the association of the desired polypeptides. 
     Accordingly, in particular aspects the invention relates to the bispecific antigen binding molecule comprising (a) at least one moiety capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises two ectodomains of a TNF ligand family member or two fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises only one ectodomain of said TNF ligand family member or a fragment thereof, and (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the Fc domain comprises a modification promoting the association of the first and second subunit of the Fc domain. The site of most extensive protein-protein interaction between the two subunits of a human IgG Fc domain is in the CH3 domain of the Fc domain. Thus, in one aspect said modification is in the CH3 domain of the Fc domain. 
     In a specific aspect said modification is a so-called “knob-into-hole” modification, comprising a “knob” modification in one of the two subunits of the Fc domain and a “hole” modification in the other one of the two subunits of the Fc domain. Thus, the invention relates to an antigen binding molecule comprising (a) at least one moiety capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, (b) a first and a second polypeptide that are linked to each other by a disulfide bond, 
     wherein the antigen binding molecule is characterized in that the first polypeptide comprises two ectodomains of 4-1BBL or two fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises only one ectodomain of said 4-1BBL or a fragment thereof, and (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the first subunit of the Fc domain comprises knobs and the second subunit of the Fc domain comprises holes according to the knobs into holes method. In a particular aspect, the first subunit of the Fc domain comprises the amino acid substitutions S354C and T366W (EU numbering) and the second subunit of the Fc domain comprises the amino acid substitutions Y349C, T366S and Y407V (numbering according to Kabat EU index). 
     The knob-into-hole technology is described e.g. in U.S. Pat. Nos. 5,731,168; 7,695,936; Ridgway et al., Prot Eng 9, 617-621 (1996) and Carter, J Immunol Meth 248, 7-15 (2001). Generally, the method involves introducing a protuberance (“knob”) at the interface of a first polypeptide and a corresponding cavity (“hole”) in the interface of a second polypeptide, such that the protuberance can be positioned in the cavity so as to promote heterodimer formation and hinder homodimer formation. Protuberances are constructed by replacing small amino acid side chains from the interface of the first polypeptide with larger side chains (e.g. tyrosine or tryptophan). Compensatory cavities of identical or similar size to the protuberances are created in the interface of the second polypeptide by replacing large amino acid side chains with smaller ones (e.g. alanine or threonine). 
     Accordingly, in one aspect, in the CH3 domain of the first subunit of the Fc domain of the bispecific antigen binding molecules of the invention an amino acid residue is replaced with an amino acid residue having a larger side chain volume, thereby generating a protuberance within the CH3 domain of the first subunit which is positionable in a cavity within the CH3 domain of the second subunit, and in the CH3 domain of the second subunit of the Fc domain an amino acid residue is replaced with an amino acid residue having a smaller side chain volume, thereby generating a cavity within the CH3 domain of the second subunit within which the protuberance within the CH3 domain of the first subunit is positionable. The protuberance and cavity can be made by altering the nucleic acid encoding the polypeptides, e.g. by site-specific mutagenesis, or by peptide synthesis. In a specific aspect, in the CH3 domain of the first subunit of the Fc domain the threonine residue at position 366 is replaced with a tryptophan residue (T366W), and in the CH3 domain of the second subunit of the Fc domain the tyrosine residue at position 407 is replaced with a valine residue (Y407V). In one aspect, in the second subunit of the Fc domain additionally the threonine residue at position 366 is replaced with a serine residue (T366S) and the leucine residue at position 368 is replaced with an alanine residue (L368A). 
     In yet a further aspect, in the first subunit of the Fc domain additionally the serine residue at position 354 is replaced with a cysteine residue (S354C), and in the second subunit of the Fc domain additionally the tyrosine residue at position 349 is replaced by a cysteine residue (Y349C). Introduction of these two cysteine residues results in the formation of a disulfide bridge between the two subunits of the Fc domain that further stabilizes the dimer (Carter (2001), J Immunol Methods 248, 7-15). In a particular aspect, the first subunit of the Fc domain comprises the amino acid substitutions S354C and T366W (EU numbering) and the second subunit of the Fc domain comprises the amino acid substitutions Y349C, T366S and Y407V (numbering according to Kabat EU index). 
     In an alternative aspect, a modification promoting association of the first and the second subunit of the Fc domain comprises a modification mediating electrostatic steering effects, e.g. as described in PCT publication WO 2009/089004. Generally, this method involves replacement of one or more amino acid residues at the interface of the two Fc domain subunits by charged amino acid residues so that homodimer formation becomes electrostatically unfavorable but heterodimerization electrostatically favorable. 
     The C-terminus of the heavy chain of the bispecific antibody as reported herein can be a complete C-terminus ending with the amino acid residues PGK. The C-terminus of the heavy chain can be a shortened C-terminus in which one or two of the C terminal amino acid residues have been removed. In one preferred aspect, the C-terminus of the heavy chain is a shortened C-terminus ending PG. In one aspect of all aspects as reported herein, a bispecific antibody comprising a heavy chain including a C-terminal CH3 domain as specified herein, comprises the C-terminal glycine-lysine dipeptide (G446 and K447, numbering according to Kabat EU index). In one aspect of all aspects as reported herein, a bispecific antibody comprising a heavy chain including a C-terminal CH3 domain, as specified herein, comprises a C-terminal glycine residue (G446, numbering according to Kabat EU index). 
     Modifications in the Fab Domains 
     In one aspect, the invention relates to a 4-1BBL-containing antigen binding molecule, comprising (a) a Fab fragment capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises two ectodomains of 4-1BBL or two fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises only one ectodomain of 4-1BBL or a fragment thereof, and (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein in one of the Fab fragments either the variable domains VH and VL or the constant domains CH1 and CL are exchanged. The bispecific antibodies are prepared according to the Crossmab technology. 
     Multispecific antibodies with a domain replacement/exchange in one binding arm (CrossMabVH-VL or CrossMabCH-CL) are described in detail in WO2009/080252 and Schaefer, W. et al, PNAS, 108 (2011) 11187-1191. They clearly reduce the byproducts caused by the mismatch of a light chain against a first antigen with the wrong heavy chain against the second antigen (compared to approaches without such domain exchange). 
     In one aspect, the invention relates to a bispecific antigen binding molecule comprising (a) a first Fab fragment capable of specific binding to CD19, (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises two ectodomains of 4-1BBL or two fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises only one ectodomain of 4-1BBL or a fragment thereof, and wherein each of them is linked to a CH1 or CL domain, and (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the constant domains CL and CH1 adjacent to 4-1BBL are replaced by each other so that the CH1 domain is part of the light chain and the CL domain is part of the heavy chain. 
     In another aspect, the invention relates to a bispecific antigen binding molecule, comprising (a) two light chains and two heavy chains of an antibody comprising two Fab fragments capable of specific binding to a costimulatory TNF receptor family member and the Fc domain, and (b) two additional Fab fragments capable of specific binding to a target cell antigen, wherein said additional Fab fragments are each connected via a peptide linker to the C-terminus of the heavy chains of (a). In a particular aspect, the additional Fab fragments are Fab fragments, wherein the variable domains VL and VH are replaced by each other so that the VH domain is part of the light chain and the VL domain is part of the heavy chain. 
     In another aspect, and to further improve correct pairing, the bispecific antigen binding molecule comprising (a) a first Fab fragment capable of specific binding to CD19, (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises two ectodomains of 4-1BBL or two fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises only one ectodomain of 4-1BBL or a fragment thereof, and wherein each of them is linked to a CH1 or CL domain, and (c) a Fc domain composed of a first and a second subunit capable of stable association, can contain different charged amino acid substitutions (so-called “charged residues”). These modifications are introduced in the crossed or non-crossed CH1 and CL domains. In a particular aspect, the invention relates to a bispecific antigen binding molecule, wherein in one of CL domains the amino acid at position 123 (EU numbering) has been replaced by arginine (R) and the amino acid at position 124 (EU numbering) has been substituted by lysine (K) and wherein in one of the CH1 domains the amino acids at position 147 (EU numbering) and at position 213 (EU numbering) have been substituted by glutamic acid (E). 
     More particularly, the invention relates to a bispecific antigen binding molecule comprising a Fab, wherein in the CL domain adjacent to the TNF ligand family member the amino acid at position 123 (EU numbering) has been replaced by arginine (R) and the amino acid at position 124 (EU numbering) has been substituted by lysine (K), and wherein in the CH1 domain adjacent to the TNF ligand family member the amino acids at position 147 (EU numbering) and at position 213 (EU numbering) have been substituted by glutamic acid (E). 
     Polynucleotides 
     The invention further provides isolated polynucleotides encoding a bispecific antibody as described herein or a fragment thereof. 
     The isolated polynucleotides encoding the antibodies of the invention may be expressed as a single polynucleotide that encodes the entire antigen binding molecule or as multiple (e.g., two or more) polynucleotides that are co-expressed. Polypeptides encoded by polynucleotides that are co-expressed may associate through, e.g., disulfide bonds or other means to form a functional antigen binding molecule. For example, the light chain portion of an immunoglobulin may be encoded by a separate polynucleotide from the heavy chain portion of the immunoglobulin. When co-expressed, the heavy chain polypeptides will associate with the light chain polypeptides to form the immunoglobulin. 
     In some aspects, the isolated polynucleotide encodes the entire antibody according to the invention as described herein. In other embodiments, the isolated polynucleotide encodes a polypeptide comprised in the antibody according to the invention as described herein. 
     In certain embodiments the polynucleotide or nucleic acid is DNA. In other embodiments, a polynucleotide of the present invention is RNA, for example, in the form of messenger RNA (mRNA). RNA of the present invention may be single stranded or double stranded. 
     Recombinant Methods 
     Bispecific antibodies as used in the invention may be obtained, for example, by solid-state peptide synthesis (e.g. Merrifield solid phase synthesis) or recombinant production. For recombinant production one or more polynucleotide encoding the antibody or polypeptide fragments thereof, e.g., as described above, is isolated and inserted into one or more vectors for further cloning and/or expression in a host cell. Such polynucleotide may be readily isolated and sequenced using conventional procedures. In one aspect of the invention, a vector, preferably an expression vector, comprising one or more of the polynucleotides of the invention is provided. Methods which are well known to those skilled in the art can be used to construct expression vectors containing the coding sequence of the antibody (fragment) along with appropriate transcriptional/translational control signals. These methods include in vitro recombinant DNA techniques, synthetic techniques and in vivo recombination/genetic recombination. See, for example, the techniques described in Maniatis et al., MOLECULAR CLONING: A LABORATORY MANUAL, Cold Spring Harbor Laboratory, N.Y. (1989); and Ausubel et al., CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, Greene Publishing Associates and Wiley Interscience, N.Y. (1989). The expression vector can be part of a plasmid, virus, or may be a nucleic acid fragment. The expression vector includes an expression cassette into which the polynucleotide encoding the antibody or polypeptide fragments thereof (i.e. the coding region) is cloned in operable association with a promoter and/or other transcription or translation control elements. As used herein, a “coding region” is a portion of nucleic acid which consists of codons translated into amino acids. Although a “stop codon” (TAG, TGA, or TAA) is not translated into an amino acid, it may be considered to be part of a coding region, if present, but any flanking sequences, for example promoters, ribosome binding sites, transcriptional terminators, introns, 5′ and 3′ untranslated regions, and the like, are not part of a coding region. Two or more coding regions can be present in a single polynucleotide construct, e.g. on a single vector, or in separate polynucleotide constructs, e.g. on separate (different) vectors. Furthermore, any vector may contain a single coding region, or may comprise two or more coding regions, e.g. a vector of the present invention may encode one or more polypeptides, which are post- or co-translationally separated into the final proteins via proteolytic cleavage. In addition, a vector, polynucleotide, or nucleic acid of the invention may encode heterologous coding regions, either fused or unfused to a polynucleotide encoding the antibody of the invention or polypeptide fragments thereof, or variants or derivatives thereof. Heterologous coding regions include without limitation specialized elements or motifs, such as a secretory signal peptide or a heterologous functional domain. An operable association is when a coding region for a gene product, e.g. a polypeptide, is associated with one or more regulatory sequences in such a way as to place expression of the gene product under the influence or control of the regulatory sequence(s). Two DNA fragments (such as a polypeptide coding region and a promoter associated therewith) are “operably associated” if induction of promoter function results in the transcription of mRNA encoding the desired gene product and if the nature of the linkage between the two DNA fragments does not interfere with the ability of the expression regulatory sequences to direct the expression of the gene product or interfere with the ability of the DNA template to be transcribed. Thus, a promoter region would be operably associated with a nucleic acid encoding a polypeptide if the promoter was capable of effecting transcription of that nucleic acid. The promoter may be a cell-specific promoter that directs substantial transcription of the DNA only in predetermined cells. Other transcription control elements, besides a promoter, for example enhancers, operators, repressors, and transcription termination signals, can be operably associated with the polynucleotide to direct cell-specific transcription. 
     Suitable promoters and other transcription control regions are disclosed herein. A variety of transcription control regions are known to those skilled in the art. These include, without limitation, transcription control regions, which function in vertebrate cells, such as, but not limited to, promoter and enhancer segments from cytomegaloviruses (e.g. the immediate early promoter, in conjunction with intron-A), simian virus 40 (e.g. the early promoter), and retroviruses (such as, e.g. Rous sarcoma virus). Other transcription control regions include those derived from vertebrate genes such as actin, heat shock protein, bovine growth hormone and rabbit a-globin, as well as other sequences capable of controlling gene expression in eukaryotic cells. Additional suitable transcription control regions include tissue-specific promoters and enhancers as well as inducible promoters (e.g. promoters inducible tetracyclins). Similarly, a variety of translation control elements are known to those of ordinary skill in the art. These include, but are not limited to ribosome binding sites, translation initiation and termination codons, and elements derived from viral systems (particularly an internal ribosome entry site, or IRES, also referred to as a CITE sequence). The expression cassette may also include other features such as an origin of replication, and/or chromosome integration elements such as retroviral long terminal repeats (LTRs), or adeno-associated viral (AAV) inverted terminal repeats (ITRs). 
     Polynucleotide and nucleic acid coding regions of the present invention may be associated with additional coding regions which encode secretory or signal peptides, which direct the secretion of a polypeptide encoded by a polynucleotide of the present invention. For example, if secretion of the antibody or polypeptide fragments thereof is desired, DNA encoding a signal sequence may be placed upstream of the nucleic acid an antibody of the invention or polypeptide fragments thereof. According to the signal hypothesis, proteins secreted by mammalian cells have a signal peptide or secretory leader sequence which is cleaved from the mature protein once export of the growing protein chain across the rough endoplasmic reticulum has been initiated. Those of ordinary skill in the art are aware that polypeptides secreted by vertebrate cells generally have a signal peptide fused to the N-terminus of the polypeptide, which is cleaved from the translated polypeptide to produce a secreted or “mature” form of the polypeptide. In certain embodiments, the native signal peptide, e.g. an immunoglobulin heavy chain or light chain signal peptide is used, or a functional derivative of that sequence that retains the ability to direct the secretion of the polypeptide that is operably associated with it. Alternatively, a heterologous mammalian signal peptide, or a functional derivative thereof, may be used. For example, the wild-type leader sequence may be substituted with the leader sequence of human tissue plasminogen activator (TPA) or mouse β-glucuronidase. 
     DNA encoding a short protein sequence that could be used to facilitate later purification (e.g. a histidine tag) or assist in labeling the fusion protein may be included within or at the ends of the polynucleotide encoding an antibody of the invention or polypeptide fragments thereof. 
     In a further aspect of the invention, a host cell comprising one or more polynucleotides of the invention is provided. In certain embodiments a host cell comprising one or more vectors of the invention is provided. The polynucleotides and vectors may incorporate any of the features, singly or in combination, described herein in relation to polynucleotides and vectors, respectively. In one aspect, a host cell comprises (e.g. has been transformed or transfected with) a vector comprising a polynucleotide that encodes (part of) an antibody of the invention of the invention. As used herein, the term “host cell” refers to any kind of cellular system which can be engineered to generate the fusion proteins of the invention or fragments thereof. Host cells suitable for replicating and for supporting expression of antigen binding molecules are well known in the art. Such cells may be transfected or transduced as appropriate with the particular expression vector and large quantities of vector containing cells can be grown for seeding large scale fermenters to obtain sufficient quantities of the antigen binding molecule for clinical applications. Suitable host cells include prokaryotic microorganisms, such as  E. coli,  or various eukaryotic cells, such as Chinese hamster ovary cells (CHO), insect cells, or the like. For example, polypeptides may be produced in bacteria in particular when glycosylation is not needed. After expression, the polypeptide may be isolated from the bacterial cell paste in a soluble fraction and can be further purified. In addition to prokaryotes, eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for polypeptide-encoding vectors, including fungi and yeast strains whose glycosylation pathways have been “humanized”, resulting in the production of a polypeptide with a partially or fully human glycosylation pattern. See Gerngross, Nat Biotech 22, 1409-1414 (2004), and Li et al., Nat Biotech 24, 210-215 (2006). 
     Suitable host cells for the expression of (glycosylated) polypeptides are also derived from multicellular organisms (invertebrates and vertebrates). Examples of invertebrate cells include plant and insect cells. Numerous baculoviral strains have been identified which may be used in conjunction with insect cells, particularly for transfection of  Spodoptera frugiperda  cells. Plant cell cultures can also be utilized as hosts. See e.g. U.S. Pat. Nos. 5,959,177, 6,040,498, 6,420,548, 7,125,978, and 6,417,429 (describing PLANTIBODIES™ technology for producing antibodies in transgenic plants). Vertebrate cells may also be used as hosts. For example, mammalian cell lines that are adapted to grow in suspension may be useful. Other examples of useful mammalian host cell lines are monkey kidney CV1 line transformed by SV40 (COS-7); human embryonic kidney line (293 or 293T cells as described, e.g., in Graham et al., J Gen Virol 36, 59 (1977)), baby hamster kidney cells (BHK), mouse sertoli cells (TM4 cells as described, e.g., in Mather, Biol Reprod 23, 243-251 (1980)), monkey kidney cells (CV1), African green monkey kidney cells (VERO-76), human cervical carcinoma cells (HELA), canine kidney cells (MDCK), buffalo rat liver cells (BRL 3A), human lung cells (W138), human liver cells (Hep G2), mouse mammary tumor cells (MMT 060562), TRI cells (as described, e.g., in Mather et al., Annals N.Y. Acad Sci 383, 44-68 (1982)), MRC 5 cells, and FS4 cells. Other useful mammalian host cell lines include Chinese hamster ovary (CHO) cells, including dhfr− CHO cells (Urlaub et al., Proc Natl Acad Sci USA 77, 4216 (1980)); and myeloma cell lines such as YO, NS0, P3X63 and Sp2/0. For a review of certain mammalian host cell lines suitable for protein production, see, e.g., Yazaki and Wu, Methods in Molecular Biology, Vol. 248 (B.K.C. Lo, ed., Humana Press, Totowa, N.J.), pp. 255-268 (2003). Host cells include cultured cells, e.g., mammalian cultured cells, yeast cells, insect cells, bacterial cells and plant cells, to name only a few, but also cells comprised within a transgenic animal, transgenic plant or cultured plant or animal tissue. In one embodiment, the host cell is a eukaryotic cell, preferably a mammalian cell, such as a Chinese Hamster Ovary (CHO) cell, a human embryonic kidney (HEK) cell or a lymphoid cell (e.g., Y0, NS0, Sp20 cell). Standard technologies are known in the art to express foreign genes in these systems. Cells expressing a polypeptide comprising either the heavy or the light chain of an immunoglobulin, may be engineered so as to also express the other of the immunoglobulin chains such that the expressed product is an immunoglobulin that has both a heavy and a light chain. 
     In one aspect, a method of producing an antibody of the invention or polypeptide fragments thereof is provided, wherein the method comprises culturing a host cell comprising polynucleotides encoding the antibody of the invention or polypeptide fragments thereof, as provided herein, under conditions suitable for expression of the antibody of the invention or polypeptide fragments thereof, and recovering the antibody of the invention or polypeptide fragments thereof from the host cell (or host cell culture medium). 
     In certain embodiments the moieties capable of specific binding to a target cell antigen (e.g. Fab fragments) forming part of the antigen binding molecule comprise at least an immunoglobulin variable region capable of binding to an antigen. Variable regions can form part of and be derived from naturally or non-naturally occurring antibodies and fragments thereof. Methods to produce polyclonal antibodies and monoclonal antibodies are well known in the art (see e.g. Harlow and Lane, “Antibodies, a laboratory manual”, Cold Spring Harbor Laboratory, 1988). Non-naturally occurring antibodies can be constructed using solid phase-peptide synthesis, can be produced recombinantly (e.g. as described in U.S. Pat. No. 4,186,567) or can be obtained, for example, by screening combinatorial libraries comprising variable heavy chains and variable light chains (see e.g. U.S. Pat. No. 5,969,108 to McCafferty). 
     Any animal species of immunoglobulin can be used in the invention. Non-limiting immunoglobulins useful in the present invention can be of murine, primate, or human origin. If the fusion protein is intended for human use, a chimeric form of immunoglobulin may be used wherein the constant regions of the immunoglobulin are from a human. A humanized or fully human form of the immunoglobulin can also be prepared in accordance with methods well known in the art (see e. g. U.S. Pat. No. 5,565,332 to Winter). Humanization may be achieved by various methods including, but not limited to (a) grafting the non-human (e.g., donor antibody) CDRs onto human (e.g. recipient antibody) framework and constant regions with or without retention of critical framework residues (e.g. those that are important for retaining good antigen binding affinity or antibody functions), (b) grafting only the non-human specificity-determining regions (SDRs or a-CDRs; the residues critical for the antibody-antigen interaction) onto human framework and constant regions, or (c) transplanting the entire non-human variable domains, but “cloaking” them with a human-like section by replacement of surface residues. Humanized antibodies and methods of making them are reviewed, e.g., in Almagro and Fransson, Front Biosci 13, 1619-1633 (2008), and are further described, e.g., in Riechmann et al., Nature 332, 323-329 (1988); Queen et al., Proc Natl Acad Sci USA 86, 10029-10033 (1989); U.S. Pat. Nos. 5,821,337, 7,527,791, 6,982,321, and 7,087,409; Jones et al., Nature 321, 522-525 (1986); Morrison et al., Proc Natl Acad Sci 81, 6851-6855 (1984); Morrison and Oi, Adv Immunol 44, 65-92 (1988); Verhoeyen et al., Science 239, 1534-1536 (1988); Padlan, Molec Immun 31(3), 169-217 (1994); Kashmiri et al., Methods 36, 25-34 (2005) (describing SDR (a-CDR) grafting); Padlan, Mol Immunol 28, 489-498 (1991) (describing “resurfacing”); Dall&#39;Acqua et al., Methods 36, 43-60 (2005) (describing “FR shuffling”); and Osboum et al., Methods 36, 61-68 (2005) and Klimka et al., Br J Cancer 83, 252-260 (2000) (describing the “guided selection” approach to FR shuffling). Particular immunoglobulins according to the invention are human immunoglobulins. Human antibodies and human variable regions can be produced using various techniques known in the art. Human antibodies are described generally in van Dijk and van de Winkel, Curr Opin Pharmacol 5, 368-74 (2001) and Lonberg, Curr Opin Immunol 20, 450-459 (2008). Human variable regions can form part of and be derived from human monoclonal antibodies made by the hybridoma method (see e.g. Monoclonal Antibody Production Techniques and Applications, pp. 51-63 (Marcel Dekker, Inc., New York, 1987)). Human antibodies and human variable regions may also be prepared by administering an immunogen to a transgenic animal that has been modified to produce intact human antibodies or intact antibodies with human variable regions in response to antigenic challenge (see e.g. Lonberg, Nat Biotech 23, 1117-1125 (2005). Human antibodies and human variable regions may also be generated by isolating Fv clone variable region sequences selected from human-derived phage display libraries (see e.g., Hoogenboom et al. in Methods in Molecular Biology 178, 1-37 (O&#39;Brien et al., ed., Human Press, Totowa, N.J., 2001); and McCafferty et al., Nature 348, 552-554; Clackson et al., Nature 352, 624-628 (1991)). Phage typically display antibody fragments, either as single-chain Fv (scFv) fragments or as Fab fragments. 
     In certain aspects, the antibodies are engineered to have enhanced binding affinity according to, for example, the methods disclosed in PCT publication WO 2012/020006 (see Examples relating to affinity maturation) or U.S. Pat. Appl. Publ. No. 2004/0132066. The ability of the antigen binding molecules of the invention to bind to a specific antigenic determinant can be measured either through an enzyme-linked immunosorbent assay (ELISA) or other techniques familiar to one of skill in the art, e.g. surface plasmon resonance technique (Liljeblad, et al., Glyco J 17, 323-329 (2000)), and traditional binding assays (Heeley, Endocr Res 28, 217-229 (2002)). Competition assays may be used to identify an antigen binding molecule that competes with a reference antibody for binding to a particular antigen. In certain embodiments, such a competing antigen binding molecule binds to the same epitope (e.g. a linear or a conformational epitope) that is bound by the reference antigen binding molecule. Detailed exemplary methods for mapping an epitope to which an antigen binding molecule binds are provided in Morris (1996) “Epitope Mapping Protocols”, in Methods in Molecular Biology vol. 66 (Humana Press, Totowa, N.J.). In an exemplary competition assay, immobilized antigen is incubated in a solution comprising a first labeled antigen binding molecule that binds to the antigen and a second unlabeled antigen binding molecule that is being tested for its ability to compete with the first antigen binding molecule for binding to the antigen. The second antigen binding molecule may be present in a hybridoma supernatant. As a control, immobilized antigen is incubated in a solution comprising the first labeled antigen binding molecule but not the second unlabeled antigen binding molecule. After incubation under conditions permissive for binding of the first antibody to the antigen, excess unbound antibody is removed, and the amount of label associated with immobilized antigen is measured. If the amount of label associated with immobilized antigen is substantially reduced in the test sample relative to the control sample, then that indicates that the second antigen binding molecule is competing with the first antigen binding molecule for binding to the antigen. See Harlow and Lane (1988) Antibodies: A Laboratory Manual ch. 14 (Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y.). 
