HUMANIZED ANTI-ErbB2 ANTIBODIES AND TREATMENT WITH ANTI-ErbB2 ANTIBODIES

Abstract: The present application describes humanized anti-ErbB2 antibodies and methods for treating cancer with anti-ErbB2 antibodies, such as humanized anti-ErbB2 antibodies.

Description: HUMANIZED A TI-ErbB2 ANTIBODIES AND TREATMENT WITH ANTI-ErbB2 ANTIBODIES Field of the Invention The present invention concerns humanized antι-ErbB2 antibodies and methods for treating cancer with antι-ErbB2 antibodies, such as humanized antι-ErbB2 antibodies Background of the Invention The ErbB family of receptor tyrosine kinases are important mediators of cell growth, differentiation and survival. The receptor family includes four distinct members including epidermal growth factor receptor (EGFR or ErbB l), HER2 (ErbB2 or pl 85" e "), HER3 (ErbB3) and HER4 (ErbB4 or tyro2). EGFR, encoded by the erb 1 gene, has been causally implicated in human malignancy. In particular, increased expression of EGFR has been observed in breast, bladder, lung, head, neck and stomach cancer as well as glioblastomas. Increased EGFR receptor expression is often associated with increased production of the EGFR hgand, transforming growth factor alpha (TGF-α), by the same tumor cells resulting in receptor activation by an autocπne stimulatory pathway. Baselga and Mendelsohn Pharmac. Ther. 64.127-154 (1994). Monoclonal antibodies directed against the EGFR or its hgands, TGF-α and EGF, have been evaluated as therapeutic agents in the treatment of such malignancies See, e.g., Baselga and Mendelsohn., supra; Masui et al. Cancer Research 44.1002-1007 ( 1984); and W et al. J. Clin. Invest 95: 1897-1905 ( 1995). The second member of the ErbB family, pi 85 , was originally identified as the product of the transforming gene from neuroblastomas of chemically treated rats. The activated form of the neu proto-oncogene results from a point mutation (va ne to glutamic acid) in the transmembrane region of the encoded protein Amplification of the human homolog of neu is observed in breast and ovarian cancers and correlates with a poor prognosis (S\ tmon eta , Science, 235.177-182 (1987); Slamon etai, Science, 244:707-712 (1989); and US Pat No. 4,968,603). To date, no point mutation analogous to that in the neu proto-oncogene has been reported for human tumors. Overexpression of ErbB2 (frequently but not uniformly due to gene amplification) has also been observed in other carcinomas including carcinomas ofthe stomach, endometπum, salivary gland, lung, kidney, colon, thyroid, pancreas and bladder. See, among others, King et al, Science, 229:974 (1985); Yokota et al, Lancet: 1 :765-767 (1986); Fukushigi et i, Mol Cell BioL, 6:955-958 (1986), Geurm etal., Oncogene Res., 3:21-31 (1988), Cohen et al, Oncogene, 4:81 -88 (1989); Yonemura etai, Cancer Res., 51 : 1034 (1991); Borstet at, Gynecol. Oncol., 38:364 (1990); Werner etai, Cancer Res., 50.421-425 (1990); Kern etai, Cancer Res., 50:5184 (1990); Park et al, Cancer Res., 49:6605 (1989); Zhau et al , Mol Carcinog., 3:354-357 (1990); Aasland et al. Br. J. Cancer 57:358-363 (1988); Williams et al Pathiobiology 59:46-52 (1991); and McCann et al, Cancer, 65:88-92 (1990). ErbB2 may be overexpressed in prostate cancer (Gu et ai Cancer Lett. 99: 185-9 (1996); Ross et ai Hum. Pathol 28:827-33 (1997), Ross et ai. Cancer 79:2162-70 (1997); and Sadasivan et ai J. Urol 150:126-31 (1993)). Antibodies directed against the rat p 185 and human ErbB2 protein products have been described. Drebin and colleagues have raised antibodies against the rat neu gene product, pi 85 See, for example, Drebin et al, Cell 41 :695-706 (1985); Myers etal, Meth. Enzym 198.277-290 (1991), and W094/22478. Drebin etai Oncogene 2:273-277 ( 1988) report that mixtures of antibodies reactive with two distinct regions of pi 85 result in synergistic anti-tumor effects on new-transformed NIH-3T3 cells implanted into nude mice. See also U.S. Patent 5,824,31 1 issued October 20, 1998. Hudziak et al, Mol Cell. Bwl 9(3).1 165-1 172 (1989) describe the generation of a panel of antι-ErbB2 antibodies which were characterized using the human breast tumor cell line SK-BR-3. Relative cell proliferation of the SK-BR-3 cells following exposure to the antibodies was determined by crystal violet staining ofthe monolayers after 72 hours Using this assay, maximum inhibition was obtained with the antibody called 4D5 which inhibited cellular proliferation by 56%. Other antibodies in the panel reduced cellular proliferation to a lesser extent in this assay The antibody 4D5 was further found to sensitize ErbB2-overexpressιng breast tumor cell lines to the cytotoxic effects of TNF-α. See also U.S. Patent No 5,677,171 issued October 14, 1997. The antι-ErbB2 antibodies discussed in Hudziak et al. are further characterized in Fendly et al. Cancer Research 50.1550-1558 ( 1990), Kotts et ai In Vitro 26(3).59A (1990); Sarup et ai Growth Regulation 1.72-82 (1991 ); Shepard et ai J. Clin. Immunol 1 1(3): 1 17-127 ( 1991); Kumar et al. Mol Cell. Bwl 1 1(2):979-986 ( 1991), Lewis et al. Cancer Immunol. Immunother. 