     Antibodies of the invention prepared as described herein may be purified by art-known techniques such as high performance liquid chromatography, ion exchange chromatography, gel electrophoresis, affinity chromatography, size exclusion chromatography, and the like. The actual conditions used to purify a particular protein will depend, in part, on factors such as net charge, hydrophobicity, hydrophilicity etc., and will be apparent to those having skill in the art. For affinity chromatography purification an antibody, ligand, receptor or antigen can be used to which the antigen binding molecule binds. For example, for affinity chromatography purification of fusion proteins of the invention, a matrix with protein A or protein G may be used. Sequential Protein A or G affinity chromatography and size exclusion chromatography can be used to isolate an antigen binding molecule essentially as described in the Examples. The purity of the antigen binding molecule or fragments thereof can be determined by any of a variety of well-known analytical methods including gel electrophoresis, high pressure liquid chromatography, and the like. For example, the 4-1BBL-containing antigen binding molecules expressed as described in the Examples were shown to be intact and properly assembled as demonstrated by reducing and non-reducing SDS-PAGE. 
     Assays 
     The antigen binding molecules provided herein may be identified, screened for, or characterized for their physical/chemical properties and/or biological activities by various assays known in the art. 
     1. Affinity assays 
     The affinity of the bispecific antigen binding molecules provided herein for the corresponding receptor can be determined in accordance with the methods set forth in the Examples by surface plasmon resonance (SPR), using standard instrumentation such as a BIAcore instrument (GE Healthcare), and receptors or target proteins such as may be obtained by recombinant expression. The affinity of the bispecific antigen binding molecule for the target cell antigen can also be determined by surface plasmon resonance (SPR), using standard instrumentation such as a BIAcore instrument (GE Healthcare), and receptors or target proteins such as may be obtained by recombinant expression. For the CD19-4-1BBL antigen binding molecules the methods have been described in more detail in International Patent Appl. Publ. No. WO 2016/075278 A1. According to one aspect, KD is measured by surface plasmon resonance using a BIACORE® T100 machine (GE Healthcare) at 25° C. 
     2. Binding Assays and Other Assays 
     In one aspect, the CD19-4-1BBL antigen binding molecules as reported herein are tested for its antigen binding activity as described in more detail in Example 2. 
     3. Activity Assays 
     In one aspect, assays are provided for identifying the biological activity of CD19-4-1BBL antigen binding molecules. Biological activity may include, e.g., inhibition of B-cell proliferation or killing of B-cells. Antibodies having such biological activity in vivo and/or in vitro are also provided. For the CD19-4-1BBL antigen binding molecules certain methods have been described in more detail in International Patent Appl. Publ. No. WO 2016/075278 A1. 
     In certain embodiments, an antibody as reported herein is tested for such biological activity. 
     Pharmaceutical Compositions, Formulations and Routes of Administration 
     In a further aspect, the invention provides pharmaceutical compositions comprising the 4-1BB agonists comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibodies provided herein, e.g., for use in any of the below therapeutic methods. In one aspect, the pharmaceutical composition comprises a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, provided herein and at least one pharmaceutically acceptable excipient, and a second medicament comprising an anti-CD20 antibody. In another embodiment, a pharmaceutical composition comprises a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, provided herein, and at least one pharmaceutically acceptable excipient, a second medicament comprising an anti-CD20 antibody and at least one additional therapeutic agent, e.g., as described below. 
     Pharmaceutical compositions of the present invention comprise a therapeutically effective amount of one or more antigen binding molecules described herein dissolved or dispersed in a pharmaceutically acceptable excipient. The phrases “pharmaceutical or pharmacologically acceptable” refers to molecular entities and compositions that are generally non-toxic to recipients at the dosages and concentrations employed, i.e. do not produce an adverse, allergic or other untoward reaction when administered to an animal, such as, for example, a human, as appropriate. The preparation of a pharmaceutical composition that contains at least one antibody and optionally an additional active ingredient will be known to those of skill in the art in light of the present disclosure, as exemplified by Remington&#39;s Pharmaceutical Sciences, 18th Ed. Mack Printing Company, 1990, incorporated herein by reference. In particular, the compositions are lyophilized formulations or aqueous solutions. As used herein, “pharmaceutically acceptable excipient” includes any and all solvents, buffers, dispersion media, coatings, surfactants, antioxidants, preservatives (e.g. antibacterial agents, antifungal agents), isotonic agents, salts, stabilizers and combinations thereof, as would be known to one of ordinary skill in the art. 
     Parenteral compositions include those designed for administration by injection, e.g. subcutaneous, intradermal, intralesional, intravenous, intraarterial intramuscular, intrathecal or intraperitoneal injection. For injection, the antigen binding molecules of the invention may be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks&#39; solution, Ringer&#39;s solution, or physiological saline buffer. The solution may contain formulatory agents such as suspending, stabilizing and/or dispersing agents. Alternatively, the fusion proteins may be in powder form for constitution with a suitable vehicle, e.g., sterile pyrogen-free water, before use. Sterile injectable solutions are prepared by incorporating the fusion proteins of the invention in the required amount in the appropriate solvent with various of the other ingredients enumerated below, as required. Sterility may be readily accomplished, e.g., by filtration through sterile filtration membranes. Generally, dispersions are prepared by incorporating the various sterilized active ingredients into a sterile vehicle which contains the basic dispersion medium and/or the other ingredients. In the case of sterile powders for the preparation of sterile injectable solutions, suspensions or emulsion, the preferred methods of preparation are vacuum-drying or freeze-drying techniques which yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered liquid medium thereof. The liquid medium should be suitably buffered if necessary and the liquid diluent first rendered isotonic prior to injection with sufficient saline or glucose. The composition must be stable under the conditions of manufacture and storage, and preserved against the contaminating action of microorganisms, such as bacteria and fungi. It will be appreciated that endotoxin contamination should be kept minimally at a safe level, for example, less that 0.5 ng/mg protein. Suitable pharmaceutically acceptable excipients include, but are not limited to: buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid and methionine; preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride; benzethonium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol; 3-pentanol; and m-cresol); low molecular weight (less than about 10 residues) polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, histidine, arginine, or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugars such as sucrose, mannitol, trehalose or sorbitol; salt-forming counter-ions such as sodium; metal complexes (e.g. Zn-protein complexes); and/or non-ionic surfactants such as polyethylene glycol (PEG). Aqueous injection suspensions may contain compounds which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, dextran, or the like. Optionally, the suspension may also contain suitable stabilizers or agents which increase the solubility of the compounds to allow for the preparation of highly concentrated solutions. Additionally, suspensions of the active compounds may be prepared as appropriate oily injection suspensions. Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl cleats or triglycerides, or liposomes. 
     Active ingredients may be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsules and poly-(methylmethacylate) microcapsules, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules) or in macroemulsions. Such techniques are disclosed in Remington&#39;s Pharmaceutical Sciences (18th Ed. Mack Printing Company, 1990). Sustained-release preparations may be prepared. Suitable examples of sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the polypeptide, which matrices are in the form of shaped articles, e.g. films, or microcapsules. In particular embodiments, prolonged absorption of an injectable composition can be brought about by the use in the compositions of agents delaying absorption, such as, for example, aluminum monostearate, gelatin or combinations thereof. 
     Exemplary pharmaceutically acceptable excipients herein further include insterstitial drug dispersion agents such as soluble neutral-active hyaluronidase glycoproteins (sHASEGP), for example, human soluble PH-20 hyaluronidase glycoproteins, such as rHuPH20 (HYLENEX®, Baxter International, Inc.). Certain exemplary sHASEGPs and methods of use, including rHuPH20, are described in US Patent Publication Nos. 2005/0260186 and 2006/0104968. In one aspect, a sHASEGP is combined with one or more additional glycosaminoglycanases such as chondroitinases. 
     Exemplary lyophilized antibody formulations are described in U.S. Pat. No. 6,267,958. Aqueous antibody formulations include those described in U.S. Pat. No. 6,171,586 and WO2006/044908, the latter formulations including a histidine-acetate buffer. 
     In addition to the compositions described previously, the antibodies may also be formulated as a depot preparation. Such long acting formulations may be administered by implantation (for example subcutaneously or intramuscularly) or by intramuscular injection. Thus, for example, the fusion proteins may be formulated with suitable polymeric or hydrophobic materials (for example as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt. 
     Pharmaceutical compositions comprising the antigen binding molecules of the invention may be manufactured by means of conventional mixing, dissolving, emulsifying, encapsulating, entrapping or lyophilizing processes. Pharmaceutical compositions may be formulated in conventional manner using one or more physiologically acceptable carriers, diluents, excipients or auxiliaries which facilitate processing of the proteins into preparations that can be used pharmaceutically. Proper formulation is dependent upon the route of administration chosen. 
     The 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 provided herein may be formulated into a composition in a free acid or base, neutral or salt form. Pharmaceutically acceptable salts are salts that substantially retain the biological activity of the free acid or base. These include the acid addition salts, e.g. those formed with the free amino groups of a proteinaceous composition, or which are formed with inorganic acids such as for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric or mandelic acid. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as for example, sodium, potassium, ammonium, calcium or ferric hydroxides; or such organic bases as isopropylamine, trimethylamine, histidine or procaine. Pharmaceutical salts tend to be more soluble in aqueous and other protic solvents than are the corresponding free base forms. 
     The composition herein may also contain more than one active ingredients as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other. Such active ingredients are suitably present in combination in amounts that are effective for the purpose intended. 
     In one aspect, there is provided a pharmaceutical composition comprising 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and a pharmaceutically acceptable excipient, and a second medicament comprising an anti-CD20 antibody as described herein. In a particular aspect, the pharmaceutical composition is for use in the treatment of B-cell proliferative disorders, in particular a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     The formulations to be used for in vivo administration are generally sterile. Sterility may be readily accomplished, e.g., by filtration through sterile filtration membranes. 
     Administration of the 4-1BB Agonist Comprising at Least One Antigen Binding Domain Capable of Specific Binding to CD19 Provided herein and the anti-CD20 Antibody 
     Both the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and the anti-CD20 antibody (both called substance herein) can be administered by any suitable means, including parenteral, intrapulmonary, and intranasal, and, if desired for local treatment, intralesional administration. The methods of the present invention are particularly useful, however, in relation to therapeutic agents administered by parenteral, particularly intravenous, infusion. 
     Parenteral infusions include intramuscular, intravenous, intraarterial, intraperitoneal, or subcutaneous administration. Dosing can be by any suitable route, e.g. by injections, such as intravenous or subcutaneous injections, depending in part on whether the administration is brief or chronic. Various dosing schedules including but not limited to single or multiple administrations over various time-points, bolus administration, and pulse infusion are contemplated herein. In one embodiment, the therapeutic agent is administered parenterally, particularly intravenously. In a particular embodiment, the substance is administered by intravenous infusion. In another aspect, the substance is administered subcutaneously. 
     Both the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody would be formulated, dosed, and administered in a fashion consistent with good medical practice. Factors for consideration in this context include the particular disorder being treated, the particular mammal being treated, the clinical condition of the individual patient, the cause of the disorder, the site of delivery of the agent, the method of administration, the scheduling of administration, and other factors known to medical practitioners. Both the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody need not be, but are optionally formulated with one or more agents currently used to prevent or treat the disorder in question. The effective amount of such other agents depends on the amount of therapeutic agent present in the formulation, the type of disorder or treatment, and other factors discussed above. These are generally used in the same dosages and with administration routes as described herein, or about from 1 to 99% of the dosages described herein, or in any dosage and by any route that is empirically/clinically determined to be appropriate. 
     For the prevention or treatment of disease, the appropriate dosage of 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, provided herein and the ant-CD20 antibody (when used in their combination or with one or more other additional therapeutic agents) will depend on the type of disease to be treated, the type of 4-1BB agent, the severity and course of the disease, whether both agents are administered for preventive or therapeutic purposes, previous therapy, the patient&#39;s clinical history and response to the therapeutic agent, and the discretion of the attending physician. Each substance is suitably administered to the patient at one time or over a series of treatments. Depending on the type and severity of the disease, about 1 μg/kg to 15 mg/kg (e.g. 0.1 mg/kg-10 mg/kg) of the substance can be an initial candidate dosage for administration to the subject, whether, for example, by one or more separate administrations, or by continuous infusion. One typical daily dosage might range from about 1 μg/kg to 100 mg/kg or more, depending on the factors mentioned above. For repeated administrations over several days or longer, depending on the condition, the treatment would generally be sustained until a desired suppression of disease symptoms occurs. One exemplary dosage of each substance would be in the range from about 0.05 mg/kg to about 10 mg/kg. Thus, one or more doses of about 0.5 mg/kg, 2.0 mg/kg, 4.0 mg/kg or 10 mg/kg (or any combination thereof) may be administered to the subject. Such doses may be administered intermittently, e.g. every week, every two weeks, or every three weeks (e.g. such that the subject receives from about two to about twenty, or e.g. about six doses of the therapeutic agent). An initial higher loading dose, followed by one or more lower doses, or an initial lower dose, followed by one or more higher doses may be administered. An exemplary dosing regimen comprises administering an initial dose of about 10 mg, followed by a bi-weekly dose of about 20 mg of the therapeutic agent. However, other dosage regimens may be useful. The progress of this therapy is easily monitored by conventional techniques and assays. 
     In one aspect, the administration of both the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody is a single administration. In certain aspects, the administration of the substance is two or more administrations. In one such aspect, the substances are administered every week, every two weeks, or every three weeks, particularly every two weeks. In one aspect, the substance is administered in a therapeutically effective amount. In one aspect the substance is administered at a dose of about 50 μg/kg, about 100 μg/kg, about 200 μg/kg, about 300 μg/kg, about 400 μg/kg, about 500 μg/kg, about 600 μg/kg, about 700 μg/kg, about 800 μg/kg, about 900 μg/kg or about 1000 μg/kg. In one embodiment, the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, is administered at a dose which is higher than the dose of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, in a corresponding treatment regimen without the administration of the anti-CD20 antibody. In one aspect, the administration of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, provided herein comprises an initial administration of a first dose of the the anti-CD20 antibody, and one or more subsequent administrations of a second dose of the anti-CD20 antibody, wherein the second dose is higher than the first dose. In one aspect, the administration of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, comprises an initial administration of a first dose of the anti-CD20 antibody, and one or more subsequent administrations of a second dose of the anti-CD20 antibody, wherein the first dose is not lower than the second dose. 
     In one aspect, the administration of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, in the treatment regimen according to the invention is the first administration of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 to the subject (at least within the same course of treatment). In one aspect, no administration of the anti-CD20 antibody is made to the subject prior to the administration of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP. In another aspect, the anti-CD20 antibody is administered prior to the administration of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP. 
     In another aspect, the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, is for use in combination with an anti-CD20 antibody, wherein a pretreatment with an Type II anti-CD20 antibody, preferably obinutuzumab, is performed prior to the combination treatment, wherein the period of time between the pretreatment and the combination treatment is sufficient for the reduction of B-cells in the individual in response to the Type II anti-CD20 antibody, preferably obinutuzumab. 
     Activation of T cells can lead to severe cytokine release syndrome (CRS). In a phase 1 study conducted by TeGenero (Suntharalingam et al., N Engl J Med (2006) 355, 1018-1028), all 6 healthy volunteers experienced near fatal, severe cytokine release syndrome (CRS) rapidly post-infusion of an inappropriately-dosed, T-cell stimulating super-agonist anti-CD28 monoclonal antibody. The cytokine release associated with administration of a T-cell activating therapeutic agent, such as the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, to a subject can be significantly reduced by pre-treatment of said subject with a Type II anti-CD20 antibody, such as obinutuzumab. the use of GAZYVA® pre-treatment (Gpt) should aid in the rapid depletion of B cells, both in the peripheral blood and in secondary lymphoid organs, such that the risk of highly relevant adverse events (AEs) from strong systemic T cell activation by T-cell activating therapeutic agents (e.g. CRS) is reduced, while supporting exposure levels of T-cell activating therapeutic agents that are high enough from the start of dosing to mediate tumour cell elimination. To date, the safety profile of obinutuzumab (including cytokine release) has been assessed and managed in hundreds of patients in ongoing obinutuzumab clinical trials. Finally, in addition to supporting the safety profile of 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, provided herein, Gpt should also help prevent the formation of anti-drug antibodies (ADAs) to these unique molecules. 
     In the present invention, the combination of the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody can be used in combination with one or more further agents in a therapy. For instance, at least one additional therapeutic agent may be co-administered. In certain aspects, an additional therapeutic agent is an immunotherapeutic agent. 
     Such combination therapies noted above encompass combined administration (where two or more therapeutic agents are included in the same or separate formulations), and separate administration, in which case, administration of the therapeutic agent can occur prior to, simultaneously, and/or following, administration of an additional therapeutic agent or agents. In one embodiment, administration of the therapeutic agent and administration of an additional therapeutic agent occur within about one month, or within about one, two or three weeks, or within about one, two, three, four, five, or six days, of each other. 
     Therapeutic Methods and Compositions 
     CD20 and CD19 are expressed on most B-cells (pan-B-cell marker) with the exception of stem cells and plasma cells, and are frequently expressed on most human B-cell malignancies (tumor associated antigen), such as lymphoma and leukemias except for multiple myeloma, e.g. in non-Hodgkin lymphoma and acute lymphoblastic leukemia. 
     Bispecific molecules recognizing two cell surface proteins on different cell populations hold the promise to redirect cytotoxic immune cells for destruction of pathogenic target cells. 
     In one aspect, there is provided a method for treating or delaying progression of cancer in a subject comprising administering to the subject an effective amount of a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and an anti-CD20 antibody. 
     In one such aspect, the method further comprises administering to the subject an effective amount of at least one additional therapeutic agent. In further aspects, herein is provided a method for depleting B-cells comprising administering to the subject an effective amount of a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 provided herein and an anti-CD20 antibody. An “individual” or a “subject” according to any of the above aspects is preferably a human. 
     In further aspects, a composition for use in cancer immunotherapy is provided comprising a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 provided herein and an anti-CD20 antibody. In certain aspects, a composition comprising a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 provided herein and an anti-CD20 antibody for use in a method of cancer immunotherapy is provided. 
     In a further aspect, herein is provided the use of a composition comprising a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 provided herein and an anti-CD20 antibody in the manufacture or preparation of a medicament. In one embodiment, the medicament is for treatment of a B-cell proliferative disorder. In a further embodiment, the medicament is for use in a method of treating a B-cell proliferative disorder comprising administering to an individual having a B-cell proliferative disorder an effective amount of the medicament. In one such embodiment, the method further comprises administering to the individual an effective amount of at least one additional therapeutic agent. In a further embodiment, the medicament is for depleting B-cells. B-cell proliferative disorders are selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). In one particular aspect, the B-cell cancer is non-Hodgkin lymphoma or acute lymphoblastic leukemia. 
     In a further aspect, herein is provided a method for treating a B-cell cancer. In one embodiment, the method comprises administering to an individual having such B-cell cancer an effective amount of an anti-human CD20 antibody. In one such embodiment, the method further comprises administering to the individual an effective amount of at least one additional therapeutic agent, as described below. An “individual” according to any of the above embodiments may be a human. The B-cell cancer is in one embodiment a B-cell lymphoma or a B-cell leukemia. In one embodiment the B-cell cancer is non-Hodgkin lymphoma or acute lymphoblastic leukemia. 
     The combination therapies noted above encompass combined administration (where two or more therapeutic agents are included in the same or separate formulations), and separate administration, in which case, administration of the antibody as reported herein can occur prior to, simultaneously, and/or following, administration of the additional therapeutic agent or agents. In one embodiment, administration of the anti-human CD20 antibody and administration of an additional therapeutic agent occur within about one month, or within about one, two or three weeks, or within about one, two, three, four, five, or six days, of each other. 
     Both the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and the anti-CD20 antibody as reported herein (and any additional therapeutic agent) can be administered by any suitable means, including parenteral, intrapulmonary, and intranasal, and, if desired for local treatment, intralesional administration. Parenteral infusions include intramuscular, intravenous, intraarterial, intraperitoneal, or subcutaneous administration. Dosing can be by any suitable route, e.g. by injections, such as intravenous or subcutaneous injections, depending in part on whether the administration is brief or chronic. Various dosing schedules including but not limited to single or multiple administrations over various time-points, bolus administration, and pulse infusion are contemplated herein. 
     Both the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and the anti-CD20 antibody as reported herein would be formulated, dosed, and administered in a fashion consistent with good medical practice. Factors for consideration in this context include the particular disorder being treated, the particular mammal being treated, the clinical condition of the individual patient, the cause of the disorder, the site of delivery of the agent, the method of administration, the scheduling of administration, and other factors known to medical practitioners. The antibodies need not be, but are optionally formulated with one or more agents currently used to prevent or treat the disorder in question. The effective amount of such other agents depends on the amount of antibodies present in the formulation, the type of disorder or treatment, and other factors discussed above. These are generally used in the same dosages and with administration routes as described herein, or about from 1 to 99% of the dosages described herein, or in any dosage and by any route that is empirically/clinically determined to be appropriate. 
     Other Agents and Treatments 
     The antigen binding molecules of the invention may be administered in combination with one or more other agents in therapy. For instance, a fusion protein of the invention may be co-administered with at least one additional therapeutic agent. The term “therapeutic agent” encompasses any agent that can be administered for treating a symptom or disease in an individual in need of such treatment. Such additional therapeutic agent may comprise any active ingredients suitable for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other. In certain embodiments, an additional therapeutic agent is another anti-cancer agent. 
     Such other agents are suitably present in combination in amounts that are effective for the purpose intended. The effective amount of such other agents depends on the amount of fusion protein used, the type of disorder or treatment, and other factors discussed above. The antigen binding molecules are generally used in the same dosages and with administration routes as described herein, or about from 1 to 99% of the dosages described herein, or in any dosage and by any route that is empirically/clinically determined to be appropriate. 
     Such combination therapies noted above encompass combined administration (where two or more therapeutic agents are included in the same or separate compositions), and separate administration, in which case, administration of the antigen binding molecules of the invention can occur prior to, simultaneously, and/or following, administration of the additional therapeutic agent and/or adjuvant. 
     Articles of Manufacture (Kits) 
     In another aspect of the invention, a kit containing materials useful for the treatment, prevention and/or diagnosis of the disorders described above is provided. The kit comprises at least one container and a label or package insert on or associated with the container. Suitable containers include, for example, bottles, vials, syringes, IV solution bags, etc. The containers may be formed from a variety of materials such as glass or plastic. The container holds a composition which is by itself or combined with another composition effective for treating, preventing and/or diagnosing the condition and may have a sterile access port (for example the container may be an intravenous solution bag or a vial having a stopper that is pierceable by a hypodermic injection needle). At least two active agents in the kit are an anti-CD20/anti-CD3 bispecific antibody and a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, of the invention. 
     In a particular aspect, provided is a kit for treating or delaying progression of cancer in a subject, comprising a package comprising (A) a first composition comprising as active ingredient a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and a pharmaceutically acceptable excipient; (B) a second composition comprising as active ingredient an anti-CD20 antibody and a pharmaceutically acceptable excipient, and (C) instructions for using the compositions in a combination therapy. 
     The label or package insert indicates how the composition is used for treating the condition of choice and provides the instructions for using the compositions in a combination therapy. Moreover, the kit may comprise (a) a first container with a composition contained therein, wherein the composition comprises a 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, of the invention; and (b) a second container with a composition contained therein, wherein the composition comprises an anti-CD20 antibody. In addition, the kit may comprise one or more further containers comprising further active ingredients that can be used in combination. The article of manufacture in this embodiment of the invention may further comprise a package insert indicating that the compositions can be used to treat a particular condition. 
     Alternatively, or additionally, the kit may further comprise a second (or third) container comprising a pharmaceutically-acceptable buffer, such as bacteriostatic water for injection (BWFI), phosphate-buffered saline, Ringer&#39;s solution and dextrose solution. It may further include other materials desirable from a commercial and user standpoint, including other buffers, diluents, filters, needles, and syringes. 
     