37.255-263 (1993); Pietras et al. Oncogene 9: 1829-1838 (1994); Vitetta et al Cancer Research 54:5301-5309 (1994); Sliwkowski et ai J. Bwl Chem. 269(20): 14661 -14665 (1994); Scott et ai J. Bwl Chem 266.14300-5 (1991), D'souza et al Proc. Nat Acad. Sci. 91.7202-7206 (1994); Lewis et al. Cancer Research 56: 1457-1465 (1996), and Schaefer er a/. Oncogene 15.1385-1394 (1997). A recombinant humanized version ofthe muπne antι-ErbB2 antibody 4D5 (huMAb4D5-8, rhuMAb HER2 or HERCEPTIN ® ; U.S. Patent No. 5,821 ,337) is clinically active in patients with ErbB2-overexpressιng metastatic breast cancers that have received extensive prior anti-cancer therapy (Baselga et al , J. Clin Oncol 14:737-744 ( 1996)) HERCEPTIN received marketing approval from the Food and Drug Administration September 25 , 1998 for the treatment of patients with metastatic breast cancer whose tumors overexpress the ErbB2 protein. Other antι-ErbB2 antibodies with various properties have been described in Taghabue et al. Int. J. Cancer 47:933-937 (1991 ); McKenzie et ai Oncogene 4:543-548 (1989); Maier et ai Cancer Res. 51 :5361-5369 (1991 ); Bacus et al Molecular Carctnogenesis 3:350-362 (1990); Stancovski et al PNAS (USA) 88:8691 -8695 ( 1991 ), Bacus et al. Cancer Research 52:2580-2589 (1992); Xu et al. Int. J. Cancer 53:401-408 (1993); WO94/00136, Kasprzyk et al. Cancer Research 52:2771 -2776 ( 1992);Hancock ef al Cancer Res.51 :4575-4580 ( 1991 ); Shawver et ai Cancer Res. 54.1367-1373 (1994); Arteaga et ai. Cancer Res. 54:3758-3765 (1994); Harwerth et ai J Bwl. Chem. 267: 15160-15167 (1992); U.S. Patent No. 5,783,186; and Klapper et ai Oncogene 14:2099-2109 (1997). Homology screening has resulted in the identification of two other ErbB receptor family members; ErbB3 (US Pat. Nos. 5,183,884 and 5,480,968 as well as Kraus et ai. PNAS (USA) 86:9193-9197 (1989)) and ErbB4 (EP Pat Appln No 599,274; Plowman et al, Proc. Natl Acad. Set. USA, 90:1746-1750 (1993); and Plowman et al, Nature, 366 473-475 (1993)) Both of these receptors display increased expression on at least some breast cancer cell lines The ErbB receptors are generally found in various combinations in cells and heterodimeπzation is thought to increase the diversity of cellular responses to a variety of ErbB ligands (Earp et al Breast Cancer Research and Treatment 35 1 15-132 (1995)) EGFR is bound by six different ligands, epidermal growth factor (EGF), transforming growth factor alpha (TGF α), amphiregulin, hepaπn binding epidermal growth factor (HB-EGF), betacelluhn and epireguhn (Groenen et al Growth Factors 1 1 235-257 ( 1994)) A family of heregulin proteins resulting from alternative splicing of a single gene are ligands for ErbB3 and ErbB4 The heregulin family includes alpha, beta and gamma hereguhns (Holmes et al , Science, 256 1205-1210 ( 1992), U S Patent No 5,641 ,869, and Schaefer et al Oncogene 15 1385-1394 (1997)), neu differentiation factors (NDFs), ghal growth factors (GGFs), acetylcholme receptor inducing activity (ARIA), and sensory and motor neuron derived factor (SMDF) For a review, see Groenen et al Growth Factors 1 1 235-257 (1994), Lemke, G Molec & Cell Neurosci 7 247-262 (1996) and Lee et al Pharm Rev 47 51-85 (1995) Recently three additional ErbB ligands were identified, neureguhn-2 (NRG-2) which is reported to bind either ErbB3 or ErbB4 (Chang et al Nature 387 509-512 (1997), and Carraway et al Nature 387 512-516 (1997)), neuregulιn-3 which binds ErbB4 (Zhang et al PNAS (USA) 94(18) 9562-7 (1997)), and neuregulιn-4 which binds ErbB4 (Haraπ etai Oncogene 18 2681-89 ( 1999)) HB-EGF, betacelluhn and epireguhn also bind to ErbB4 While EGF and TGFα do not bind ErbB2, EGF stimulates EGFR and ErbB2 to form a heterodimer, which activates EGFR and results in transphosphorylation of ErbB2 in the heterodimer Dimeπzation and/or transphosphorylation appears to activate the ErbB2 tyrosine kinase See Earp et al , supra Likewise, when ErbB3 is co-expressed with ErbB2, an active signaling complex is formed and antibodies directed against ErbB2 are capable of disrupting this complex (Sliwkowski ef α/ , J Bwl Chem , 269(20) 14661 -14665 (1994)) Additionally, the affinity of ErbB3 for heregulin (HRG) is increased to a higher affinity state when co-expressed with ErbB2 See also, Levi f α/ , Journal of Neuroscience 