       
         
           
               
             
               
                 TABLE D 
               
             
            
               
                   
               
               
                 (Sequences): 
               
            
           
           
               
               
               
            
               
                 SEQ 
                   
                   
               
               
                 ID NO: 
                 Name 
                 Sequence 
               
               
                   
               
            
           
           
               
               
               
            
               
                 1 
                 Human (hu) 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254) 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSE 
               
               
                   
               
               
                 2 
                 hu 4-1BBL (85-254) 
                 LDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSL 
               
               
                   
                   
                 TGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGE 
               
               
                   
                   
                 GSGSVSLALHLQPLRSAAGAAALALTVDLPPASSEA 
               
               
                   
                   
                 RNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQL 
               
               
                   
                   
                 TQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 3 
                 hu 4-1BBL (80-254) 
                 DPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGL 
               
               
                   
                   
                 AGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELRR 
               
               
                   
                   
                 VVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLPP 
               
               
                   
                   
                 ASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARAR 
               
               
                   
                   
                 HAWQLTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 4 
                 hu 4-1BBL (52-254) 
                 PWAVSGARASPGSAASPRLREGPELSPDDPAGLLDL 
               
               
                   
                   
                 RQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTGG 
               
               
                   
                   
                 LSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEGSG 
               
               
                   
                   
                 SVSLALHLQPLRSAAGAAALALTVDLPPASSEARNS 
               
               
                   
                   
                 AFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLTQG 
               
               
                   
                   
                 ATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 5 
                 Human (hu) 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-248) 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 6 
                 hu 4-1BBL (85-248) 
                 LDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSL 
               
               
                   
                   
                 TGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGE 
               
               
                   
                   
                 GSGSVSLALHLQPLRSAAGAAALALTVDLPPASSEA 
               
               
                   
                   
                 RNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQL 
               
               
                   
                   
                 TQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 7 
                 hu 4-1BBL (80-248) 
                 DPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGL 
               
               
                   
                   
                 AGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELRR 
               
               
                   
                   
                 VVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLPP 
               
               
                   
                   
                 ASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARAR 
               
               
                   
                   
                 HAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 8 
                 hu 4-1BBL (52-248) 
                 PWAVSGARASPGSAASPRLREGPELSPDDPAGLLDL 
               
               
                   
                   
                 RQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTGG 
               
               
                   
                   
                 LSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEGSG 
               
               
                   
                   
                 SVSLALHLQPLRSAAGAAALALTVDLPPASSEARNS 
               
               
                   
                   
                 AFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLTQG 
               
               
                   
                   
                 ATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 9 
                 CD19 (8B8-018) CDR-H1 
                 DYIMH 
               
               
                   
               
               
                 10 
                 CD19 (8B8-018) CDR-H2 
                 YINPYNDGSKYTEKFQG 
               
               
                   
               
               
                 11 
                 CD19 (8B8-018) CDR-H3 
                 GTYYYGSALFDY 
               
               
                   
               
               
                 12 
                 CD19 (8B8-018) CDR-L1 
                 KSSQSLENPNGNTYLN 
               
               
                   
               
               
                 13 
                 CD19 (8B8-018) CDR-L2 
                 RVSKRFS 
               
               
                   
               
               
                 14 
                 CD19 (8B8-018) CDR-L3 
                 LQLTHVPYT 
               
               
                   
               
               
                 15 
                 CD19 (8B8-2B11) CDR-H1 
                 DYIMH 
               
               
                   
               
               
                 16 
                 CD19 (8B8-2B11) CDR-H2 
                 YINPYNDGSKYTEKFQG 
               
               
                   
               
               
                 17 
                 CD19 (8B8-2B11) CDR-H3 
                 GTYYYGPQLFDY 
               
               
                   
               
               
                 18 
                 CD19 (8B8-2B11) CDR-L1 
                 KSSQSLETSTGTTYLN 
               
               
                   
               
               
                 19 
                 CD19 (8B8-2B11) CDR-L2 
                 RVSKRFS 
               
               
                   
               
               
                 20 
                 CD19 (8B8-2B11) CDR-L3 
                 LQLLEDPYT 
               
               
                   
               
               
                 21 
                 CD19 (8B8-018) VH 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                   
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                   
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                   
                 DYWGQGTTVTVSS 
               
               
                   
               
               
                 22 
                 CD19 (8B8-018) VL 
                 DIVMTQTPLSLSVTPGQPASISCKSSQSLENPNGNT 
               
               
                   
                   
                 YLNWYLQKPGQSPQLLIYRVSKRFSGVPDRFSGSGS 
               
               
                   
                   
                 GTDFTLKISRVEAEDVGVYYCLQLTHVPYTFGQGTK 
               
               
                   
                   
                 LEIK 
               
               
                   
               
               
                 23 
                 CD19 (8B8-2B11) VH 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                   
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                   
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                   
                 DYWGQGTTVTVSS 
               
               
                   
               
               
                 24 
                 CD19 (8B8-2B11) VL 
                 DIVMTQTPLSLSVTPGQPASISCKSSQSLETSTGTT 
               
               
                   
                   
                 YLNWYLQKPGQSPQLLIYRVSKRFSGVPDRFSGSGS 
               
               
                   
                   
                 GTDFTLKISRVEAEDVGVYYCLQLLEDPYTFGQGTK 
               
               
                   
                   
                 LEIK 
               
               
                   
               
               
                 25 
                 dimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254) connected by 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 (G4S) 2  linker 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSEGGGGSGGGGSREGPELSPDDPAGLLDLRQGMF 
               
               
                   
                   
                 AQLVAQNVLLIDGPLSWYSDPGLAGVSLTGGLSYKE 
               
               
                   
                   
                 DTKELVVAKAGVYYVFFQLELRRVVAGEGSGSVSLA 
               
               
                   
                   
                 LHLQPLRSAAGAAALALTVDLPPASSEARNSAFGFQ 
               
               
                   
                   
                 GRLLHLSAGQRLGVHLHTEARARHAWQLTQGATVLG 
               
               
                   
                   
                 LFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 26 
                 dimeric hu 4-1BBL 
                 LDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSL 
               
               
                   
                 (85-254) connected by 
                 TGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGE 
               
               
                   
                 (G4S) 2  linker 
                 GSGSVSLALHLQPLRSAAGAAALALTVDLPPASSEA 
               
               
                   
                   
                 RNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQL 
               
               
                   
                   
                 TQGATVLGLFRVTPEIPAGLPSPRSEGGGGSGGGGS 
               
               
                   
                   
                 LDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSL 
               
               
                   
                   
                 TGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGE 
               
               
                   
                   
                 GSGSVSLALHLQPLRSAAGAAALALTVDLPPASSEA 
               
               
                   
                   
                 RNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQL 
               
               
                   
                   
                 TQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 27 
                 dimeric hu 4-1BBL 
                 DPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGL 
               
               
                   
                 (80-254) connected by 
                 AGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELRR 
               
               
                   
                 (G4S) 2  linker 
                 VVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLPP 
               
               
                   
                   
                 ASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARAR 
               
               
                   
                   
                 HAWQLTQGATVLGLFRVTPEIPAGLPSPRSEGGGGS 
               
               
                   
                   
                 GGGGSDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWY 
               
               
                   
                   
                 SDPGLAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQ 
               
               
                   
                   
                 LELRRVVAGEGSGSVSLALHLQPLRSAAGAAALALT 
               
               
                   
                   
                 VDLPPASSEARNSAFGFQGRLLHLSAGQRLGVHLHT 
               
               
                   
                   
                 EARARHAWQLTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 28 
                 dimeric hu 4-1BBL 
                 PWAVSGARASPGSAASPRLREGPELSPDDPAGLLDL 
               
               
                   
                 (52-254) connected by 
                 RQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTGG 
               
               
                   
                 (G45) 2  linker 
                 LSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEGSG 
               
               
                   
                   
                 SVSLALHLQPLRSAAGAAALALTVDLPPASSEARNS 
               
               
                   
                   
                 AFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLTQG 
               
               
                   
                   
                 ATVLGLFRVTPEIPAGLPSPRSEGGGGSGGGGSPWA 
               
               
                   
                   
                 VSGARASPGSAASPRLREGPELSPDDPAGLLDLRQG 
               
               
                   
                   
                 MFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTGGLSY 
               
               
                   
                   
                 KEDTKELVVAKAGVYYVFFQLELRRVVAGEGSGSVS 
               
               
                   
                   
                 LALHLQPLRSAAGAAALALTVDLPPASSEARNSAFG 
               
               
                   
                   
                 FQGRLLHLSAGQRLGVHLHTEARARHAWQLTQGATV 
               
               
                   
                   
                 LGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 29 
                 dimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-248) connected by 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 (G45)2 linker 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLGG 
               
               
                   
                   
                 GGSGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQ 
               
               
                   
                   
                 NVLLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELV 
               
               
                   
                   
                 VAKAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPL 
               
               
                   
                   
                 RSAAGAAALALTVDLPPASSEARNSAFGFQGRLLHL 
               
               
                   
                   
                 SAGQRLGVHLHTEARARHAWQLTQGATVLGLFRVTP 
               
               
                   
                   
                 EIPAGL 
               
               
                   
               
               
                 30 
                 dimeric hu 4-1BBL 
                 LDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSL 
               
               
                   
                 (85-248) connected by 
                 TGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGE 
               
               
                   
                 (G45)2 linker 
                 GSGSVSLALHLQPLRSAAGAAALALTVDLPPASSEA 
               
               
                   
                   
                 RNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQL 
               
               
                   
                   
                 TQGATVLGLFRVTPEIPAGLGGGGSGGGGSLDLRQG 
               
               
                   
                   
                 MFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTGGLSY 
               
               
                   
                   
                 KEDTKELVVAKAGVYYVFFQLELRRVVAGEGSGSVS 
               
               
                   
                   
                 LALHLQPLRSAAGAAALALTVDLPPASSEARNSAFG 
               
               
                   
                   
                 FQGRLLHLSAGQRLGVHLHTEARARHAWQLTQGATV 
               
               
                   
                   
                 LGLFRVTPEIPAGL 
               
               
                   
               
               
                 31 
                 dimeric hu 4-1BBL 
                 DPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGL 
               
               
                   
                 (80-248) connected by 
                 AGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELRR 
               
               
                   
                 (G45)2 linker 
                 VVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLPP 
               
               
                   
                   
                 ASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARAR 
               
               
                   
                   
                 HAWQLTQGATVLGLFRVTPEIPAGLGGGGSGGGGSD 
               
               
                   
                   
                 PAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLA 
               
               
                   
                   
                 GVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELRRV 
               
               
                   
                   
                 VAGEGSGSVSLALHLQPLRSAAGAAALALTVDLPPA 
               
               
                   
                   
                 SSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARARH 
               
               
                   
                   
                 AWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 32 
                 dimeric hu 4-1BBL 
                 PWAVSGARASPGSAASPRLREGPELSPDDPAGLLDL 
               
               
                   
                 (52-248) connected by 
                 RQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTGG 
               
               
                   
                 (G45)2 linker 
                 LSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEGSG 
               
               
                   
                   
                 SVSLALHLQPLRSAAGAAALALTVDLPPASSEARNS 
               
               
                   
                   
                 AFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLTQG 
               
               
                   
                   
                 ATVLGLFRVTPEIPAGLGGGGSGGGGSPWAVSGARA 
               
               
                   
                   
                 SPGSAASPRLREGPELSPDDPAGLLDLRQGMFAQLV 
               
               
                   
                   
                 AQNVLLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKE 
               
               
                   
                   
                 LVVAKAGVYYVFFQLELRRVVAGEGSGSVSLALHLQ 
               
               
                   
                   
                 PLRSAAGAAALALTVDLPPASSEARNSAFGFQGRLL 
               
               
                   
                   
                 HLSAGQRLGVHLHTEARARHAWQLTQGATVLGLFRV 
               
               
                   
                   
                 TPEIPAGL 
               
               
                   
               
               
                 33 
                 anti-CD19(8B8-018) Fc 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 hole chain 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                   
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSRD 
               
               
                   
                   
                 ELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGK 
               
               
                   
               
               
                 34 
                 anti-CD19(8B8-018) 
                 DIVMTQTPLSLSVTPGQPASISCKSSQSLENPNGNT 
               
               
                   
                 light chain 
                 YLNWYLQKPGQSPQLLIYRVSKRFSGVPDRFSGSGS 
               
               
                   
                   
                 GTDFTLKISRVEAEDVGVYYCLQLTHVPYTFGQGTK 
               
               
                   
                   
                 LEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNF 
               
               
                   
                   
                 YPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSL 
               
               
                   
                   
                 SSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNR 
               
               
                   
                   
                 GEC 
               
               
                   
               
               
                 35 
                 dimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254)-CL* Fc 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 knob chain 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSEGGGGSGGGGSREGPELSPDDPAGLLDLRQGMF 
               
               
                   
                   
                 AQLVAQNVLLIDGPLSWYSDPGLAGVSLTGGLSYKE 
               
               
                   
                   
                 DTKELVVAKAGVYYVFFQLELRRVVAGEGSGSVSLA 
               
               
                   
                   
                 LHLQPLRSAAGAAALALTVDLPPASSEARNSAFGFQ 
               
               
                   
                   
                 GRLLHLSAGQRLGVHLHTEARARHAWQLTQGATVLG 
               
               
                   
                   
                 LFRVTPEIPAGLPSPRSEGGGGSGGGGSRTVAAPSV 
               
               
                   
                   
                 FIFPPSDRKLKSGTASVVCLLNNFYPREAKVQWKVD 
               
               
                   
                   
                 NALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYE 
               
               
                   
                   
                 KHKVYACEVTHQGLSSPVTKSFNRGECDKTHTCPPC 
               
               
                   
                   
                 PAPEAAGGPSVFLFPPKPKDTLMISRTPEVTCVVVD 
               
               
                   
                   
                 VSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYR 
               
               
                   
                   
                 VVSVLTVLHQDWLNGKEYKCKVSNKALGAPIEKTIS 
               
               
                   
                   
                 KAKGQPREPQVYTLPPCRDELTKNQVSLWCLVKGFY 
               
               
                   
                   
                 PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK 
               
               
                   
                   
                 LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP 
               
               
                   
                   
                 GK 
               
               
                   
               
               
                 36 
                 monomeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254)-CH1* 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSEGGGGSGGGGSASTKGPSVFPLAPSSKSTSGGT 
               
               
                   
                   
                 AALGCLVEDYFPEPVTVSWNSGALTSGVHTFPAVLQ 
               
               
                   
                   
                 SSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKV 
               
               
                   
                   
                 DEKVEPKSC 
               
               
                   
               
               
                 37 
                 dimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254)-CL Fc knob 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 chain 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSEGGGGSGGGGSREGPELSPDDPAGLLDLRQGMF 
               
               
                   
                   
                 AQLVAQNVLLIDGPLSWYSDPGLAGVSLTGGLSYKE 
               
               
                   
                   
                 DTKELVVAKAGVYYVFFQLELRRVVAGEGSGSVSLA 
               
               
                   
                   
                 LHLQPLRSAAGAAALALTVDLPPASSEARNSAFGFQ 
               
               
                   
                   
                 GRLLHLSAGQRLGVHLHTEARARHAWQLTQGATVLG 
               
               
                   
                   
                 LFRVTPEIPAGLPSPRSEGGGGSGGGGSRTVAAPSV 
               
               
                   
                   
                 FIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVD 
               
               
                   
                   
                 NALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYE 
               
               
                   
                   
                 KHKVYACEVTHQGLSSPVTKSFNRGECDKTHTCPPC 
               
               
                   
                   
                 PAPEAAGGPSVFLFPPKPKDTLMISRTPEVTCVVVD 
               
               
                   
                   
                 VSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYR 
               
               
                   
                   
                 VVSVLTVLHQDWLNGKEYKCKVSNKALGAPIEKTIS 
               
               
                   
                   
                 KAKGQPREPQVYTLPPCRDELTKNQVSLWCLVKGFY 
               
               
                   
                   
                 PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSK 
               
               
                   
                   
                 LTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP 
               
               
                   
                   
                 GK 
               
               
                   
               
               
                 38 
                 monomeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254)-CH1 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSEGGGGSGGGGSASTKGPSVFPLAPSSKSTSGGT 
               
               
                   
                   
                 AALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQ 
               
               
                   
                   
                 SSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKV 
               
               
                   
                   
                 DKKVEPKSC 
               
               
                   
               
               
                 39 
                 anti-CD19(8B8-018) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc hole dimeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 ligand chain 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSRD 
               
               
                   
                   
                 ELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSEGGGG 
               
               
                   
                   
                 SGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQNV 
               
               
                   
                   
                 LLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELVVA 
               
               
                   
                   
                 KAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPLRS 
               
               
                   
                   
                 AAGAAALALTVDLPPASSEARNSAFGFQGRLLHLSA 
               
               
                   
                   
                 GQRLGVHLHTEARARHAWQLTQGATVLGLFRVTPEI 
               
               
                   
                   
                 PAGLPSPRSE 
               
               
                   
               
               
                 40 
                 anti-CD19(8B8-018) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc knob monomeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 ligand 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRD 
               
               
                   
                   
                 ELTKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 41 
                 dimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-248)-CL* Fc 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 knob chain 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLGG 
               
               
                   
                   
                 GGSGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQ 
               
               
                   
                   
                 NVLLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELV 
               
               
                   
                   
                 VAKAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPL 
               
               
                   
                   
                 RSAAGAAALALTVDLPPASSEARNSAFGFQGRLLHL 
               
               
                   
                   
                 SAGQRLGVHLHTEARARHAWQLTQGATVLGLFRVTP 
               
               
                   
                   
                 EIPAGLGGGGSGGGGSRTVAAPSVFIFPPSDRKLKS 
               
               
                   
                   
                 GTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESV 
               
               
                   
                   
                 TEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQ 
               
               
                   
                   
                 GLSSPVTKSFNRGECDKTHTCPPCPAPEAAGGPSVF 
               
               
                   
                   
                 LFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNW 
               
               
                   
                   
                 YVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDW 
               
               
                   
                   
                 LNGKEYKCKVSNKALGAPIEKTISKAKGQPREPQVY 
               
               
                   
                   
                 TLPPCRDELTKNQVSLWCLVKGFYPSDIAVEWESNG 
               
               
                   
                   
                 QPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGN 
               
               
                   
                   
                 VFSCSVMHEALHNHYTQKSLSLSPGK 
               
               
                   
               
               
                 42 
                 monomeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-248)-CH1* 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLGG 
               
               
                   
                   
                 GGSGGGGSASTKGPSVFPLAPSSKSTSGGTAALGCL 
               
               
                   
                   
                 VEDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYS 
               
               
                   
                   
                 LSSVVTVPSSSLGTQTYICNVNHKPSNTKVDEKVEP 
               
               
                   
                   
                 KSC 
               
               
                   
               
               
                 43 
                 Dimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-248)-CL Fc 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 knob chain 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLGG 
               
               
                   
                   
                 GGSGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQ 
               
               
                   
                   
                 NVLLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELV 
               
               
                   
                   
                 VAKAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPL 
               
               
                   
                   
                 RSAAGAAALALTVDLPPASSEARNSAFGFQGRLLHL 
               
               
                   
                   
                 SAGQRLGVHLHTEARARHAWQLTQGATVLGLFRVTP 
               
               
                   
                   
                 EIPAGLGGGGSGGGGSRTVAAPSVFIFPPSDEQLKS 
               
               
                   
                   
                 GTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESV 
               
               
                   
                   
                 TEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQ 
               
               
                   
                   
                 GLSSPVTKSFNRGECDKTHTCPPCPAPEAAGGPSVF 
               
               
                   
                   
                 LFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNW 
               
               
                   
                   
                 YVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDW 
               
               
                   
                   
                 LNGKEYKCKVSNKALGAPIEKTISKAKGQPREPQVY 
               
               
                   
                   
                 TLPPCRDELTKNQVSLWCLVKGFYPSDIAVEWESNG 
               
               
                   
                   
                 QPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGN 
               
               
                   
                   
                 VFSCSVMHEALHNHYTQKSLSLSPGK 
               
               
                   
               
               
                 44 
                 Monomeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-248)-CH1 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLGG 
               
               
                   
                   
                 GGSGGGGSASTKGPSVFPLAPSSKSTSGGTAALGCL 
               
               
                   
                   
                 VKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYS 
               
               
                   
                   
                 LSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEP 
               
               
                   
                   
                 KSC 
               
               
                   
               
               
                 45 
                 anti-CD19(8B8-018) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc hole dimeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 ligand (71-248) 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                 chain 
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSRD 
               
               
                   
                   
                 ELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLGGGGSGGGGS 
               
               
                   
                   
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                   
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 46 
                 anti-CD19(8B8-018) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc knob monomeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 (71-248) ligand 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRD 
               
               
                   
                   
                 ELTKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 47 
                 anti-CD19(8B8-2B11) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc hole chain 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                   
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSRD 
               
               
                   
                   
                 ELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGK 
               
               
                   
               
               
                 48 
                 CD19 (8B8-2B11) light 
                 DIVMTQTPLSLSVTPGQPASISCKSSQSLETSTGTT 
               
               
                   
                 chain 
                 YLNWYLQKPGQSPQLLIYRVSKRFSGVPDRFSGSGS 
               
               
                   
                   
                 GTDFTLKISRVEAEDVGVYYCLQLLEDPYTFGQGTK 
               
               
                   
                   
                 LEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNF 
               
               
                   
                   
                 YPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSL 
               
               
                   
                   
                 SSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNR 
               
               
                   
                   
                 GEC 
               
               
                   
               
               
                 49 
                 anti-CD19(8B8-2B11) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc hole dimeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 ligand (71-254) 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                 chain 
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSRD 
               
               
                   
                   
                 ELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSEGGGG 
               
               
                   
                   
                 SGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQNV 
               
               
                   
                   
                 LLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELVVA 
               
               
                   
                   
                 KAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPLRS 
               
               
                   
                   
                 AAGAAALALTVDLPPASSEARNSAFGFQGRLLHLSA 
               
               
                   
                   
                 GQRLGVHLHTEARARHAWQLTQGATVLGLFRVTPEI 
               
               
                   
                   
                 PAGLPSPRSE 
               
               
                   
               
               
                 50 
                 anti-CD19(8B8-2B11) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc knob monomeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 (71-254) ligand 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRD 
               
               
                   
                   
                 ELTKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 51 
                 anti-CD19(8B8-2B11) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc hole dimeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 ligand (71-248) 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                 chain 
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSRD 
               
               
                   
                   
                 ELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLGGGGSGGGGS 
               
               
                   
                   
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                   
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                   
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 52 
                 anti-CD 19(8B8-2B11) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc knob monomeric 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 (71-248) ligand 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                   
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRD 
               
               
                   
                   
                 ELTKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
               
               
                 53 
                 trimeric hu 4-1BBL 
                 REGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDGP 
               
               
                   
                 (71-254) Fc knob 
                 LSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVYY 
               
               
                   
                 chain 
                 VFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAAA 
               
               
                   
                   
                 LALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLGV 
               
               
                   
                   
                 HLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLPS 
               
               
                   
                   
                 PRSEGGGGSGGGGSREGPELSPDDPAGLLDLRQGMF 
               
               
                   
                   
                 AQLVAQNVLLIDGPLSWYSDPGLAGVSLTGGLSYKE 
               
               
                   
                   
                 DTKELVVAKAGVYYVFFQLELRRVVAGEGSGSVSLA 
               
               
                   
                   
                 LHLQPLRSAAGAAALALTVDLPPASSEARNSAFGFQ 
               
               
                   
                   
                 GRLLHLSAGQRLGVHLHTEARARHAWQLTQGATVLG 
               
               
                   
                   
                 LFRVTPEIPAGLPSPRSEGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSEGSPG 
               
               
                   
                   
                 SSSSGSDKTHTCPPCPAPEAAGGPSVFLFPPKPKDT 
               
               
                   
                   
                 LMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHN 
               
               
                   
                   
                 AKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCK 
               
               
                   
                   
                 VSNKALGAPIEKTISKAKGQPREPQVYTLPPCRDEL 
               
               
                   
                   
                 TKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYKTT 
               
               
                   
                   
                 PPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHE 
               
               
                   
                   
                 ALHNHYTQKSLSLSPGK 
               
               
                   
               
               
                 54 
                 anti- CD19(8B8-018) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc knob chain fused 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 to trimeric hu 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGSALF 
               
               
                   
                 4-1BBL (71-254) 
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRD 
               
               
                   
                   
                 ELTKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSEGGGG 
               
               
                   
                   
                 SGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQNV 
               
               
                   
                   
                 LLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELVVA 
               
               
                   
                   
                 KAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPLRS 
               
               
                   
                   
                 AAGAAALALTVDLPPASSEARNSAFGFQGRLLHLSA 
               
               
                   
                   
                 GQRLGVHLHTEARARHAWQLTQGATVLGLFRVTPEI 
               
               
                   
                   
                 PAGLPSPRSEGGGGSGGGGSREGPELSPDDPAGLLD 
               
               
                   
                   
                 LRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTG 
               
               
                   
                   
                 GLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEGS 
               
               
                   
                   
                 GSVSLALHLQPLRSAAGAAALALTVDLPPASSEARN 
               
               
                   
                   
                 SAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLTQ 
               
               
                   
                   
                 GATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 55 
                 anti- CD19(8B8-2B11) 
                 QVQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHW 
               
               
                   
                 Fc knob chain fused 
                 VRQAPGQGLEWMGYINPYNDGSKYTEKFQGRVTMTS 
               
               
                   
                 to trimeric hu 
                 DTSISTAYMELSRLRSDDTAVYYCARGTYYYGPQLF 
               
               
                   
                 4-1BBL (71-254) 
                 DYWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTA 
               
               
                   
                   
                 ALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQS 
               
               
                   
                   
                 SGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVD 
               
               
                   
                   
                 KKVEPKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPK 
               
               
                   
                   
                 DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEV 
               
               
                   
                   
                 HNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYK 
               
               
                   
                   
                 CKVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRD 
               
               
                   
                   
                 ELTKNQVSLWCLVKGFYPSDIAVEWESNGQPENNYK 
               
               
                   
                   
                 TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVM 
               
               
                   
                   
                 HEALHNHYTQKSLSLSPGGGGGSGGGGSREGPELSP 
               
               
                   
                   
                 DDPAGLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPG 
               
               
                   
                   
                 LAGVSLTGGLSYKEDTKELVVAKAGVYYVFFQLELR 
               
               
                   
                   
                 RVVAGEGSGSVSLALHLQPLRSAAGAAALALTVDLP 
               
               
                   
                   
                 PASSEARNSAFGFQGRLLHLSAGQRLGVHLHTEARA 
               
               
                   
                   
                 RHAWQLTQGATVLGLFRVTPEIPAGLPSPRSEGGGG 
               
               
                   
                   
                 SGGGGSREGPELSPDDPAGLLDLRQGMFAQLVAQNV 
               
               
                   
                   
                 LLIDGPLSWYSDPGLAGVSLTGGLSYKEDTKELVVA 
               
               
                   
                   
                 KAGVYYVFFQLELRRVVAGEGSGSVSLALHLQPLRS 
               
               
                   
                   
                 AAGAAALALTVDLPPASSEARNSAFGFQGRLLHLSA 
               
               
                   
                   
                 GQRLGVHLHTEARARHAWQLTQGATVLGLFRVTPEI 
               
               
                   
                   
                 PAGLPSPRSEGGGGSGGGGSREGPELSPDDPAGLLD 
               
               
                   
                   
                 LRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLTG 
               
               
                   
                   
                 GLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEGS 
               
               
                   
                   
                 GSVSLALHLQPLRSAAGAAALALTVDLPPASSEARN 
               
               
                   
                   
                 SAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLTQ 
               
               
                   
                   
                 GATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 56 
                 DP47 Fc hole chain 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                   
                 VRQAPGKGLEWVSAISGSGGSTYYADSVKGRFTISR 
               
               
                   
                   
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGSGFDYWGQG 
               
               
                   
                   
                 TLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLV 
               
               
                   
                   
                 KDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSL 
               
               
                   
                   
                 SSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPK 
               
               
                   
                   
                 SCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLMIS 
               
               
                   
                   
                 RTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTK 
               
               
                   
                   
                 PREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNK 
               
               
                   
                   
                 ALGAPIEKTISKAKGQPREPQVCTLPPSRDELTKNQ 
               
               
                   
                   
                 VSLSCAVKGFYPSDIAVEWESNGQPENNYKTTPPVL 
               
               
                   
                   
                 DSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEALHN 
               
               
                   
                   
                 HYTQKSLSLSPGK 
               
               
                   
               
               
                 57 
                 DP47 light chain 
                 EIVLTQSPGTLSLSPGERATLSCRASQSVSSSYLAW 
               
               
                   
                   
                 YQQKPGQAPRLLIYGASSRATGIPDRFSGSGSGTDF 
               
               
                   
                   
                 TLTISRLEPEDFAVYYCQQYGSSPLTFGQGTKVEIK 
               
               
                   
                   
                 RTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPRE 
               
               
                   
                   
                 AKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTL 
               
               
                   
                   
                 TLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC 
               
               
                   
               
               
                 58 
                 DP47 Fc hole chain 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                 fused to dimeric 
                 VRQAPGKGLEWVSAIIGSGASTYYADSVKGRFTISR 
               
               
                   
                 hu 4-1BBL (71-254) 
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGWFGGFNYWG 
               
               
                   
                   
                 QGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGC 
               
               
                   
                   
                 LVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLY 
               
               
                   
                   
                 SLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVE 
               
               
                   
                   
                 PKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLM 
               
               
                   
                   
                 ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK 
               
               
                   
                   
                 TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVS 
               
               
                   
                   
                 NKALGAPIEKTISKAKGQPREPQVCTLPPSRDELTK 
               
               
                   
                   
                 NQVSLSCAVKGFYPSDIAVEWESNGQPENNYKTTPP 
               
               
                   
                   
                 VLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEAL 
               
               
                   
                   
                 HNHYTQKSLSLSPGGGGGSGGGGSREGPELSPDDPA 
               
               
                   
                   
                 GLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGV 
               
               
                   
                   
                 SLTGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVA 
               
               
                   
                   
                 GEGSGSVSLALHLQPLRSAAGAAALALTVDLPPASS 
               
               
                   
                   
                 EARNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAW 
               
               
                   
                   
                 QLTQGATVLGLFRVTPEIPAGLPSPRSEGGGGSGGG 
               
               
                   
                   
                 GSREGPELSPDDPAGLLDLRQGMFAQLVAQNVLLID 
               
               
                   
                   
                 GPLSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGV 
               
               
                   
                   
                 YYVFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGA 
               
               
                   
                   
                 AALALTVDLPPASSEARNSAFGFQGRLLHLSAGQRL 
               
               
                   
                   
                 GVHLHTEARARHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
                   
                 PSPRSE 
               
               
                   
               
               
                 59 
                 DP47 Fc knob chain 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                 fused to monomeric 
                 VRQAPGKGLEWVSAIIGSGASTYYADSVKGRFTISR 
               
               
                   
                 hu 4-1BBL (71-254) 
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGWFGGFNYWG 
               
               
                   
                   
                 QGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGC 
               
               
                   
                   
                 LVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLY 
               
               
                   
                   
                 SLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVE 
               
               
                   
                   
                 PKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLM 
               
               
                   
                   
                 ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK 
               
               
                   
                   
                 TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVS 
               
               
                   
                   
                 NKALGAPIEKTISKAKGQPREPQVYTLPPCRDELTK 
               
               
                   
                   
                 NQVSLWCLVKGFYPSDIAVEWESNGQPENNYKTTPP 
               
               
                   
                   
                 VLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEAL 
               
               
                   
                   
                 HNHYTQKSLSLSPGGGGGSGGGGSREGPELSPDDPA 
               
               
                   
                   
                 GLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGV 
               
               
                   
                   
                 SLTGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVA 
               
               
                   
                   
                 GEGSGSVSLALHLQPLRSAAGAAALALTVDLPPASS 
               
               
                   
                   
                 EARNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAW 
               
               
                   
                   
                 QLTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 60 
                 di-mu4-1BBL-CL Fc 
                 see Table 5 
               
               
                   
                 knob chain 
                   
               
               
                   
               
               
                 61 
                 mono-mu4-1BBL-CH1 
                 see Table 5 
               
               
                   
                 chain 
                   
               
               
                   
               
               
                 62 
                 CD19 
                 UniProt accession No. P15391 
               
               
                   
               
               
                 63 
                 CD20 
                 UniProt accession No. P11836 
               
               
                   
               
               
                 64 
                 murine anti-CD20 
                 GPELVKPGASVKISCKASGYAFSYSWMNWVKLRPGQ 
               
               
                   
                 B-Ly1 VH 
                 GLEWIGRIFPGDGDTDYNGKFKGKATLTADKSSNTA 
               
               
                   
                   
                 YMQLTSLTSVDSAVYLCARNVFDGYWLVYWGQGTLV 
               
               
                   
                   
                 TVSA 
               
               
                   
               
               
                 65 
                 murine anti-CD20 
                 NPVTLGTSASISCRSSKSLLHSNGITYLYWYLQKPG 
               
               
                   
                 B-Ly1 VL 
                 QSPQLLIYQMSNLVSGVPDRFSSSGSGTDFTLRISR 
               
               
                   
                   
                 VEAEDVGVYYCAQNLELPYTFGGGTKLEIKR 
               
               
                   
               
               