15 1329-1340 (1995), Mornssey et ai , Proc Natl Acad Sci USA 92 1431-1435 ( 1995), and Lewis et ai , Cancer Res , 56 1457-1465 (1996) with respect to the ErbB2-ErbB3 protein complex ErbB4, like ErbB3, forms an active signaling complex with ErbB2 (Carraway and Cantley, Cell 78 5-8 ( 1994)) Summary of the Invention In a first aspect, the present invention provides a method of treating cancer in a human, wherein the cancer expresses epidermal growth factor receptor (EGFR), comprising administering to the human a therapeutically effective amount of an antibody which binds ErbB2 Various advantages in using an antibody which binds ErbB2 to treat such cancer, as opposed to EGFR- targeted drugs, are contemplated herein In particular, EGFR is highly expressed in liver and skin and this provides an enormous sink for active drug where the drug binds to EGFR In addition, skin toxicity has been observed for other EGFR-targeted drugs such as the chimeπc anti-EGFR antibody C225 and the small molecule drug ZD1839 which binds EGFR Antibodies which bind ErbB2 are anticipated to have a better safety profile than such drugs Where the antibody used for therapy herein blocks ligand activation of an ErbB receptor and/or has a biological characteristic of monoclonal antibody 2C4, further advantages are achieved For example, while EGFR- targeted drugs interfere only with EGFR, the antibodies of particular interest herein (e g 2C4, including humanized and/or affinity matured variants thereof) will interfere with EGFR/ErbB2, ErbB3/ErbB4 and ErbB2/ErbB3 heterodimers In addition, the antibodies herein that bind ErbB2 and block ligand activation of an ErbB receptor will be complementary to EGFR -targeted drugs, where EGFR-targeted drugs are not complementary to each other The invention further provides a method of treating cancer in a human, wherein the cancer is not characterized by overexpression of the ErbB2 receptor, comprising administering to the human a therapeutically effective amount of an antibody which binds to ErbB2 and blocks ligand activation of an ErbB receptor In addition, the present invention provides a method of treating hormone independent cancer in a human comprising administering to the human a therapeutically effective amount of an antibody which binds ErbB2 receptor, and blocks ligand activation of an ErbB receptor The invention further provides a method of treating cancer in a human comprising administering to the human therapeutically effective amounts of (a) a first antibody which binds ErbB2 and inhibits growth of cancer cells which overexpress ErbB2, and (b) a second antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor The invention also provides a method of treating a cancer in a human, wherein the cancer is selected from the group consisting of colon, rectal and colorectal cancer, comprising administering to the human a therapeutically effective amount of an antibody which binds ErbB 2 and blocks ligand activation of an ErbB receptor In further embodiments, the invention provides articles of manufacture for use (among other things) in the above methods For example, the invention provides an article of manufacture comprising a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB2, and further comprising a package insert indicating that the composition can be used to treat cancer which expresses epidermal growth factor receptor (EGFR) The invention additionally pertains to an article of manufacture comprising a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, and further comprising a package insert indicating that the composition can be used to treat cancer, wherein the cancer is not characterized by overexpression of the ErbB2 receptor Also, the invention relates to an article of manufacture comprising a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, and further comprising a package insert indicating that the composition can be used to treat hormone independent cancer In a further embodiment, an article of manufacture is provided which comprises (a) a first container with a composition contained therein, wherein the composition comprises a first antibody which binds ErbB2 and inhibits growth of cancer cells which overexpress ErbB2, and (b) a second container with a composition contained therein, wherein the composition comprises a second antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor A further article of manufacture is provided which comprises a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, and further comprises a package insert indicating that the composition can be used to treat a cancer selected from the group consisting of colon, rectal and colorectal cancer The invention