                 66 
                 full length 4-1BBL 
                 UniProt No. P41273 
               
               
                   
               
               
                 67 
                 4-1BBL (50-254) 
                 ACPWAVSGARASPGSAASPRLREGPELSPDDPAGLL 
               
               
                   
                   
                 DLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVSLT 
               
               
                   
                   
                 GGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAGEG 
               
               
                   
                   
                 SGSVSLALHLQPLRSAAGAAALALTVDLPPASSEAR 
               
               
                   
                   
                 NSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQLT 
               
               
                   
                   
                 QGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 68 
                 human 
                 4-1BBUniProt accession No. Q07011 
               
               
                   
               
               
                 69 
                 murine 4-1BB 
                 UniProt accession No. P20334 
               
               
                   
               
               
                 70 
                 cynomolgus 4-1BB 
                 UniProt accession No. F6W5G6 
               
               
                   
               
               
                 71 
                 4-1BB (20H4.9) VH 
                 QVQLQQWGAGLLKPSETLSLTCAVYGGSFSGYYWSW 
               
               
                   
                   
                 IRQSPEKGLEWIGEINHGGYVTYNPSLESRVTISVD 
               
               
                   
                   
                 TSKNQFSLKLSSVTAADTAVYYCARDYGPGNYDWYF 
               
               
                   
                   
                 DLWGRGTLVTVSS 
               
               
                   
               
               
                 72 
                 4-1BB (20H4.9) VL 
                 EIVLTQSPATLSLSPGERATLSCRASQSVSSYLAWY 
               
               
                   
                   
                 QQKPGQAPRLLIYDASNRATGIPARFSGSGSGTDFT 
               
               
                   
                   
                 LTISSLEPEDFAVYYCQQRSNWPPALTFGGGTKVEI 
               
               
                   
                   
                 K 
               
               
                   
               
               
                 73 
                 CD20-HCDR1 
                 YSWIN 
               
               
                   
               
               
                 74 
                 CD20-HCDR2 
                 RIFPGDGDTDYNGKFK 
               
               
                   
               
               
                 75 
                 CD20-HCDR3 
                 NVFDGYWLVY 
               
               
                   
               
               
                 76 
                 CD20-LCDR1 
                 RSSKSLLHSNGITYLY 
               
               
                   
               
               
                 77 
                 CD20-LCDR2 
                 QMSNLVS 
               
               
                   
               
               
                 78 
                 CD20-LCDR3 
                 AQNLELPYT 
               
               
                   
               
               
                 79 
                 CD20 VH 
                 QVQLVQSGAEVKKPGSSVKVSCKASGYAFSYSWINW 
               
               
                   
                   
                 VRQAPGQGLEWMGRIFPGDGDTDYNGKFKGRVTITA 
               
               
                   
                   
                 DKSTSTAYMELSSLRSEDTAVYYCARNVFDGYWLVY 
               
               
                   
                   
                 WGQGTLVTVSS 
               
               
                   
               
               
                 80 
                 CD20 VL 
                 DIVMTQTPLSLPVTPGEPASISCRSSKSLLHSNGIT 
               
               
                   
                   
                 YLYWYLQKPGQSPQLLIYQMSNLVSGVPDRFSGSGS 
               
               
                   
                   
                 GTDFTLKISRVEAEDVGVYYCAQNLELPYTFGGGTK 
               
               
                   
                   
                 VEIKRTV 
               
               
                   
               
               
                 81 
                 G4S peptide linker 
                 GGGGS 
               
               
                   
               
               
                 82 
                 (G4S)2 
                 GGGGSGGGGS 
               
               
                   
               
               
                 83 
                 (SG4)2 
                 SGGGGSGGGG 
               
               
                   
               
               
                 84 
                 peptide linker 
                 GGGGSGGGGSGGGG 
               
               
                   
               
               
                 85 
                 peptide linker 
                 GSPGSSSSGS 
               
               
                   
               
               
                 86 
                 (G45) 3  peptide linker 
                 GGGGSGGGGSGGGGS3 
               
               
                   
               
               
                 87 
                 (G45) 4  peptide linker 
                 GGGGSGGGGSGGGGSGGGGS 
               
               
                   
               
               
                 88 
                 peptide linker 
                 GSGSGSGS 
               
               
                   
               
               
                 89 
                 peptide linker 
                 GSGSGNGS 
               
               
                   
               
               
                 90 
                 peptide linker 
                 GGSGSGSG 
               
               
                   
               
               
                 91 
                 peptide linker 
                 GGSGSG 
               
               
                   
               
               
                 92 
                 peptide linker 
                 GGSG 
               
               
                   
               
               
                 93 
                 peptide linker 
                 GGSGNGSG 
               
               
                   
               
               
                 94 
                 peptide linker 
                 GGNGSGSG 
               
               
                   
               
               
                 95 
                 peptide linker 
                 GGNGSG 
               
               
                   
               
               
                 96 
                 FAP (28H1) CDR-H1 
                 SHAMS 
               
               
                   
               
               
                 97 
                 FAP (28H1) CDR-H2 
                 AIWASGEQYYADSVKG 
               
               
                   
               
               
                 98 
                 FAP (28H1) CDR-H3 
                 GWLGNFDY 
               
               
                   
               
               
                 99 
                 FAP (28H1) CDR-L1 
                 RASQSVSRSYLA 
               
               
                   
               
               
                 100 
                 FAP (28H1) CDR-L2 
                 GASTRAT 
               
               
                   
               
               
                 101 
                 FAP (28H1) CDR-L3 
                 QQGQVIPPT 
               
               
                   
               
               
                 102 
                 FAP(4B9) CDR-H1 
                 SYAMS 
               
               
                   
               
               
                 103 
                 FAP(4B9) CDR-H2 
                 AIIGSGASTYYADSVKG 
               
               
                   
               
               
                 104 
                 FAP(4B9) CDR-H3 
                 GWFGGFNY 
               
               
                   
               
               
                 105 
                 FAP(4B9) CDR-L1 
                 RASQSVTSSYLA 
               
               
                   
               
               
                 106 
                 FAP(4B9) CDR-L2 
                 VGSRRAT 
               
               
                   
               
               
                 107 
                 FAP(4B9) CDR-L3 
                 QQGIMLPPT 
               
               
                   
               
               
                 108 
                 FAP(28H1) VH 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSHAMSW 
               
               
                   
                   
                 VRQAPGKGLEWVSAIWASGEQYYADSVKGRFTISRD 
               
               
                   
                   
                 NSKNTLYLQMNSLRAEDTAVYYCAKGWLGNFDYWGQ 
               
               
                   
                   
                 GTLVTVSS 
               
               
                   
               
               
                 109 
                 FAP(28H1) VL 
                 EIVLTQSPGTLSLSPGERATLSCRASQSVSRSYLAW 
               
               
                   
                   
                 YQQKPGQAPRLLIIGASTRATGIPDRFSGSGSGTDF 
               
               
                   
                   
                 TLTISRLEPEDFAVYYCQQGQVIPPTFGQGTKVEIK 
               
               
                   
               
               
                 110 
                 FAP(4B9) VH 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                   
                 VRQAPGKGLEWVSAIIGSGASTYYADSVKGRFTISR 
               
               
                   
                   
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGWFGGFNYWG 
               
               
                   
                   
                 QGTLVTVSS 
               
               
                   
               
               
                 111 
                 FAP(4B9) VL 
                 EIVLTQSPGTLSLSPGERATLSCRASQSVTSSYLAW 
               
               
                   
                   
                 YQQKPGQAPRLLINVGSRRATGIPDRFSGSGSGTDF 
               
               
                   
                   
                 TLTISRLEPEDFAVYYCQQGIMLPPTFGQGTKVEIK 
               
               
                   
               
               
                 112 
                 anti-FAP (4B9) Fc 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                 hole chain 
                 VRQAPGKGLEWVSAIIGSGASTYYADSVKGRFTISR 
               
               
                   
                 (Construct 2.4) 
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGWFGGFNYWG 
               
               
                   
                   
                 QGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGC 
               
               
                   
                   
                 LVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLY 
               
               
                   
                   
                 SLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVE 
               
               
                   
                   
                 PKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLM 
               
               
                   
                   
                 ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK 
               
               
                   
                   
                 TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVS 
               
               
                   
                   
                 NKALGAPIEKTISKAKGQPREPQVCTLPPSRDELTK 
               
               
                   
                   
                 NQVSLSCAVKGFYPSDIAVEWESNGQPENNYKTTPP 
               
               
                   
                   
                 VLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEAL 
               
               
                   
                   
                 HNHYTQKSLSLSPGK 
               
               
                   
               
               
                 113 
                 anti-FAP (4B9) 
                 EIVLTQSPGTLSLSPGERATLSCRASQSVTSSYLAW 
               
               
                   
                 light chain 
                 YQQKPGQAPRLLINVGSRRATGIPDRFSGSGSGTDF 
               
               
                   
                 (Construct 2.4) 
                 TLTISRLEPEDFAVYYCQQGIMLPPTFGQGTKVEIK 
               
               
                   
                   
                 RTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPRE 
               
               
                   
                   
                 AKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTL 
               
               
                   
                   
                 TLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC 
               
               
                   
               
               
                 114 
                 anti-FAP(28H1) 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSHAMSW 
               
               
                   
                 Fc hole chain 
                 VRQAPGKGLEWVSAIWASGEQYYADSVKGRFTISRD 
               
               
                   
                   
                 NSKNTLYLQMNSLRAEDTAVYYCAKGWLGNFDYWGQ 
               
               
                   
                   
                 GTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCL 
               
               
                   
                   
                 VKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYS 
               
               
                   
                   
                 LSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEP 
               
               
                   
                   
                 KSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLMI 
               
               
                   
                   
                 SRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT 
               
               
                   
                   
                 KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSN 
               
               
                   
                   
                 KALGAPIEKTISKAKGQPREPQVCTLPPSRDELTKN 
               
               
                   
                   
                 QVSLSCAVKGFYPSDIAVEWESNGQPENNYKTTPPV 
               
               
                   
                   
                 LDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEALH 
               
               
                   
                   
                 NHYTQKSLSLSPGK 
               
               
                   
               
               
                 115 
                 anti-FAP (28H1) 
                 EIVLTQSPGTLSLSPGERATLSCRASQSVSRSYLAW 
               
               
                   
                 light chain 
                 YQQKPGQAPRLLIIGASTRATGIPDRFSGSGSGTDF 
               
               
                   
                   
                 TLTISRLEPEDFAVYYCQQGQVIPPTFGQGTKVEIK 
               
               
                   
                   
                 RTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPRE 
               
               
                   
                   
                 AKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTL 
               
               
                   
                   
                 TLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC 
               
               
                   
               
               
                 116 
                 anti-FAP (4B9) 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                 Fc hole chain 
                 VRQAPGKGLEWVSAIIGSGASTYYADSVKGRFTISR 
               
               
                   
                 fused to dimeric 
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGWFGGFNYWG 
               
               
                   
                 hu 4-1BBL 
                 QGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGC 
               
               
                   
                 (71-254) 
                 LVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLY 
               
               
                   
                   
                 SLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVE 
               
               
                   
                   
                 PKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLM 
               
               
                   
                   
                 ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK 
               
               
                   
                   
                 TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVS 
               
               
                   
                   
                 NKALGAPIEKTISKAKGQPREPQVCTLPPSRDELTK 
               
               
                   
                   
                 NQVSLSCAVKGFYPSDIAVEWESNGQPENNYKTTPP 
               
               
                   
                   
                 VLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEAL 
               
               
                   
                   
                 HNHYTQKSLSLSPGGGGGSGGGGSREGPELSPDDPA 
               
               
                   
                   
                 GLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGV 
               
               
                   
                   
                 SLTGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVA 
               
               
                   
                   
                 GEGSGSVSLALHLQPLRSAAGAAALALTVDLPPASS 
               
               
                   
                   
                 EARNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAW 
               
               
                   
                   
                 QLTQGATVLGLFRVTPEIPAGLPSPRSEGGGGSGGG 
               
               
                   
                   
                 GSREGPELSPDDPAGLLDLRQGMFAQLVAQNVLLID 
               
               
                   
                   
                 GPLSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGV 
               
               
                   
                   
                 YYVFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGA 
               
               
                   
                   
                 AALALTVDLPPASSEARNSAFGFQGRLLHLSAGQRL 
               
               
                   
                   
                 GVHLHTEARARHAWQLTQGATVLGLFRVTPEIPAGL 
               
               
                   
                   
                 PSPRSE 
               
               
                   
               
               
                 117 
                 anti-FAP (4B9) 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSYAMSW 
               
               
                   
                 Fc knob chain 
                 VRQAPGKGLEWVSAIIGSGASTYYADSVKGRFTISR 
               
               
                   
                 fused to monomeric 
                 DNSKNTLYLQMNSLRAEDTAVYYCAKGWFGGFNYWG 
               
               
                   
                 hu 4-1BBL (71-254) 
                 QGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGC 
               
               
                   
                   
                 LVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLY 
               
               
                   
                   
                 SLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVE 
               
               
                   
                   
                 PKSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLM 
               
               
                   
                   
                 ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK 
               
               
                   
                   
                 TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVS 
               
               
                   
                   
                 NKALGAPIEKTISKAKGQPREPQVYTLPPCRDELTK 
               
               
                   
                   
                 NQVSLWCLVKGFYPSDIAVEWESNGQPENNYKTTPP 
               
               
                   
                   
                 VLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEAL 
               
               
                   
                   
                 HNHYTQKSLSLSPGGGGGSGGGGSREGPELSPDDPA 
               
               
                   
                   
                 GLLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGV 
               
               
                   
                   
                 SLTGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVA 
               
               
                   
                   
                 GEGSGSVSLALHLQPLRSAAGAAALALTVDLPPASS 
               
               
                   
                   
                 EARNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAW 
               
               
                   
                   
                 QLTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 118 
                 anti-FAP (28H1) 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSHAMSW 
               
               
                   
                 Fc hole chain fused 
                 VRQAPGKGLEWVSAIWASGEQYYADSVKGRFTISRD 
               
               
                   
                 to dimeric hu 4-1BBL 
                 NSKNTLYLQMNSLRAEDTAVYYCAKGWLGNFDYWGQ 
               
               
                   
                 (71-254) 
                 GTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCL 
               
               
                   
                   
                 VKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYS 
               
               
                   
                   
                 LSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEP 
               
               
                   
                   
                 KSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLMI 
               
               
                   
                   
                 SRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT 
               
               
                   
                   
                 KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSN 
               
               
                   
                   
                 KALGAPIEKTISKAKGQPREPQVCTLPPSRDELTKN 
               
               
                   
                   
                 QVSLSCAVKGFYPSDIAVEWESNGQPENNYKTTPPV 
               
               
                   
                   
                 LDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEALH 
               
               
                   
                   
                 NHYTQKSLSLSPGGGGGSGGGGSREGPELSPDDPAG 
               
               
                   
                   
                 LLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVS 
               
               
                   
                   
                 LTGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAG 
               
               
                   
                   
                 EGSGSVSLALHLQPLRSAAGAAALALTVDLPPASSE 
               
               
                   
                   
                 ARNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQ 
               
               
                   
                   
                 LTQGATVLGLFRVTPEIPAGLPSPRSEGGGGSGGGG 
               
               
                   
                   
                 SREGPELSPDDPAGLLDLRQGMFAQLVAQNVLLIDG 
               
               
                   
                   
                 PLSWYSDPGLAGVSLTGGLSYKEDTKELVVAKAGVY 
               
               
                   
                   
                 YVFFQLELRRVVAGEGSGSVSLALHLQPLRSAAGAA 
               
               
                   
                   
                 ALALTVDLPPASSEARNSAFGFQGRLLHLSAGQRLG 
               
               
                   
                   
                 VHLHTEARARHAWQLTQGATVLGLFRVTPEIPAGLP 
               
               
                   
                   
                 SPRSE 
               
               
                   
               
               
                 119 
                 anti-FAP (28H1) 
                 EVQLLESGGGLVQPGGSLRLSCAASGFTFSSHAMSW 
               
               
                   
                 Fc knob chain fused 
                 VRQAPGKGLEWVSAIWASGEQYYADSVKGRFTISRD 
               
               
                   
                 to monomeric hu 
                 NSKNTLYLQMNSLRAEDTAVYYCAKGWLGNFDYWGQ 
               
               
                   
                 4-1BBL (71-254) 
                 GTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCL 
               
               
                   
                   
                 VKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYS 
               
               
                   
                   
                 LSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEP 
               
               
                   
                   
                 KSCDKTHTCPPCPAPEAAGGPSVFLFPPKPKDTLMI 
               
               
                   
                   
                 SRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT 
               
               
                   
                   
                 KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSN 
               
               
                   
                   
                 KALGAPIEKTISKAKGQPREPQVYTLPPCRDELTKN 
               
               
                   
                   
                 QVSLWCLVKGFYPSDIAVEWESNGQPENNYKTTPPV 
               
               
                   
                   
                 LDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALH 
               
               
                   
                   
                 NHYTQKSLSLSPGGGGGSGGGGSREGPELSPDDPAG 
               
               
                   
                   
                 LLDLRQGMFAQLVAQNVLLIDGPLSWYSDPGLAGVS 
               
               
                   
                   
                 LTGGLSYKEDTKELVVAKAGVYYVFFQLELRRVVAG 
               
               
                   
                   
                 EGSGSVSLALHLQPLRSAAGAAALALTVDLPPASSE 
               
               
                   
                   
                 ARNSAFGFQGRLLHLSAGQRLGVHLHTEARARHAWQ 
               
               
                   
                   
                 LTQGATVLGLFRVTPEIPAGLPSPRSE 
               
               
                   
               
               
                 120 
                 Human (hu) FAP 
                 UniProt no. Q12884 
               
               
                   
               
               
                 121 
                 hu FAP ectodomain + 
                 RPSRVHNSEENTMRALTLKDILNGTFSYKTFFPNWI 
               
               
                   
                 poly-lys-tag + 
                 SGQEYLHQSADNNIVLYNIETGQSYTILSNRTMKSV 
               
               
                   
                 his 6 -tag 
                 NASNYGLSPDRQFVYLESDYSKLWRYSYTATYYIYD 
               
               
                   
                   
                 LSNGEFVRGNELPRPIQYLCWSPVGSKLAYVYQNNI 
               
               
                   
                   
                 YLKQRPGDPPFQITFNGRENKIFNGIPDWVYEEEML 
               
               
                   
                   
                 ATKYALWWSPNGKFLAYAEFNDTDIPVIAYSYYGDE 
               
               
                   
                   
                 QYPRTINIPYPKAGAKNPVVRIFIIDTTYPAYVGPQ 
               
               
                   
                   
                 EVPVPAMIASSDYYFSWLTWVTDERVCLQWLKRVQN 
               
               
                   
                   
                 VSVLSICDFREDWQTWDCPKTQEHIEESRTGWAGGF 
               
               
                   
                   
                 FVSTPVFSYDAISYYKIFSDKDGYKHIHYIKDTVEN 
               
               
                   
                   
                 AIQITSGKWEAINIFRVTQDSLFYSSNEFEEYPGRR 
               
               
                   
                   
                 NIYRISIGSYPPSKKCVTCHLRKERCQYYTASFSDY 
               
               
                   
                   
                 AKYYALVCYGPGIPISTLHDGRTDQEIKILEENKEL 
               
               
                   
                   
                 ENALKNIQLPKEEIKKLEVDEITLWYKMILPPQFDR 
               
               
                   
                   
                 SKKYPLLIQVYGGPCSQSVRSVFAVNWISYLASKEG 
               
               
                   
                   
                 MVIALVDGRGTAFQGDKLLYAVYRKLGVYEVEDQIT 
               
               
                   
                   
                 AVRKFIEMGFIDEKRIAIWGWSYGGYVSSLALASGT 
               
               
                   
                   
                 GLFKCGIAVAPVSSWEYYASVYTERFMGLPTKDDNL 
               
               
                   
                   
                 EHYKNSTVMARAEYFRNVDYLLIHGTADDNVHFQNS 
               
               
                   
                   
                 AQIAKALVNAQVDFQAMWYSDQNHGLSGLSTNHLYT 
               
               
                   
                   
                 HMTHFLKQCFSLSDGKKKKKKGHHHHHH 
               
               
                   
               
               
                 122 
                 mouse FAP 
                 UniProt no. P97321 
               
               
                   
               
               
                 123 
                 Murine FAP 
                 RPSRVYKPEGNTKRALTLKDILNGTFSYKTYFPNWI 
               
               
                   
                 ectodomain + 
                 SEQEYLHQSEDDNIVFYNIETRESYIILSNSTMKSV 
               
               
                   
                 poly-lys-tag + 
                 NATDYGLSPDRQFVYLESDYSKLWRYSYTATYYIYD 
               
               
                   
                 his 6 -tag 
                 LQNGEFVRGYELPRPIQYLCWSPVGSKLAYVYQNNI 
               
               
                   
                   
                 YLKQRPGDPPFQITYTGRENRIFNGIPDWVYEEEML 
               
               
                   
                   
                 ATKYALWWSPDGKFLAYVEFNDSDIPIIAYSYYGDG 
               
               
                   
                   
                 QYPRTINIPYPKAGAKNPVVRVFIVDTTYPHHVGPM 
               
               
                   
                   
                 EVPVPEMIASSDYYFSWLTWVSSERVCLQWLKRVQN 
               
               
                   
                   
                 VSVLSICDFREDWHAWECPKNQEHVEESRTGWAGGF 
               
               
                   
                   
                 FVSTPAFSQDATSYYKIFSDKDGYKHIHYIKDTVEN 
               
               
                   
                   
                 AIQITSGKWEAIYIFRVTQDSLFYSSNEFEGYPGRR 
               
               
                   
                   
                 NIYRISIGNSPPSKKCVTCHLRKERCQYYTASFSYK 
               
               
                   
                   
                 AKYYALVCYGPGLPISTLHDGRTDQEIQVLEENKEL 
               
               
                   
                   
                 ENSLRNIQLPKVEIKKLKDGGLTFWYKMILPPQFDR 
               
               
                   
                   
                 SKKYPLLIQVYGGPCSQSVKSVFAVNWITYLASKEG 
               
               
                   
                   
                 IVIALVDGRGTAFQGDKFLHAVYRKLGVYEVEDQLT 
               
               
                   
                   
                 AVRKFIEMGFIDEERIAIWGWSYGGYVSSLALASGT 
               
               
                   
                   
                 GLFKCGIAVAPVSSWEYYASIYSERFMGLPTKDDNL 
               
               
                   
                   
                 EHYKNSTVMARAEYFRNVDYLLIHGTADDNVHFQNS 
               
               
                   
                   
                 AQIAKALVNAQVDFQAMWYSDQNHGILSGRSQNHLY 
               
               
                   
                   
                 THMTHFLKQCFSLSDGKKKKKKGHHHHHH 
               
               
                   
               
               
                 124 
                 Cynomolgus FAP 
                 RPPRVHNSEENTMRALTLKDILNGTFSYKTFFPNWI 
               
               
                   
                 ectodomain + 
                 SGQEYLHQSADNNIVLYNIETGQSYTILSNRTMKSV 
               
               
                   
                 poly-lys-tag + 
                 NASNYGLSPDRQFVYLESDYSKLWRYSYTATYYIYD 
               
               
                   
                 his 6 -tag 
                 LSNGEFVRGNELPRPIQYLCWSPVGSKLAYVYQNNI 
               
               
                   
                   
                 YLKQRPGDPPFQITFNGRENKIFNGIPDWVYEEEML 
               
               
                   
                   
                 ATKYALWWSPNGKFLAYAEFNDTDIPVIAYSYYGDE 
               
               
                   
                   
                 QYPRTINIPYPKAGAKNPFVRIFIIDTTYPAYVGPQ 
               
               
                   
                   
                 EVPVPAMIASSDYYFSWLTWVTDERVCLQWLKRVQN 
               
               
                   
                   
                 VSVLSICDFREDWQTWDCPKTQEHIEESRTGWAGGF 
               
               
                   
                   
                 FVSTPVFSYDAISYYKIFSDKDGYKHIHYIKDTVEN 
               
               
                   
                   
                 AIQITSGKWEAINIFRVTQDSLFYSSNEFEDYPGRR 
               
               
                   
                   
                 NIYRISIGSYPPSKKCVTCHLRKERCQYYTASFSDY 
               
               
                   
                   
                 AKYYALVCYGPGIPISTLHDGRTDQEIKILEENKEL 
               
               
                   
                   
                 ENALKNIQLPKEEIKKLEVDEITLWYKMILPPQFDR 
               
               
                   
                   
                 SKKYPLLIQVYGGPCSQSVRSVFAVNWISYLASKEG 
               
               
                   
                   
                 MVIALVDGRGTAFQGDKLLYAVYRKLGVYEVEDQIT 
               
               
                   
                   
                 AVRKFIEMGFIDEKRIAIWGWSYGGYVSSLALASGT 
               
               
                   
                   
                 GLFKCGIAVAPVSSWEYYASVYTERFMGLPTKDDNL 
               
               
                   
                   
                 EHYKNSTVMARAEYFRNVDYLLIHGTADDNVHFQNS 
               
               
                   
                   
                 AQIAKALVNAQVDFQAMWYSDQNHGLSGLSTNHLYT 
               
               
                   
                   
                 HMTHFLKQCFSLSDGKKKKKKGHHHHHH 
               
               
                   
               
            
           
         
       
     
     General information regarding the nucleotide sequences of human immunoglobulins light and heavy chains is given in: Kabat, E.A., et al., Sequences of Proteins of Immunological Interest, 5th ed., Public Health Service, National Institutes of Health, Bethesda, Md. (1991). Amino acids of antibody chains are numbered and referred to according to the numbering systems according to Kabat (Kabat, E.A., et al., Sequences of Proteins of Immunological Interest, 5th ed., Public Health Service, National Institutes of Health, Bethesda, Md. (1991)) as defined above. 
     Aspects of the Invention 
     In the following, some of the aspects of the invention are listed. 
     1. A 4-1BB (CD137) agonist for use in a method for treating or delaying progression of cancer, wherein the 4-1BB agonist is used in combination with an anti-CD20 antibody and wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding binding to a tumor-associated antigen, in particular CD19 or FAP. 
     2. The 4-1BB agonist for use in a method of para 1, wherein the 4-1BB agonist and the anti-CD20 antibody are administered concomitant. 
     3. The 4-1BB agonist for use in a method of paras 1 or 2, wherein the 4-1BB agonist and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. 
     4. The 4-1BB agonist for use in a method of the preceding aspects, wherein the 4-1BB agonist is administered concurrently with, prior to, or subsequently to the 4-1BB agonist. 
     5. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist comprises three ectodomains of 4-1BBL or fragments thereof. 
     6. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is a molecule comprising three ectodomains of 4-1BBL or fragments thereof and wherein the ectodomains of 4-1BBL comprise an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO: 6, SEQ ID NO:7 and SEQ ID NO:8, particularly the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:5. 
     7. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and one antigen binding domain capable of specific binding to CD19. 
     8. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to CD19 will not be internalized by CD19-expressing B cells. 
     9. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one moiety capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises
     (a) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:9, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:10, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:11, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:14, or   (b) a VH domain comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a VL domain comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20.   

     10. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:22 or wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. 
     11. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. 
     12. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. 
     13. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces or eliminates binding to an Fc receptor and/or effector function. 
     14. The 4-1BB agonist for use in a method of any one of of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G 
     15. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     16. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     17. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19 comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:22 or a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:24, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     18. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:39 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:40; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:49 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:50; 
     j) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     k) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; and 
     l) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:51 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:52. 
     19. The 4-1BB agonist for use in a method of any of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     20. The 4-1BB agonist for use in a method of any of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers, and   (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the polypeptide comprising the three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers is fused to the N- or C-terminal amino acid of one of the two subunits of the Fc domain, optionally through a peptide linker.   

     21. The 4-1BB agonist for use in a method of the preceding aspects, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of
     (a) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:53,   (b) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48 and a fusion protein comprising the amino acid sequence of SEQ ID NO:53;   (c) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:54, and   (d) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48, and a fusion protein comprising the amino acid sequence of SEQ ID NO:55.   

     22. The 4-1BB agonist for use in a method of any one of aspects 1 to 3, wherein the 4-1BB agonist is an anti-CD19/anti-4-1BB bispecific antibody. 
     23. The 4-1BB agonist for use in a method of any one of the preceding aspects 1 to 14, wherein the anti-CD20 antibody is a Type I anti-CD20 antibody. 
     24. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the anti-CD20 antibody is rituximab. 
     25. The 4-1BB agonist for use in a method of the preceding aspects, wherein the anti-CD20 antibody is a Type II anti-CD20 antibody. 
     26. The 4-1BB agonist for use in in a method of the preceding aspects, wherein the anti-CD20 antibody is an afucosylated anti-CD20 antibody. 
     27. The 4-1BB agonist for use in in a method of any one of claim  1  to  14  or  17  or  18 , wherein the anti-CD20 antibody is obinutuzumab. 
     28. The 4-1BB agonist for use in in a method of any one of claims  1  to  14 , wherein the the anti-CD20 antibody is rituximab or obinutuzumab. 
     29. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the anti-CD20 antibody comprises a heavy chain variable region (V H CD20) comprising CDR-H1 sequence of SEQ ID NO:73, CDR-H2 sequence of SEQ ID NO:74, and CDR-H3 sequence of SEQ ID NO:75, and/or a light chain variable region (V L CD20) comprising CDR-L1 sequence of SEQ ID NO:76, CDR-L2 sequence of SEQ ID NO:77, and CDR-L3 sequence of SEQ ID NO:78. 
     30. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the second antigen binding domain comprises a heavy chain variable region (V H CD20) comprising the amino acid sequence of SEQ ID NO:79 and/or a light chain variable region (V L CD20) comprising the amino acid sequence of SEQ ID NO:80. 
     31. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist comprises an Fc domain comprising one or more amino acid substitutions that reduce binding to an Fc receptor and/or effector function. 
     32. The 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist comprises an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     33. A 4-1BB agonist for use in a method of any one of the preceding aspects, wherein the 4-1BB agonist is used in combination with an anti-CD20 antibody and wherein the combination is administered at intervals from about about one week to three weeks. 
     34. A pharmaceutical product comprising (A) a first composition comprising as active ingredient an 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and a pharmaceutically acceptable excipient; and (B) a second composition comprising as active ingredient an anti-CD20 antibody and a pharmaceutically acceptable excipient, for use in the combined, sequential or simultaneous, treatment of a disease, in particular cancer. 
     35. The pharmaceutical product of aspect 34 for use in the treatment of B-cell proliferative disorders, in particular a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     36. A pharmaceutical composition comprising 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and an anti-CD20 antibody. 
     37. The pharmaceutical composition of aspect 36, wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. 
     38. The pharmaceutical composition of aspect 36 or 37, wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and is administered concurrently with, prior to, or subsequently to the anti-CD20 antibody. 
     39. The pharmaceutical composition of any one of aspects 36 to 38, wherein the 4-1BB agonist comprises three ectodomains of 4-1BBL or fragments thereof. 
     40. The pharmaceutical composition of any one of aspects 36 to 39, wherein the 4-1BB agonist is a molecule comprising three ectodomains of 4-1BBL or fragments thereof and wherein the ectodomains of 4-1BBL comprise an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO: 6, SEQ ID NO:7 and SEQ ID NO:8, particularly the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:5. 
     41. The pharmaceutical composition of any one of aspects 36 to 40, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19. 
     42. The pharmaceutical composition of any one of aspects 36 to 41, wherein the 4-1BB agonist will not be internalized in B cells. 
     43. The pharmaceutical composition of any one of aspects 36 to 42, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one moiety capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises
     (a) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:9, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:10, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:11, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:14, or   (b) a VH domain comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a VL domain comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20.   

     44. The pharmaceutical composition of any one of aspects 36 to 43, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:22 or wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. 
     45. The pharmaceutical composition of any one of aspects 36 to 44, wherein the 4-1BB agonist is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. 
     46. The pharmaceutical composition of any one of aspects 36 to 44, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. 
     47. The pharmaceutical composition of any one of aspects 36 to 46, wherein the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces binding to an Fc receptor and/or effector function. 
     48. The pharmaceutical composition of any one of aspects 36 to 47, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     49. The pharmaceutical composition of any one of aspects 36 to 48, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     50. The pharmaceutical composition of any one of aspects 36 to 49, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     51. The pharmaceutical composition of any one of aspects 36 to 50, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19 comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:22 or a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:24, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     52. The pharmaceutical composition of any one of aspects 36 to 51, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:39 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:40; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:49 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:50; 
     j) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     k) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; and 
     l) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:51 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:52. 
     53. The pharmaceutical composition of any one of aspects 36 to 48, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     54. The pharmaceutical composition of any one of aspects 36 to 48 or 53, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers, and   (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the polypeptide comprising the three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers is fused to the N- or C-terminal amino acid of one of the two subunits of the Fc domain, optionally through a peptide linker.   

     55. The pharmaceutical composition of any one of aspects 36 to 48 or 53 or 54, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of
     (a) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:53,   (b) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48 and a fusion protein comprising the amino acid sequence of SEQ ID NO:53;   (c) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:54, and   (d) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48, and a fusion protein comprising the amino acid sequence of SEQ ID NO:55.   

     56. The pharmaceutical composition of any one of aspects 36 to 38, wherein the 4-1BB agonist is an anti-CD19/anti-4-1BB bispecific antibody. 
     57. The pharmaceutical composition of any one of aspects 36 to 56, wherein the anti-CD20 antibody comprises a heavy chain variable region (V H CD20) comprising CDR-H1 sequence of SEQ ID NO:73, CDR-H2 sequence of SEQ ID NO:74, and CDR-H3 sequence of SEQ ID NO:75, and/or a light chain variable region (V L CD20) comprising CDR-L1 sequence of SEQ ID NO:76, CDR-L2 sequence of SEQ ID NO:77 and CDR-L3 sequence of SEQ ID NO:78. 
     58. The pharmaceutical composition of any one of aspects 36 to 57, wherein the anti-CD20 antibody comprises a heavy chain variable region (V H CD20) comprising the amino acid sequence of SEQ ID NO:79 and/or a light chain variable region (V L CD20) comprising the amino acid sequence of SEQ ID NO:80. 
     59. The pharmaceutical composition of any one of aspects 36 to 58, wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19 is used in combination with an anti-CD20 antibody and wherein the combination is administered at intervals from about about one week to three weeks. 
     60. The pharmaceutical composition of any one of aspects 36 to 59 for use in treating or delaying progression of a proliferative disease, in particular cancer. 
     61. The pharmaceutical composition of any one of aspects 36 to 60 for use in the treatment of B-cell proliferative disorders, in particular a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     62. A kit for treating or delaying progression of cancer in a subject, comprising a package comprising (A) a first composition comprising as active ingredient 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19 and a pharmaceutically acceptable excipient; (B) a second composition comprising as active ingredient an anti-CD20 antibody and a pharmaceutically acceptable excipient, and (C) instructions for using the compositions in a combination therapy. 
     63. Use of a combination of a 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19 and an anti-CD20 antibody in the manufacture of a medicament for treating or delaying progression of a proliferative disease, in particular cancer. 
     64. Use of a combination of a 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19 and an anti-CD20 antibody in the manufacture of a medicament, wherein the medicament is for the treatment of B-cell proliferative disorders, in particular a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     65. A method for treating or delaying progression of cancer in a subject comprising administering to the subject an effective amount of a 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and an anti-CD20 antibody. 
     66. A method for treating or delaying progression of cancer in a subject comprising administering to the subject an effective amount of a 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19 and an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule. 
     67. The method of aspects 65 or 66, wherein the 4-1BB agonist is an antigen binding molecule comprising a Fc domain. 
     68. The method of any one of aspects 65 to 67, wherein the 4-1BB agonist is an antigen binding molecule comprising a Fc domain with modifications reducing Fcγ receptor binding and/or effector function. 
     69. The method of any one of aspects 65 to 68, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof. 
     70. The method of any one of aspects 65 to 69, wherein the -1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and an antigen binding domain capable of specific binding to CD19. 
     71. The method of any one of aspects 65 to 70, wherein the 4-1BB agonist is a molecule comprising three ectodomains of 4-1BBL or fragments thereof and wherein the ectodomains of 4-1BBL comprise an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO: 6, SEQ ID NO:7 and SEQ ID NO:8, particularly the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:5. 
     72. The method of any one of aspects 65 to 71, wherein the 4-1BB agonist will not be internalized in B cells. 
     73. The method of any one of aspects 65 to 72, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one moiety capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises
     (a) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:9, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:10, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:11, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:14, or   (b) a VH domain comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a VL domain comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20.   

     74. The method of any one of aspects 65 to 73, wherein the 4-1BB agonist is an antigen binding molecule comprising three ectodomains of 4-1BBL or fragments thereof and at least one antigen binding domain capable of specific binding to CD19, wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:22 or wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. 
     75. The method of any one of aspects 65 to 74, wherein the 4-1BB agonist is an antigen binding molecule further comprising a Fc domain composed of a first and a second subunit capable of stable association. 
     76. The method of any one of aspects 65 to 75, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. 
     77. The method of any one of aspects 65 to 76, wherein the 4-1BB agonist is an antigen binding molecule comprising a Fc domain that comprises one or more amino acid substitution that reduces binding to an Fc receptor and/or effector function. 
     78. The method of any one of aspects 65 to 77, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG1 Fc domain comprising the amino acid substitutions L234A, L235A and P329G. 
     79. The method of any one of aspects 65 to 78, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and in that the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     80. The method of any one of aspects 65 to 79, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that
       (i) the first polypeptide contains a CH1 or CL domain and the second polypeptide contains a CL or CH1 domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the CH1 or CL domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the CL or CH1 domain of said polypeptide, or   (ii) the first polypeptide contains a CH3 domain and the second polypeptide contains a CH3 domain, respectively, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to the C-terminus of the CH3 domain by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to the C-terminus of the CH3 domain of said polypeptide, or   (iii) the first polypeptide contains a VH-CL or a VL-CH1 domain and the second polypeptide contains a VL-CH1 domain or a VH-CL domain, respectively, wherein the second polypeptide is linked to the first polypeptide by a disulfide bond between the CH1 and CL domain, and wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other and to VH or VL by a peptide linker and wherein the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof connected via a peptide linker to VL or VH of said polypeptide.   
       

     81. The method of any one of aspects 65 to 80, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19 comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:22 or a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:24, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     82. The method of any one of aspects 65 to 81, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:39 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:40; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:49 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:50; 
     j) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     k) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; and 
     l) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:51 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:52. 
     83. The method of any one of aspects 65 to 82, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers.   

     84. The method of any one of aspects 65 to 83, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a polypeptide comprising three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers, and   (c) a Fc domain composed of a first and a second subunit capable of stable association, wherein the polypeptide comprising the three ectodomains of 4-1BBL or fragments thereof that are connected to each other by peptide linkers is fused to the N- or C-terminal amino acid of one of the two subunits of the Fc domain, optionally through a peptide linker.   

     85. The method of any one of aspects 65 to 84, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of
     (a) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:53,   (b) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48 and a fusion protein comprising the amino acid sequence of SEQ ID NO:53;   (c) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:33, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:34, and a fusion protein comprising the amino acid sequence of SEQ ID NO:54, and   (d) a molecule comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:47, a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:48, and a fusion protein comprising the amino acid sequence of SEQ ID NO:55.   

     86. The method of any one of aspects 65 to 68, wherein the 4-1BB agonist is an anti-CD19/anti-4-1BB bispecific antibody. 
     87. The method of any one of aspects 65 to 86, wherein the anti-CD20 antibody comprises a heavy chain variable region (V H CD20) comprising CDR-H1 sequence of SEQ ID NO:73, CDR-H2 sequence of SEQ ID NO:74, and CDR-H3 sequence of SEQ ID NO:75, and/or a light chain variable region (V L CD20) comprising CDR-L1 sequence of SEQ ID NO:76, CDR-L2 sequence of SEQ ID NO:77, and CDR-L3 sequence of SEQ ID NO:78. 
     88. The method of any one of aspects 65 to 87, wherein the anti-CD20 antibody comprises a heavy chain variable region (V H CD20) comprising the amino acid sequence of SEQ ID NO:79 and/or a light chain variable region (V L CD20) comprising the amino acid sequence of SEQ ID NO:80. 
     89. The method of any one of aspects 65 to 86, wherein the anti-CD20 antibody comprises rituximab. 
     90. The method of any one of aspects 65 to 89, wherein 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 is used in combination with an anti-CD20 antibody and wherein the combination is administered at intervals from about about one week to three weeks. 
     91. The method of any one of aspects 65 to 90, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen, in particular CD19 or FAP, and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. 
     92. The method of any one of aspects 65 to 91, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 and the anti-CD20 antibody are administered intravenously or subcutaneously. 
     93. The method of any one of aspects 65 to 92, wherein the 4-1BB agonist comprising at least one antigen binding domain capable of specific binding to CD19 is administered concurrently with, prior to, or subsequently to the anti-CD20 antibody. 
     94. A combination comprising a 4-1BB (CD137) agonist and an anti-CD20 antibody, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to a tumor-associated antigen. 
     95. The combination of aspect 94, wherein the 4-1BB agonist and the anti-CD20 antibody are administered concomitant. 
     96. The combination of aspects 94 or 95, wherein the 4-1BB agonist and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. 
     97. The combination of any one of aspects 94 to 96, wherein the 4-1BB agonist comprises at least one antigen binding domain capable of specific binding to CD19. 
     98. The combination of any one of aspects 94 to 97, wherein the 4-1BB agonist comprises three ectodomains of 4-1BBL or fragments thereof. 
     99. The combination of any one of aspects 94 to 98, wherein the 4-1BB agonist comprises three ectodomains of 4-1BBL or fragments thereof and wherein the ectodomains of 4-1BBL comprise an amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO: 2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO: 6, SEQ ID NO:7 and SEQ ID NO:8, particularly the amino acid sequence of SEQ ID NO:1 or SEQ ID NO:5. 
     100. The combination of any one of aspects 94 to 99, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to CD19 and three ectodomains of 4-1BBL or fragments thereof, wherein the antigen binding domain capable of specific binding to CD19 comprises
     (a) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:9, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:10, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:11, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:14, or   (b) a heavy chain variable region (V H CD19) comprising (i) CDR-H1 comprising the amino acid sequence of SEQ ID NO:15, (ii) CDR-H2 comprising the amino acid sequence of SEQ ID NO:16, and (iii) CDR-H3 comprising the amino acid sequence of SEQ ID NO:17, and a light chain variable region (V L CD19) comprising (iv) CDR-L1 comprising the amino acid sequence of SEQ ID NO:18, (v) CDR-L2 comprising the amino acid sequence of SEQ ID NO:19, and (vi) CDR-L3 comprising the amino acid sequence of SEQ ID NO:20.   