additionally provides a humanized antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, a composition comprising the humanized antibody and a pharmaceutically acceptable carrier, and an lmmunoconjugate comprising the humanized antibody conjugated with a cytotoxic agent Moreover, the invention provides isolated nucleic acid encoding the humanized antibody, a vector comprising the nucleic acid, a host cell comprising the nucleic acid or the vector, as well as a process of producing the humanized antibody comprising cultuπng a host cell comprising the nucleic acid so that the nucleic acid is expressed and, optionally, further comprising recovering the humanized antibody from the host cell culture (e g from the host cell culture medium) The invention further pertains to an lmmunoconjugate comprising an antibody which binds ErbB2 conjugated to one or more cahcheamicin molecules, and the use of such conjugates for treating ErbB2 expressing cancer, e g , ErbB2 overexpressing cancer, in a human Preferably, the antibody in the conjugate is monoclonal antibody 4D5, e g , humanized 4D5 (and preferably huMAb4D5-8 (HERCEPTIN®), or monoclonal antibody 2C4, e g , humanized 2C4 The antibody in the lmmunoconjugate may be an intact antibody (e g , an intact IgG j antibody) or an antibody fragment (e g a Fab, F(ab ) 2 , diabody etc) Brief Description of the Drawings Figures 1 A and IB depict epitope mapping of residues 22-645 within the extracellular domain (ECD) of ErbB2 (amino acid sequence, including signal sequence, shown in Fig 1A, SEQ ID NO 13) as determined by truncation mutant analysis and site-directed mutagenesis (Nakamura et al J of Virology 67(10) 6179-6191 (1993), and Renzerα/ J Cell Bwl 125(6) 1395-1406 (1994)) The various ErbB2-ECD truncations or point mutations were prepared from cDNA using polymerase chain reaction technology The ErbB2 mutants were expressed as gD fusion proteins in a mammalian expression plasmid This expression plasmid uses the cytomegalovirus promoter/enhancer with SV40 termination and polyadenylation signals located downstream of the inserted cDNA Plasmid DNA was transfected into 293 cells One day following transfection, the cells were metabolically labeled overnight in methionine and cysteine-free, low glucose DMEM containing 1 % dialyzed fetal bovine serum and 25 μCi each of 35 S methionine and 3, S cysteine Supernatants were harvested and either the antι-ErbB2 monoclonal antibodies or control antibodies were added to the supernatant and incubated 2-4 hours at 4 C The complexes were precipitated, applied to a 10-20% Tπcine SDS gradient gel and electrophoresed at 100 V The gel was electroblotted onto a membrane and analyzed by autoradiography As shown in Fig 1 B, the antι-ErbB2 antibodies 7C2, 7F3, 2C4, 7D3, 3E8, 4D5, 2H1 1 and 3H4 bind various ErbB2 ECD epitopes Figures 2A and 2B show the effect of antι-ErbB2 monoclonal antibodies 2C4 and 7F3 on rHRGβl activation of MCF7 cells Fig 2A shows dose-response curves for 2C4 or 7F3 inhibition of HRG stimulation of tyrosine phosphorylation Fig 2B shows dose-response curves for the inhibition of 125 I-labeled rHRGβl 177 2 binding to MCF7 cells by 2C4 or 7F3 125 Figure 3 depicts inhibition of specific I-labeled rHRGβl ηη 244 binding to a panel of human tumor cell lines by the antι-ErbB2 monoclonal antibodies 2C4 or 7F3 Monoclonal antibody-controls are isotype-matched 125 muπne monoclonal antibodies that do not block rHRG binding Nonspecific I-labeled rHRGβl 177 2 binding was determined from parallel incubations performed in the presence of 100 nM rHRGβl Values for nonspecific 125 I-labeled rHRGβl j77- 4 binding were less than 1 % of the total for all the cell lines tested Figures 4A and 4B show the effect of monoclonal antibodies 2C4 and 4D5 on proliferation of MDA-MB- 175 (Fig 4A) and SK-BR-3 (Fig 4B) cells MDA-MB-175 and SK-BR-3 cells were seeded in 96 well plates and allowed to adhere for 2 hours Experiment was carried out in medium containing 1 % serum Antι-ErbB2 antibodies or medium alone were added and the cells were incubated for 2 hours at 37 °C Subsequently rHRGβl (InM) or medium alone were added and the cells were incubated for 4 days Monolayers were washed and stained/fixed with 0 5% crystal violet To determine cell proliferation the absorbance was measured at 540 nm Figures 5A and 5B show the effect of monoclonal antibody 2C4, HERCEPTIN® antibody or an anti-EGFR antibody on heregulin (HRG) dependent association of ErbB2 with ErbB3 in MCF7 cells expressing low/normal levels of ErbB2 (Fig 5A) and SK-BR-3 cells expressing high levels of ErbB2 (Fig 5B), see Example 2 below Figures 6A and 6B compare the activities of intact muπne monoclonal antibody 2C4 (mu 