     101. The combination of any one of aspects 94 to 100, wherein the 4-1BB agonist is an antigen binding molecule comprising at least one antigen binding domain capable of specific binding to CD19 and three ectodomains of 4-1BBL or fragments thereof, wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:22 or wherein the antigen binding domain capable of specific binding to CD19 comprises a heavy chain variable region (V H CD19) comprising an amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising an amino acid sequence of SEQ ID NO:24. 
     102. The combination of any one of aspects 94 to 101, wherein the 4-1BB agonist is an antigen binding molecule comprising an IgG Fc domain, specifically an IgG1 Fc domain or an IgG4 Fc domain. 
     103. The combination of any one of aspects 94 to 102, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one antigen binding domain capable of specific binding to CD19,   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the first polypeptide comprises two ectodomains of 4-1BBL or fragments thereof that are connected to each other by a peptide linker and the second polypeptide comprises one ectodomain of 4-1BBL or a fragment thereof.   

     104. The combination of any one of aspects 94 to 103, wherein the 4-1BB agonist is an antigen binding molecule comprising
     (a) at least one Fab domain capable of specific binding to CD19 comprising a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:21 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:22 or a heavy chain variable region (V H CD19) comprising the amino acid sequence of SEQ ID NO:23 and a light chain variable region (V L CD19) comprising the amino acid sequence of SEQ ID NO:24, and   (b) a first and a second polypeptide that are linked to each other by a disulfide bond, wherein the antigen binding molecule is characterized in that the first polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:25, SEQ ID NO:26, SEQ ID NO:27, SEQ ID NO:28, SEQ ID NO:29, SEQ ID NO:30, SEQ ID NO:31 and SEQ ID NO:32 and in that the second polypeptide comprises the amino acid sequence selected from the group consisting of SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7 and SEQ ID NO:8.   

     105. The combination of any one of aspects 94 to 104, wherein the 4-1BB agonist is an antigen binding molecule selected from the group consisting of 
     a) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     b) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     c) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:39 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:40; 
     d) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     e) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:33, a first light chain comprising the amino acid sequence of SEQ ID NO:34, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; 
     f) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:34, a first heavy chain comprising the amino acid sequence of SEQ ID NO:45 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:46; 
     g) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:35 and a second light chain comprising the amino acid sequence of SEQ ID NO:36; 
     h) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:37 and a second light chain comprising the amino acid sequence of SEQ ID NO:38; 
     i) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:49 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:50; 
     j) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:41 and a second light chain comprising the amino acid sequence of SEQ ID NO:42; 
     k) a molecule comprising a first heavy chain comprising the amino acid sequence of SEQ ID NO:47, a first light chain comprising the amino acid sequence of SEQ ID NO:48, a second heavy chain comprising the amino acid sequence of SEQ ID NO:43 and a second light chain comprising the amino acid sequence of SEQ ID NO:44; and 
     l) a molecule comprising two light chains comprising the amino acid sequence of SEQ ID NO:48, a first heavy chain comprising the amino acid sequence of SEQ ID NO:51 and a second heavy chain comprising the amino acid sequence of SEQ ID NO:52. 
     106. The combination of any one of aspects 94 to 105, wherein the 4-1BB agonist is an antigen binding molecule comprising one antigen binding domain capable of specific binding to CD19. 
     107. The combination of any one of aspects 94 to 97, wherein the 4-1BB agonist is an anti-CD19/anti-4-1BB bispecific antibody. 
     108. The combination of any one of aspects 94 to 107, wherein the anti-CD20 antibody is a Type I anti-CD20 antibody. 
     109. The combination of any one of aspects 94 to 108, wherein the anti-CD20 antibody is rituximab. 
     110. The combination of any one of aspects 94 to 107, wherein the anti-CD20 antibody is a Type II anti-CD20 antibody. 
     111. The combination of any one of aspects 94 to 107 or 110, wherein the anti-CD20 antibody is an afucosylated anti-CD20 antibody. 
     112. The combination of any one of aspects 94 to 107 or 111 or 112, wherein the anti-CD20 antibody is obinutuzumab. 
     113. The combination of any one of aspects 94 to 107, wherein the anti-CD20 antibody is rituximab or obinutuzumab. 
     114. The combination of any one of aspects 94 to 113 for use as medicament. 
     115. The combination of any one of aspects 94 to 114, wherein the 4-1BB agonist and the anti-CD20 antibody are administered together in a single composition or administered separately in two or more different compositions. 
     116. The combination of any one of aspects 94 to 115, wherein the 4-1BB agonist and the anti-CD20 antibody are for simultaneous administration or for sequential administration. 
     117. The combination of any one of aspects 94 to 116 for use for use in the treatment of B-cell proliferative disorders, in particular a disease selected from the group consisting of Non-Hodgkin lymphoma (NHL), acute lymphocytic leukemia (ALL), chronic lymphocytic leukemia (CLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), mantle-cell lymphoma (MCL), marginal zone lymphoma (MZL), Multiple myeloma (MM) and Hodgkin lymphoma (HL). 
     EXAMPLES 
     The following are examples of methods and compositions of the invention. It is understood that various other embodiments may be practiced, given the general description provided above. 
     Recombinant DNA Techniques 
     Standard methods were used to manipulate DNA as described in Sambrook et al., Molecular cloning: A laboratory manual; Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York, 1989. The molecular biological reagents were used according to the manufacturer&#39;s instructions. General information regarding the nucleotide sequences of human immunoglobulin light and heavy chains is given in: Kabat, E.A. et al., (1991) Sequences of Proteins of Immunological Interest, Fifth Ed., NIH Publication No 91-3242. 
     DNA Sequencing 
     DNA sequences were determined by double strand sequencing. 
     Gene Synthesis 
     Desired gene segments were either generated by PCR using appropriate templates or were synthesized by Geneart AG (Regensburg, Germany) from synthetic oligonucleotides and PCR products by automated gene synthesis. In cases where no exact gene sequence was available, oligonucleotide primers were designed based on sequences from closest homologues and the genes were isolated by RT-PCR from RNA originating from the appropriate tissue. The gene segments flanked by singular restriction endonuclease cleavage sites were cloned into standard cloning/sequencing vectors. The plasmid DNA was purified from transformed bacteria and concentration determined by UV spectroscopy. The DNA sequence of the subcloned gene fragments was confirmed by DNA sequencing. Gene segments were designed with suitable restriction sites to allow sub-cloning into the respective expression vectors. All constructs were designed with a 5′-end DNA sequence coding for a leader peptide which targets proteins for secretion in eukaryotic cells. 
     Cell Culture Techniques 
     Standard cell culture techniques were used as described in Current Protocols in Cell Biology (2000), Bonifacino, J. S., Dasso, M., Harford, J. B., Lippincott-Schwartz, J. and Yamada, K. M. (eds.), John Wiley &amp; Sons, Inc. 
     Protein Purification 
     Proteins were purified from filtered cell culture supernatants referring to standard protocols. In brief, antibodies were applied to a Protein A Sepharose column (GE healthcare) and washed with PBS. Elution of antibodies was achieved at pH 2.8 followed by immediate neutralization of the sample. Aggregated protein was separated from monomeric antibodies by size exclusion chromatography (Superdex 200, GE Healthcare) in PBS or in 20 mM Histidine, 150 mM NaCl pH 6.0. Monomeric antibody fractions were pooled, concentrated (if required) using e.g., a MILLIPORE Amicon Ultra (30 MWCO) centrifugal concentrator, frozen and stored at −20° C. or −80° C. Part of the samples were provided for subsequent protein analytics and analytical characterization e.g. by SDS-PAGE, size exclusion chromatography (SEC) or mass spectrometry. 
     SDS-PAGE 
     The NuPAGE® Pre-Cast gel system (Invitrogen) was used according to the manufacturer&#39;s instruction. In particular, 10% or 4-12% NuPAGE® Novex® Bis-TRIS Pre-Cast gels (pH 6.4) and a NuPAGE® MES (reduced gels, with NuPAGE® Antioxidant running buffer additive) or MOPS (non-reduced gels) running buffer was used. 
     Analytical Size Exclusion Chromatography 
     Size exclusion chromatography (SEC) for the determination of the aggregation and oligomeric state of antibodies was performed by HPLC chromatography. Briefly, Protein A purified antibodies were applied to a Tosoh TSKgel G3000SW column in 300 mM NaCl, 50 mM KH 2 PO 4 /K 2 HPO 4 , pH 7.5 on an Agilent HPLC 1100 system or to a Superdex 200 column (GE Healthcare) in 2× PBS on a Dionex HPLC-System. The eluted protein was quantified by UV absorbance and integration of peak areas. BioRad Gel Filtration Standard 151-1901 served as a standard. 
     Determination of Binding and Binding Affinity of Multispecific Antibodies to the Respective Antigens Using Surface Plasmon Resonance (SPR) (BIACORE) 
     Binding of the generated antibodies to the respective antigens is investigated by surface plasmon resonance using a BIACORE instrument (GE Healthcare Biosciences AB, Uppsala, Sweden). Briefly, for affinity measurements Goat-Anti-Human IgG, JIR 109-005-098 antibodies are immobilized on a CMS chip via amine coupling for presentation of the antibodies against the respective antigen. Binding is measured in HBS buffer (HBS-P (10 mM HEPES, 150 mM NaCl, 0.005% Tween 20, ph 7.4), 25° C. (or alternatively at 37° C.). Antigen (R&amp;D Systems or in house purified) was added in various concentrations in solution. Association was measured by an antigen injection of 80 seconds to 3 minutes; dissociation was measured by washing the chip surface with HBS buffer for 3-10 minutes and a KD value was estimated using a 1:1 Langmuir binding model. Negative control data (e.g. buffer curves) are subtracted from sample curves for correction of system intrinsic baseline drift and for noise signal reduction. The respective Biacore Evaluation Software is used for analysis of sensorgrams and for calculation of affinity data. 
     Example 1 
     Preparation, Purification and Characterization of 4-1BBL Antigen Binding Molecules Comprising at Least One Antigen Binding Domain Capable of Specific Binding to a Tumor-Associated Antigen 
     CD19-targeted 4-1BB ligand trimer-containing Fc fusion antigen binding molecules were prepared as described in International Patent Appl. Publ. No. WO 2016/075278 A1. 
     In particular, the following molecules were made: 
     a) Monovalent CD19-Targeted and Untargeted 4-1BB Ligand Trimer-Containing Fc Fusion Antigen Binding Molecules 
     A DNA sequence encoding a dimeric 4-1BB ligand fused to human CL domain was subcloned in frame with the human IgG1 heavy chain CH2 and CH3 domains on the knob (Merchant, Zhu et al. 1998). A polypeptide containing one ectodomain of the 4-1BB ligand was fused to the human IgG1-CH1 domain. In Construct 3.4, in order to improve correct pairing the following mutations were additionally introduced in the crossed CH-CL (charged variant). In the dimeric 4-1BB ligand fused to human CL, E123R and Q124K, in the monomeric 4-1BB ligand fused to human CH1, K147E and K213E. 
     The variable region of heavy and light chain DNA sequences encoding a binder specific for CD19, clone 8B8-018 or clone 8B8-2B11, were subcloned in frame with either the constant heavy chain of the hole or the constant light chain of human IgG1. The Pro329Gly, Leu234Ala and Leu235Ala mutations have been introduced in the constant region of the knob and hole heavy chains to abrogate binding to Fc gamma receptors according to the method described in WO 2012/130831.Combination of the dimeric ligand-Fc knob chain containing the S354C/T366W mutations, the monomeric CH1 fusion, the targeted anti-CD19-Fc hole chain containing the Y349C/T366S/L368A/Y407V mutations and the anti-CD19 light chain allows generation of a heterodimer, which includes an assembled trimeric 4-1BB ligand and a CD19 binding Fab ( FIG. 1A  and  FIG. 1B ). An untargeted version has been prepared accordingly by replacing the CD19 binder by germline DP47 ( FIG. 1C ). 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Monovalent CD19-4-1BBL Constructs used in the experiments 
               
            
           
           
               
               
               
            
               
                   
                 Example in WO 
                   
               
               
                   
                 2016/075278 
                 composed of 
               
               
                   
                   
               
            
           
           
               
               
               
            
               
                 mono CD19(018)- 
                 Example 7.1.6 
                 SEQ ID NO: 33, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 3.4) 
                 NO: 34 SEQ ID NO: 41 and 
               
               
                 (Charged variant) 
                   
                 SEQ ID NO: 42 
               
               
                 mono CD19(2B11)- 
                 Example 7.2.6 
                 SEQ ID NO: 47, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 4.4) 
                 NO: 48 SEQ ID NO: 41 and 
               
               
                 (Charged variant) 
                   
                 SEQ ID NO: 42 
               
               
                 mono CD19(2B11)- 
                 Example 7.2.7 
                 SEQ ID NO: 47, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 4.5) 
                 NO: 48 SEQ ID NO: 43 and 
               
               
                   
                   
                 SEQ ID NO: 44 
               
               
                 mono untargeted 
                 Example 7.3.12 
                 SEQ ID NO: 56, SEQ ID 
               
               
                 DP47-4-1BBL 
                 (Control D) 
                 NO: 57 SEQ ID NO: 43 and 
               
               
                   
                   
                 SEQ ID NO: 44 
               
               
                   
               
            
           
         
       
     
     b) Bivalent CD19-Targeted and Untargeted 4-1BB Ligand Trimer-Containing Fc Fusion Antigen Binding Molecules 
     The DNA sequences encoding the heavy and light chain variable regions of heavy and light chain specific a binder specific for CD19, clone 8B8-018 or clone 8B8-2B11, were subcloned in frame with either the constant heavy chain of the hole, the knob or the constant light chain of human IgG1. The Pro329Gly, Leu234Ala and Leu235Ala mutations were introduced in the constant region of the knob and hole heavy chains to abrogate binding to Fc gamma receptors according to the method described in WO 2012/130831. Furthermore, a polypeptide comprising two ectodomains of 4-1BB ligand was fused to the C-terminus of human IgG1 Fc hole chain and a polypeptide comprising one ectodomain of 4-1BB ligand was fused to the C-terminus of human IgG1 Fc knob chain. Combination of the anti-CD19 huIgG1 hole dimeric ligand heavy chain containing the Y349C/T366S/L368A/Y407V mutations, the anti-CD19 huIgG1 knob monomeric ligand heavy chain containing the S354C/T366W mutations and the anti-CD19 light chains allowed generation of a heterodimer, which included an assembled trimeric 4-1BB ligand and two CD19 binding Fabs ( FIG. 1D ). An untargeted version has been prepared accordingly by replacing the CD19 binder by germline DP47 ( FIG. 1E ). 
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Bivalent CD19-4-1BBL Constructs used in the experiments 
               
            
           
           
               
               
               
            
               
                   
                 Example in WO 
                   
               
               
                   
                 2016/075278 
                 composed of 
               
               
                   
                   
               
            
           
           
               
               
               
            
               
                 bi CD19(018)- 
                 Example 7.1.8 
                 2 x SEQ ID NO: 34, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 3.6) 
                 NO: 45 and SEQ ID NO: 46 
               
               
                 bi CD19(2B11)- 
                 Example 7.2.8 
                 2 x SEQ ID NO: 48 SEQ ID 
               
               
                 4-1BBL 
                 (Construct 4.6) 
                 NO: 51 and SEQ ID NO: 52 
               
               
                 bi untargeted 
                 Example 7.3.12 
                 2 x SEQ ID NO: 57 SEQ ID 
               
               
                 DP47-4-1BBL 
                 (Control C) 
                 NO: 58 and SEQ ID NO: 59 
               
               
                   
               
            
           
         
       
     
     The production and characterization of the CD19-targeted and untargeted 4-1BB ligand trimer-containing Fc fusion antigen binding molecules is described in detail in WO 2016/075278, Example 7.4 and Examples 8 to 11, respectively. 
     FAP-targeted 4-1BB ligand trimer-containing Fc fusion antigen binding molecules were also prepared as described in International Patent Appl. Publ. No. WO 2016/075278 A1. 
     In particular, the following molecules were made: 
     c) Monovalent FAP-Targeted 4-1BB Ligand Trimer-Containing Fc Fusion Antigen Binding Molecules 
     The variable region of heavy and light chain DNA sequences encoding a binder specific for FAP, clone 28H1 or clone 4B9, were subcloned in frame with either the constant heavy chain of the hole or the constant light chain of human IgG1. The Pro329Gly, Leu234Ala and Leu235Ala mutations have been introduced in the constant region of the knob and hole heavy chains to abrogate binding to Fc gamma receptors according to the method described in WO 2012/130831.Combination of the dimeric ligand-Fc knob chain containing the S354C/T366W mutations, the monomeric CH1 fusion, the targeted anti-FAP-Fc hole chain containing the Y349C/T366S/L368A/Y407V mutations and the anti-FAP light chain allows generation of a heterodimer, which includes an assembled trimeric 4-1BB ligand and a FAP binding Fab (in analogy to  FIG. 1A ). 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 Monovalent FAP-4-1BBL Constructs 
               
            
           
           
               
               
               
            
               
                   
                 Example in WO 
                   
               
               
                   
                 2016/075278 
                 composed of 
               
               
                   
                   
               
            
           
           
               
               
               
            
               
                 mono FAP(4B9)- 
                 Example 2.1.4 
                 SEQ ID NO: 112, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 2.4) 
                 NO: 113 SEQ ID NO: 41 and 
               
               
                 (Charged variant) 
                   
                 SEQ ID NO: 42 
               
               
                 mono FAP(28H1)- 
                 Example 1.1 
                 SEQ ID NO: 114, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 1.2) 
                 NO: 115 SEQ ID NO: 43 and 
               
               
                   
                   
                 SEQ ID NO: 44 
               
               
                   
               
            
           
         
       
     
     d) Bivalent FAP-Targeted 4-1BB Ligand Trimer-Containing Fc Fusion Antigen Binding Molecules 
     The DNA sequences encoding the heavy and light chain variable regions of heavy and light chain specific a binder specific for FAP, clone 28H1 or clone 4B9, were subcloned in frame with either the constant heavy chain of the hole, the knob or the constant light chain of human IgG1. The Pro329Gly, Leu234Ala and Leu235Ala mutations were introduced in the constant region of the knob and hole heavy chains to abrogate binding to Fc gamma receptors according to the method described in WO 2012/130831. Furthermore, a polypeptide comprising two ectodomains of 4-1BB ligand was fused to the C-terminus of human IgG1 Fc hole chain and a polypeptide comprising one ectodomain of 4-1BB ligand was fused to the C-terminus of human IgG1 Fc knob chain. Combination of the anti-FAP huIgG1 hole dimeric ligand heavy chain containing the Y349C/T366S/L368A/Y407V mutations, the anti-FAP huIgG1 knob monomeric ligand heavy chain containing the S354C/T366W mutations and the anti-FAP light chains allowed generation of a heterodimer, which included an assembled trimeric 4-1BB ligand and two FAP binding Fabs ( FIG. 1D ). 
     
       
         
           
               
             
               
                 TABLE 4 
               
             
            
               
                   
               
               
                 Bivalent FAP-4-1BBL Constructs 
               
            
           
           
               
               
               
            
               
                   
                 Example in WO 
                   
               
               
                   
                 2016/075278 
                 composed of 
               
               
                   
                   
               
            
           
           
               
               
               
            
               
                 bi FAP(4B9)- 
                 Example 2.1.3 
                 2 x SEQ ID NO: 113, SEQ ID 
               
               
                 4-1BBL 
                 (Construct 2.3) 
                 NO: 116 and SEQ ID NO: 117 
               
               
                 bi FAP(28H1)- 
                 Example 1.1 
                 2 x SEQ ID NO: 115 SEQ ID 
               
               
                 4-1BBL 
                 (Construct 1.5) 
                 NO: 118 and SEQ ID NO: 119 
               
               
                   
               
            
           
         
       
     
     The production and characterization of the FAP-targeted 4-1BB ligand trimer-containing Fc fusion antigen binding molecules is described in detail in WO 2016/075278, Examples 1 to 6, respectively. 
     Example 2 
     Preparation, Purification and Characterization of Monovalent CD19-mu4-1BBL Antigen Binding Molecule (Yybrid Surrogate) 
     A CD19-targeted murine 4-1BB ligand trimer-containing Fc fusion antigen binding molecule was prepared as described in International Patent Appl. Publ. No. WO 2016/075278 A1. The DNA sequence encoding part of the ectodomain (amino acid 104-309, including the C160S mutation) of mouse 4-1BB ligand was synthetized according to the Q3U1Z9-1 sequence of Uniprot database. 
     A DNA sequence encoding the dimeric murine 4-1BB ligand fused to human CL domain was subcloned in frame with the human IgG1 heavy chain CH2 and CH3 domains on the knob (Merchant, Zhu et al. 1998). A polypeptide containing one ectodomain of the murine 4-1BB ligand was fused to the human IgG1-CH1 domain. The variable region of heavy and light chain DNA sequences encoding a binder specific for CD19, clone 8B8-018, were subcloned in frame with either the constant heavy chain of the hole or the constant light chain of human IgG1. The Pro329Gly, Leu234Ala and Leu235Ala mutations have been introduced in the constant region of the knob and hole heavy chains to abrogate binding to Fc gamma receptors according to the method described in WO 2012/130831.Combination of the dimeric ligand-Fc knob chain containing the S354C/T366W mutations, the monomeric CH1 fusion, the targeted anti-CD19-Fc hole chain containing the Y349C/T366S/L368A/Y407V mutations and the anti-CD19 light chain allows generation of a heterodimer, which includes an assembled trimeric murine 4-1BB ligand and a CD19 binding Fab ( FIG. 1F ). 
     The amino acid sequences for the hybrid surrogate CD19-mu4-1BBL can be found in Table 5. 
     
       
         
           
               
             
               
                 TABLE 5 
               
             
            
               
                   
               
               
                 Amino acid sequences of mature hybrid 
               
               
                 surrogate CD19-mu4-1BBL 
               
            
           
           
               
               
               
            
               
                 SEQ ID 
                   
                   
               
               
                 NO: 
                 Description 
                 Sequence 
               
               
                   
               
               
                 60 
                 di-mu4-1BBL-CL 
                 RTEPRPALTITTSPNLGTRENNADQVTPVSHIGCPNTTQQ 
               
               
                   
                 Fc knob chain 
                 GSPVFAKLLAKNQASLSNTTLNWHSQDGAGSSYLSQGLRY 
               
               
                   
                   
                 EEDKKELVVDSPGLYYVFLELKLSPTFTNTGHKVQGWVSL 
               
               
                   
                   
                 VLQAKPQVDDFDNLALTVELFPCSMENKLVDRSWSQLLLL 
               
               
                   
                   
                 KAGHRLSVGLRAYLHGAQDAYRDWELSYPNTTSFGLFLVK 
               
               
                   
                   
                 PDNPWEGGGGSGGGGSRTEPRPALTITTSPNLGTRENNAD 
               
               
                   
                   
                 QVTPVSHIGCPNTTQQGSPVFAKLLAKNQASLSNTTLNWH 
               
               
                   
                   
                 SQDGAGSSYLSQGLRYEEDKKELVVDSPGLYYVFLELKLS 
               
               
                   
                   
                 PTFTNTGHKVQGWVSLVLQAKPQVDDFDNLALTVELFPCS 
               
               
                   
                   
                 MENKLVDRSWSQLLLLKAGHRLSVGLRAYLHGAQDAYRDW 
               
               
                   
                   
                 ELSYPNTTSFGLFLVKPDNPWEGGGGSGGGGSRTVAAPSV 
               
               
                   
                   
                 FIFPPSDRKLKSGTASVVCLLNNFYPREAKVQWKVDNALQ 
               
               
                   
                   
                 SGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACE 
               
               
                   
                   
                 VTHQGLSSPVTKSFNRGECDKTHTCPPCPAPEAAGGPSVF 
               
               
                   
                   
                 LFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDG 
               
               
                   
                   
                 VEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKC 
               
               
                   
                   
                 KVSNKALGAPIEKTISKAKGQPREPQVYTLPPCRDELTKN 
               
               
                   
                   
                 QVSLWCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSD 
               
               
                   
                   
                 GSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSL 
               
               
                   
                   
                 SLSPGK 
               
               
                   
               
               
                 61 
                 mono-mu4- 
                 RTEPRPALTITTSPNLGTRENNADQVTPVSHIGCPNTTQQ 
               
               
                   
                 1BBL-CH1 chain 
                 GSPVFAKLLAKNQASLSNTTLNWHSQDGAGSSYLSQGLRY 
               
               
                   
                   
                 EEDKKELVVDSPGLYYVFLELKLSPTFTNTGHKVQGWVSL 
               
               
                   
                   
                 VLQAKPQVDDFDNLALTVELFPCSMENKLVDRSWSQLLLL 
               
               
                   
                   
                 KAGHRLSVGLRAYLHGAQDAYRDWELSYPNTTSFGLFLVK 
               
               
                   
                   
                 PDNPWEGGGGSGGGGSASTKGPSVFPLAPSSKSTSGGTAA 
               
               
                   
                   
                 LGCLVEDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYS 
               
               
                   
                   
                 LSSVVTVPSSSLGTQTYICNVNHKPSNTKVDEKVEPKSCQ 
               
               
                   
                   
                 VQLVQSGAEVKKPGASVKVSCKASGYTFTDYIMHWVRQ 
               
               
                   
               
               
                 33 
                 anti-CD 19 
                 APGQGLEWMGYINPYNDGSKYTEKFQGRVTMTSDTSISTA 
               
               
                   
                 (8B8-018) Fc 
                 YMELSRLRSDDTAVYYCARGTYYYGSALFDYWGQGTTVTV 
               
               
                   
                 hole chain 
                 SSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVT 
               
               
                   
                   
                 VSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGT 
               
               
                   
                   
                 QTYICNVNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPEAA 
               
               
                   
                   
                 GGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKF 
               
               
                   
                   
                 NWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLN 
               
               
                   
                   
                 GKEYKCKVSNKALGAPIEKTISKAKGQPREPQVCTLPPSR 
               
               
                   
                   
                 DELTKNQVSLSCAVKGFYPSDIAVEWESNGQPENNYKTTP 
               
               
                   
                   
                 PVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEALHNH 
               
               
                   
                   
                 YTQKSLSLSPGK 
               
               
                   
               
               
                 34 
                 anti-CD19 
                 DIVMTQTPLSLSVTPGQPASISCKSSQSLENPNGNTYLNW 
               
               
                   
                 (8B8-018) 
                 YLQKPGQSPQLLIYRVSKRFSGVPDRFSGSGSGTDFTLKI 
               
               
                   
                 light chain 
                 SRVEAEDVGVYYCLQLTHVPYTFGQGTKLEIKRTVAAPSV 
               
               
                   
                   
                 FIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQ 
               
               
                   
                   
                 SGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACE 
               
               
                   
                   
                 VTHQGLSSPVTKSFNRGEC 
               
               
                   
               
            
           
         
       
     
     The hybrid surrogate CD19-mu4-1BBL was produced by co-transfecting CHO-Kl cells growing in suspension with the mammalian expression vectors using eviFect (Evitria AG). The cells were transfected with the corresponding expression vectors in a 1:1:1:1 ratio (“vector Fc-hole heavy chain”: “vector CD19 light chain”: “vector 4-1BBL Fc-knob heavy chain”: “vector mu4-1BBL light chain”). For transfection CHO-K1 cells are cultivated in suspension serum free in eviMake (Evitria AG) culture medium. After 7 days at 37° C. in an incubator with a 5% CO 2  atmosphere, cultivation supernatant is collected for purification by centrifugation and the solution is sterile filtered (0.22 mm filter) and kept at 4° C. Secreted proteins were purified from cell culture supernatants by affinity chromatography using Protein A, followed by size exclusion chromatography. For affinity chromatography, the supernatant was loaded on a Protein A MabSelectSure column (GE Healthcare) equilibrated with 20 mM sodium phosphate, 20 mM sodium citrate pH 7.5. Unbound protein was removed by washing with 20 mM sodium phosphate, 20 mM sodium citrate containing buffer (pH 7.5). The bound protein was eluted using a linear pH-gradient of sodium chloride of 20 mM sodium citrate, 100 mM NaCl, 100 mM Glycine, 0.01% Tween20 pH 3.0. The column was then washed with 20 mM sodium citrate, 100 mM NaCl, 100 mM glycine, 0.01% Tween20 pH 3.0. The pH of collected fractions was adjusted by adding 1/40 (v/v) of 2M Tris, pH8.0. The protein was concentrated and filtered prior to loading on a HiLoad Superdex column (GE Healthcare) equilibrated with 20 mM Histidine, 140 mM NaCl, 0.01% Tween20 pH6.0. 
     The protein concentration of purified bispecific constructs was determined by measuring the OD at 280 nm, using the molar extinction coefficient calculated on the basis of the amino acid sequence. Purity and molecular weight of the bispecific constructs were analyzed by CE-SDS in the presence and absence of a reducing agent (Invitrogen, USA) using a LabChipGXII (Caliper). The aggregate content of bispecific constructs was analyzed using a TSKgel G3000 SW XL analytical size-exclusion column (Tosoh) equilibrated in a 25 mM K 2 HPO 4 , 125 mM NaCl, 200 mM L-arginine monohydrocloride, 0.02% (w/v) NaN 3 , pH 6.7 running buffer at 25° C. 
     
       
         
           
               
             
               
                 TABLE 6 
               
             
            
               
                   
               
               
                 Biochemical analysis of hybrid surrogate CD19-mu4-1BBL 
               
            
           
           
               
               
               
               
               
            
               
                   
                   
                 Monomer 
                 Yield 
                 CE-SDS 
               
               
                   
                 Molecule 
                 [%] 
                 [mg/1] 
                 (non-red) 
               
               
                   
                   
               
               
                   
                 CD19-mu4-1BBL 
                 99 
                 3.5 
                 92 
               
               
                   
                   
               
            
           
         
       
     
     Functional Characterization of Hybrid Surrogate CD19-mu4-1BBL by Surface Plasmon Resonance: 
     The capacity of binding simultaneously murine 4-1BB Fc(kih) and human CD19 was assessed by surface plasmon resonance (SPR). All SPR experiments were performed on a Biacore T200 at 25° C. with HBS-EP as running buffer (0.01 M HEPES pH 7.4, 0.15 M NaCl, 3 mM EDTA, 0.005% Surfactant P20, Biacore, Freiburg/Germany). Biotinylated murine 4-1BB Fc(kih) was directly coupled to a flow cell of a streptavidin (SA) sensor chip. Immobilization levels up to 600 resonance units (RU) were used. The CD19-targeted mu4-1BBL construct was passed at a concentration range of 200 nM with a flow of 30 μL/minute through the flow cells over 90 seconds and dissociation was set to zero sec. Monomeric human CD19-Fc(kih) was injected as second analyte with a flow of 30 μL/minute through the flow cells over 90 seconds at a concentration of 500 nM ( FIG. 2A ). The dissociation was monitored for 120 sec. Bulk refractive index differences were corrected for by subtracting the response obtained in a reference flow cell, where no protein was immobilized. As can be seen in the graph of  FIG. 2B , the hybrid surrogate CD19-mu4-1BBL can bind simultaneously murine 4-1BB and human CD19. 
     Example 3 
     Combination Therapy of CD19-4-1BBL and Rituximab or Obinutuzumab In Vitro Activation of NK Cells 
     CD19-4-1BBL is active when it can cross-link on CD19 expressing NHL cells. Antibodies such as rituximab or obinituzumab (Gazyva) bind to CD20 on NHL cells and can thereby activate NK cells to mediate ADCC. Activated NK cells express 4-1BB. Our hypothesis is that CD19-4-1BBL can synergize with anti-CD20 ADCC mediating antibodies for NK cell activation. To test this, we used 3 different NHL cell lines, e.g. WSU-DLCL2 (CD19 + CD20 high ), SU-DHL-8 (CD19 + CD20 low ), and Naml-6 (CD19 + CD20 low ). To measure the biological activity of activated NK cells, we incubated the respective NHL cells with purified PBMCs from fresh healthy blood at a ration of 1:25 for 24 hours, in the presence of dose-titrated rituximab or obinutuzumab alone, or adding dose-titrated CD19-4-1BBL on top of the EC 50  concentration of rituximab or obinutuzumab, in IMDM medium (Gibco, Cat No. 31980-048) +10% FBS (Gibco, Cat No. 16140-071) and 1% penicillin-Streptomycin (Gibco, Cat No. 15070-063). The supernatants were collected for the measurement of IFN-γ by ELISA (DuoSet Human IFN-γ ELISA kit, R&amp;D Systems, Cat No. DY285).  FIG. 3A ,  FIG. 3B ,  FIG. 3C  shows that in all three NHL cell lines tested, CD19-4-1BBL could boost the effector function of NK cells for IFN-γ production that were activated by rituximab or obinutuzumab (Gazyva). On CD20 low  cells such as SU-DHL-8 and Nalm-6, the combination with obinutuzumab induced higher IFN-γ production than the combination with rituximab. 
     To confirm that CD19-4-1BBL is only able to activate NK cells after the addition of ADCC mediating antibodies, we measured the activation markers such as CD25 on NK cells (gated on CD3 − CD56 dim ). Consistent with the IFN-γ production, CD19-4-1BBL could only boost the activation of NK cells by upregulating CD25 that were already activated by rituximab or obinutuzumab ( FIG. 4A ,  FIG. 4B ,  FIG. 4C ). In contrast, T cells (both CD4 and CD8) showed no activation in terms of CD25 or CD69 in this co-culture (data not shown). 
     We also studied whether the targeted CD19-4-1BBL is superior to the 4-1BB agonistic antibody urelumab in synergizing the ADCC function of NK cells with obinutuzumab. In a similar experiment as we did above, we observed that only the combination of CD19-4-1BBL with obinutuzumab boosted NK cell activation (CD25 upregulation), but not the combination of urelumab with obinutuzumab ( FIG. 5A ,  FIG. 5B ,  FIG. 5C ). 
     Example 4 
     Combination Therapy of Hybrid CD19-4-1BBL and Rituximab In Vivo 
     The first proof on concept for the combination of hybrid CD19-4-1BBL (monovalent CD19-mu4-1BBL) and rituximab was carried out in tumor-bearing huCD16tgScid mice. 
     WSU-DLCL2 cells (human diffuse large B cell lymphoma) were originally obtained from ECACC (European Collection of Cell Culture) and after expansion deposited in the internal cell bank of Roche Glycart AG. Cells were cultured in RPMI containing 10% FCS and 1× Glutamax. The cells were cultured at 37° C. in a water-saturated atmosphere at 5% CO 2 . 1.5×10 6  cells per animal were injected s.c. into the right flank of the animals in RPMI cell culture medium (Gibco) and GFR matrigel (1:1, total volume of 100 ul) at a viability of &gt;95.0%. 
     Human FcγRIIIa (CD16) transgenic SCID mice (which express both murine FcγRIV-positive macrophages and human FcγRIIIa-positive transgenic murine NK cells as effectors) in the age of 8-10 weeks at start of the experiment (bred at Charles River, France) were maintained under specific-pathogen-free condition with daily cycles of 12 h light/12 h darkness according to committed guidelines (GV-Solas; Felasa; TierschG). The experimental study protocol was reviewed and approved by local government. After arrival, animals were maintained for one week to get accustomed to the new environment and for observation. Continuous health monitoring was carried out on a regular basis. 
     According to the protocol ( FIG. 6 ), female huCD16TgScid mice were injected with tumor cells s.c. as described above and treated once weekly with the compounds or PBS (Vehicle) when tumor size reached appr. 200 mm 3  (day 13). All mice were injected i.v. with 200 μl of the appropriate solution once per week. To obtain the proper amount of compounds per 200 μl, the stock solutions (Table 5) were diluted with PBS when necessary. For combination therapy (Group D,  FIG. 6 ) with rituximab and hybrid CD19-4-1BBL construct, therapies were injected with a gap of one day. Tumor growth was measured twice weekly using a caliper and tumor volume was calculated as followed: 
         T   v : ( W   2 /2)× L  (W: Width, L: Length)
 
     The study was terminated and all mice were sacrificed after eight injections of the compounds (day 64 after tumor cell injection) and tumors were explanted and weighted.  FIG. 7A  and  FIG. 7B  show the tumor growth kinetics (Mean+/−SEM) in all treatment groups as well as the tumor weights at study termination. Monotherapy of hybrid CD19-4-1BBL did not reveal any tumor growth inhibition. Monotherapy of rituximab induced slower tumor growth compared to vehicle. The combination of rituximab and hybrid CD19-4-1BBL however, induced statistically significant tumor growth inhibition and revealed significant lower tumor weight at study termination as compared to all other treatment groups. 
     
       
         
           
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                 Compositions used in the in vivo experiment 
               
            
           
           
               
               
               
            
               
                 Compound 
                 Formulation buffer 
                 Concentration (mg/mL) 
               
               
                   
               
               
                 hybrid CD19- 
                 20 mM Histidine, 
                 4.11 
               
               
                 4-1BBL 
                 140 mM NaCl, pH 6.0 
                 (=stock solution) 
               
               
                 Rituximab 
                 20 mM Histidine, 
                 10    
               
               
                   
                 140 mM NaCl, pH 6.0 
                 (=stock solution) 
               
               
                   
               
            
           
         
       
     
     Example 5 
     Combination Therapy of Monovalent CD19(2B11)-4-1BBL and Obinutuzumab (Gazyva) in Vivo 
     The proof on concept for the combination of mono CD19(2B11)-4-1BBL and GAZYVA was carried out in fully humanized NSG mice. 
     WSU-DLCL2 cells (human diffuse large B cell lymphoma) were originally obtained from ECACC (European Collection of Cell Culture) and after expansion deposited in the Roche Glycart internal cell bank. Cells were cultured in RPMI containing 10% FCS and 1× Glutamax. The cells were cultured at 37° C. in a water-saturated atmosphere at 5% CO 2 . 1.5×10 6  cells (in vitro passage 18) per animal were injected s.c. into the right flank of the animals in RPMI cell culture medium (Gibco) and GFR matrigel (1:1, total volume of 100 μl) at a viability of &gt;95.0%. 
     Female NOD/Shi-scid/IL-2Rγnull (NSG) mice at the age of 4-5 weeks at start of the experiment (bred at Taconic, Denmark) were maintained under specific-pathogen-free condition with daily cycles of 12 h light/12 h darkness according to committed guidelines (GV-Solas; Felasa; TierschG). The experimental study protocol was reviewed and approved by local government (ZH193/2014). After arrival, animals were maintained for one week to get accustomed to the new environment and for observation. Continuous health monitoring was carried out on a regular basis. 
     According to the protocol ( FIG. 8 ), female NSG mice were injected i.p. with 15 mg/kg of Busulfan followed one day later by an i.v. injection of 1×10 5  human hematopoietic stem cells isolated from cord blood. At week 14-16 after stem cell injection mice were bled sublingual and blood was analyzed by flow cytometry for successful humanization. Efficiently engrafted mice were randomized according to their human T cell frequencies into the different treatment groups ( FIG. 8 , n: 10/group). At that time, mice were injected with tumor cells s.c. as described above and treated once weekly with the compounds or PBS (Vehicle) when tumor size reached appr. 450 mm 3  (day 11). All mice were injected i.v. with 200 μl of the appropriate solution. To obtain the proper amount of compounds per 200 μl, the stock solutions (Table 6) were diluted with PBS when necessary. For combination therapies (Group D,  FIG. 8 ) with GAZYVA, the CD19-4-1BBL construct was injected concomitant. Tumor growth was measured twice weekly using a caliper and tumor volume was calculated as followed: 
         T   v : ( W   2 /2)× L  (W: Width, L: Length)
 
       FIG. 9  shows the tumor growth kinetics (Mean+/−SEM) in all treatment groups. No monotherapeutic effects of CD19-4-1BBL could be detected. Obinutuzumab, as a single agent, induced little tumor growth inhibition, however, the combination with CD19-4-1BBL induced complete tumor regression in all animals ( FIG. 9 ). 
     
       
         
           
               
             
               
                 TABLE 8 
               
             
            
               
                   
               
               
                 Compositions used in this experiment 
               
            
           
           
               
               
               
            
               
                 Compound 
                 Formulation buffer 
                 Concentration (mg/mL) 
               
               
                   
               
               
                 mono CD19 (2B11)- 
                 20 mM Histidine, 
                 5.16 
               
               
                 4-1BBL 
                 140 mM NaCl, pH 6.0 
                 (=stock solution) 
               
               
                 obinutuzumab 
                 20 mM Histidine, 
                 25    
               
               
                 (Gazyva) 
                 140 mM NaCl, pH 6.0 
                 (=stock solution)