2C4) and a 125 chimeπc 2C4 Fab fragment Fig 6A shows inhibition of I-HRG binding to MCF7 cells by chimeπc 2C4 Fab or intact muπne monoclonal antibody 2C4 MCF7 cells were seeded in 24-well plates ( 1 x 10 cells/well) and grown to about 85% confluency for two days Binding experiments were conducted as described in Lewis et al Cancer Research 56 1457-1465 (1996) Fig 6B depicts inhibition of rHRGβl activation of pi 80 tyrosine phosphorylation in MCF7 cells performed as described in Lewis et al Cancer Research 56 1457-1465 (1996) Figures 7 A and 7B depict alignments of the amino acid sequences of the variable light (V L ) (Fig 7 A) and variable heavy (V H ) (Fig 7B) domains of murine monoclonal antibody 2C4 (SEQ ID Nos 1 and 2, respectively), V L and V H domains of humanized 2C4 version 574 (SEQ ID Nos 3 and 4, respectively), and human V L and V H consensus frameworks (hum κl , light kappa subgroup I, humlll, heavy subgroup III) (SEQ ID Nos 5 and 6, respectively) Asterisks identify differences between humanized 2C4 version 574 and murine monoclonal antibody 2C4 or between humanized 2C4 version 574 and the human framework Complementarity Determining Regions (CDRs) are in brackets Figures 8A to C show binding of chimeπc Fab 2C4 (Fab vl ) and several humanized 2C4 variants to ErbB2 extracellular domain (ECD) as determined by ELISA in Example 3 Figure 9 is a ribbon diagram of the V L and V H domains of monoclonal antibody 2C4 with white CDR backbone labeled (Ll , L2, L3, HI , H2, H3) V H sidechains evaluated by mutagenesis during humanization (see Example 3, Table 2) are also shown Figure 10 depicts the effect of monoclonal antibody 2C4 or HERCEPTIN® on EGF, TGF-α, or HRG- mediated activation of mitogen-activated protein kinase (MAPK) Figure 1 1 is a bar graph showing the effect of antι-ErbB2 antibodies (alone or in combinations) on Calu3 lung adenocarcinoma xenografts (3+ ErbB2 overexpressor) Note treatment was stopped on day 24 Figure 12 depicts the effect of recombinant humanized monoclonal antibody 2C4 (rhuMAb 2C4) or HERCEPTIN® on the growth of MDA-175 cells as assessed in an Alamar Blue assay Figure 13 shows the efficacy of rhuMAb 2C4 against MCF7 xenografts Detailed Description of the Preferred Embodiments I. Definitions An "ErbB receptor" is a receptor protein tyrosine kinase which belongs to the ErbB receptor family and includes EGFR, ErbB2, ErbB3 and ErbB4 receptors and other members of this family to be identified in the future The ErbB receptor will generally comprise an extracellular domain, which may bind an ErbB ligand, a lipophilic transmembrane domain; a conserved mtracellular tyrosine kinase domain; and a carboxyl-terminal signaling domain harboring several tyrosine residues which can be phosphorylated. The ErbB receptor may be a "native sequence" ErbB receptor or an "amino acid sequence variant" thereof. Preferably the ErbB receptor is native sequence human ErbB receptor. The terms "ErbB 1 ", "epidermal growth factor receptor" and "EGFR" are used interchangeably herein and refer to EGFR as disclosed, for example, in Carpenter et al. Ann. Rev. Biochem. 56:881-914 (1987), including naturally occurring mutant forms thereof (e.g. a deletion mutant EGFR as in Humphrey etai PNAS (USA) 87.4207- 421 1 (1990)) erbB \ refers to the gene encoding the EGFR protein product. The expressions "ErbB2" and "HER2" are used interchangeably herein and refer to human HER2 protein described, for example, in Semba et al, PNAS (USA) 82 6497-6501 (1985) and Yamamoto et al Nature 319.230- 234 (1986) (Genebank accession number X03363). The term "er£B2" refers to the gene encoding human ErbB2 and "neu " refers to the gene encoding rat pl85 . Preferred ErbB2 is native sequence human ErbB2 "ErbB3" and "HER3" refer to the receptor polypeptide as disclosed, for example, in US Pat. Nos. 5,183,884 and 5,480,968 as well as Kraus et al. PNAS (USA) 86.9193-9197 (1989) The terms "ErbB4" and "HER4" herein refer to the receptor polypeptide as disclosed, for example, in EP Pat Appln No 599,274; Plowman et al, Proc. Natl Acad. Sci. USA, 90: 1746-1750 (1993), and Plowman et al, Nature, 366:473-475 (1993), including isoforms thereof, e.g., as disclosed in W099/19488, published April 22, 1999. By "ErbB ligand" is meant a polypeptide which binds to and/or activates an ErbB receptor. The ErbB ligand of particular interest herein is a native sequence human ErbB ligand such as epidermal growth factor (EGF) (Savage et ai, J. Btol Chem. 247:7612-7621 (1972)); transforming growth factor alpha (TGF-α) (Marquardt et al, Science 223: 1079-1082 (1984)); amphireguhn also known as schwanoma or keratinocyte autocπne growth factor (Shoyab et al Science 243: 1074- 1076 ( 1989), Kimura et al Nature 348:257-260 ( 1990); and Cook et al. Mol. Cell. Bwl. 1 1 :2547-2557 (1991 )); betacelluhn (Shing et ai, Science 259: 1604-1607 ( 1993); and Sasada ef al. Biochem Biophys. Res. Commun. 190: 1 173 ( 1993)); hepaπn-binding epidermal growth factor (HB-EGF) (Higashiyama etai. Science 251 :936-939 (1991)); epireguhn (Toyoda et ai, J. Bwl. Chem. 270.7495-7500 ( 1995); and Komurasaki et al Oncogene 15:2841-2848 ( 1997)); a heregulin (see below); neuregulιn-2 (NRG-2) (Carraway et al, Nature 387:512-516 (1997)); neuregulιn-3 (NRG-3) (Zhang etai, Proc. Natl Acad. Sci. 94-9562-9567 (1997)), neureguhn- 4 (NRG-4) (Haraπ et al Oncogene 18:2681 -89 ( 1999)) or cπpto (CR- 1 ) (Kannan et al J. Bwl Chem. 272(6):3330- 3335 ( 1997)). ErbB ligands which bind EGFR include EGF, TGF-α, amphireguhn, betacelluhn, HB-EGF and epireguhn. ErbB ligands which bind ErbB3 include heregulins. ErbB ligands capable of binding ErbB4 include betacelluhn, epireguhn, HB-EGF, NRG-2, NRG-3, NRG-4 and heregulins. "Heregulin" (HRG) when used herein refers to a polypeptide encoded by the heregulin gene product as disclosed in U.S. Patent No. 5,641,869 or Marchionni et ai, Nature, 362:312-318 (1993). Examples of heregulins include hereguhn-α, heregulm-βl, hereguhn-β2 and heregulιn-β3 (Holmes et al, Science, 256: 1205-1210 ( 1992), and U.S. Patent No. 5,641 ,869); neu differentiation factor (NDF) (Peles et al Cell 69. 205-216 ( 1992)); acetylcholme receptor-inducing activity (ARIA) (Falls et al. Cell 72:801-815 (1993)); glial growth factors (GGFs) (Marchionni etai , Nature, 362:312-318 (1993)); sensory and motor neuron derived factor (SMDF) (Ho et al. J. Biol Chem. 270: 14523-14532 (1995)); γ-hereguhn (Schaefer ef α/. Oncogene 15:1385-1394 (1997)). The term includes biologically active fragments and/or amino acid sequence variants of a native sequence HRG polypeptide, such as an EGF-hke domain fragment thereof (e g HRGβl 177- 4 ) An "ErbB hetero-ohgomer" herein is a noncovalently associated ohgomer comprising at least two different ErbB receptors Such complexes may form when a cell expressing two or more ErbB receptors is exposed to an ErbB ligand and can be isolated by immunoprecipitation and analyzed by SDS-PAGE as described in Shwkowski et al , J Bwl Chem , 269(20) 14661-14665 (1994), for example Examples of such ErbB hetero-oligomers include EGFR-ErbB2, ErbB2-ErbB3 and ErbB3-ErbB4 complexes Moreover, the ErbB hetero- ohgomer may comprise two or more ErbB2 receptors combined with a different ErbB receptor, such as ErbB3, ErbB4 or EGFR Other proteins, such as a cytokine receptor subunit (e g gpl 30) may be included in the hetero- ohgomer By "ligand activation of an ErbB receptor" is meant signal transduction (e g that caused by an mtracellular kinase domain of an ErbB receptor phosphorylating tyrosine residues in the ErbB receptor or a substrate polypeptide) mediated by ErbB ligand binding to a ErbB hetero-ohgomer comprising the ErbB receptor of interest Generally, this will involve binding of an ErbB ligand to an ErbB hetero-ohgomer which activates a kinase domain of one or more of the ErbB receptors in the hetero-ohgomer and thereby results in phosphorylation of tyrosine residues in one or more of the ErbB receptors and/or phosphorylation of tyrosine residues in additional substrate polypeptιdes(s) ErbB receptor activation can be quantified using various tyrosine phosphorylation assays A "native sequence" polypeptide is one which has the same amino acid sequence as a polypeptide (e g , ErbB receptor or ErbB ligand) derived from nature Such native sequence polypeptides can be isolated from nature or can be produced by recombinant or synthetic means Thus, a native sequence polypeptide can have the amino acid sequence of naturally occurring human polypeptide, murine polypeptide, or polypeptide from any other mammalian species The term "amino acid sequence variant" refers to polypeptides having amino acid sequences that differ to some extent from a native sequence polypeptide Ordinarily, amino acid sequence variants will possess at least about 70% homology with at least one receptor binding domain of a native ErbB ligand or with at least one ligand binding domain of a native ErbB receptor, and preferably, they will be at least about 80%, more preferably at least about 90% homologous with such receptor or ligand binding domains The amino acid sequence variants possess substitutions, deletions, and/or insertions at certain positions within the amino acid sequence of the native amino acid sequence "Homology" is defined as the percentage of residues in the amino acid sequence variant that are identical after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent homology Methods and computer programs for the alignment are well known in the art One such computer program is "Align 2", authored by Genentech, Inc , which was filed with user documentation in the United States Copyright Office, Washington, DC 20559, on December 10, 1991 The term "antibody" herein is used in the broadest sense and specifically covers intact monoclonal antibodies, polyclonal antibodies, multispecific antibodies (e g bispecific antibodies) formed from at least two intact antibodies, and antibody fragments, so long as they exhibit the desired biological 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 except for possible naturally occurring mutations that may be present in minor amounts Monoclonal antibodies are highly specific, being directed against a single antigenic site Furthermore, in contrast to polyclonal antibody preparations which include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen In addition to their specificity, the monoclonal antibodies are advantageous in that they may be synthesized uncontammated by other antibodies The modifier "monoclonal" indicates the character ofthe antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method For example, the monoclonal antibodies to be used in accordance with the present invention may be made by the hybπdoma method first described by Kohler et al , Nature, 256 495 (1975), or may be made by recombmant DNA methods (see, e g , U S Patent No 4,816,567) The ' monoclonal antibodies" may also be isolated from phage antibody libraries using the techniques described in Clackson et al , Nature, 352 624-628 (1991 ) and Marks etai , J Mol Bwl , 222 581-597 (1991), for example The monoclonal antibodies herein specifically include "chimeπc' antibodies in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chaιn(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (U S Patent No 4,816,567, and Morrison et al , Proc Natl Acad Sci USA, 81 6851-6855 (1984)) Chimeπc antibodies of interest herein include "pπmatized" antibodies comprising variable domain antigen-binding sequences derived from a non-human primate (e g Old World Monkey, Ape etc) and human constant region sequences "Antibody fragments" comprise a portion of an intact antibody, preferably comprising the antigen-binding or variable region thereof Examples of antibody fragments include Fab, Fab', F(ab') 2 , and Fv fragments, diabodies, linear antibodies, single-chain antibody molecules, and multispecific antibodies formed from antibody fragment(s) An "intact" antibody is one which comprises an antigen-binding variable region as well as a light chain constan' domain (C L ) and heavy chain constant domains, C H 1 , C fi and C H 3 The constant domains may be native sequence constant domains (e g human native sequence constant domains) or amino acid sequence variant thereof Preferably, the intact antibody has one or more effector functions Antibody "effector functions" refer to those biological activities attributable to the Fc region (a native sequence Fc region or amino acid sequence variant Fc region) of an antibody Examples of antibody effector functions include C 1 q binding, complement dependent cytotoxicit , Fc receptor binding, antibody-dependent cell mediated cytotoxicity (ADCC), phagocytosis, down regulation of cell surface receptors (e g B cell receptor, BCR), etc Depending on the amino acid sequence of the constant domain of their heavy chains, intact antibodies can be assigned to different "classes" There are five major classes of intact antibodies IgA, IgD, IgE, IgG, and IgM, and several of these may be further divided into "subclasses" (isotypes), e g , IgGl , IgG2, IgG3, IgG4, IgA, and IgA2 The heavy-chain constant domains that correspond to the different classes of antibodies are called α, δ, ε, γ, and μ, respectively The subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known "Antibody-dependent cell-mediated cytotoxicity" and "ADCC" refer to a cell-mediated reaction in which nonspecific cytotoxic cells that express Fc receptors (FcRs) (e g Natural Killer (NK) cells, neutrophils, and macrophages) recognize bound antibody on a target cell and subsequently cause lysis of the target cell The primary cells for mediating ADCC, NK cells, express FcγRIII only, whereas monocytes express FcγRI, FcγRII and FcγRIII FcR expression on hematopoietic cells in summarized is Table 3 on page 464 of Ravetch and Kinet, Annu Rev Immunol 9 457-92 ( 1991 ) To assess ADCC activity of a molecule of interest, an in vitro ADCC assay, such as that described in US Patent No 5,500,362 or 5,821 ,337 may be performed 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 m vivo, e g , in a animal model such as that disclosed in Clynes et ai PNAS (USA) 95 652-656 (1998) "Human effector cells" are leukocytes which express one or more FcRs and perform effector functions Preferably, the cells express at least FcγRIII and perform ADCC effector function Examples of human leukocytes which mediate ADCC include peripheral blood mononuclear cells (PBMC), natural killer (NK) cells, monocytes, cytotoxic T cells and neutrophils, with PBMCs and NK cells being preferred The effector cells may be isolated from a native source thereof, e g from blood or PBMCs as described herein The terms ' Fc receptor" or "FcR" are used to describe a receptor that binds to the Fc region of an antibody The preferred FcR is a native sequence human FcR Moreover, a preferred FcR is one which binds an IgG antibody (a gamma receptor) and includes receptors of the FcγRI, FcγRII, and Fcγ RIII subclasses, including allelic variants and alternatively spliced forms of these receptors FcγRII receptors include FcγRIIA (an ' activating receptor") and FcγRIIB (an "inhibiting receptor"), which have similar amino acid sequences that differ primarily in the cytoplasmic domains thereof Activating receptor FcγRIIA contains an immunoreceptor tyrosine-based activation motif (IT AM) in its cytoplasmic domain Inhibiting receptor FcγRIIB contains an immunoreceptor tyrosine-based inhibition motif (ITIM) in its cytoplasmic domain (see review M in Daeron, Annu Rev Immunol 15 203-234 (1997)) FcRs are reviewed in Ravetch and Kinet, Annu Rev Immunol 9 457-92 (1991 ), Capel et al lmmunomethods 4 25-34 ( 1994), and de Haas et ai , J Lab Clin Med 126 330-41 (1995) Other FcRs, including those to be identified in the future, are encompassed by the term "FcR" herein The te r m also includes the neonatal receptor, FcRn, which is responsible for the transfer of maternal IgGs to the fetus (Guyer et al , J Immunol 1 17 587 (1976) and Ki et al , J Immunol 24 249 (1994)) "Complement dependent cytotoxicity" or "CDC" refers to the ability of a molecule to lyse a target in the presence of complement The complement activation pathway is initiated by the binding of the first component of the complement system (Clq) to a molecule (e g an antibody) complexed with a cognate antigen To assess complement activation, a CDC assay, e g as described in Gazzano-Santoro et al , J Immunol Methods 202 163 ( 1996), may be performed "Native antibodies" are usually heterotetrameric glycoproteins of about 150,000 daltons, composed of two identical light (L) chains and two identical heavy (H) chains Each light chain is linked to a heavy chain by one covalent disulfide bond, while the number of disulfide linkages varies among the heavy chains of different immunoglobulin isotypes Each heavy and light chain also has regularly spaced intrachain disulfide bridges Each heavy chain has at one end a variable domain (V H ) followed by a number of constant domains Each light chain has a variable domain at one end (V L ) and a constant domain at its other end The constant domain of the light chain is aligned with the first constant domain of the heavy chain, and the light-chain variable domain is aligned with the variable domain of the heavy chain Particular amino acid residues are believed to form an interface between the light chain and heavy chain variable domains The term "variable ' refers to the fact that certain portions of the variable domains differ extensively in sequence among antibodies and are used in the binding and specificity of each particular antibody for its particular antigen However, the variability is not evenly distributed throughout the variable domains of antibodies It is concentrated in three segments called hypervanable regions both in the light chain and the heavy chain variable domains The more highly conserved portions of variable domains are called the framework regions (FRs) The variable domains of native heavy and light chains each comprise four FRs, largely adopting a β-sheet configuration, connected by three hypervanable regions, which form loops connecting, and in some cases forming part of the β- sheet structure The hypervanable regions in each chain are held together in close proximity by the FRs and, with the hypervanable regions from the other chain, contribute to the formation of the antigen-binding site of antibodies (see Kabat et al , Sequences of Proteins of Immunologtcal Interest, 5th Ed Public Health Service, National Institutes of Health, Bethesda, MD ( 1991 )) The constant domains are not involved directly in binding an antibody to an antigen, but exhibit various effector functions, such as participation of the antibody in antibody dependent cellular cytotoxicity (ADCC) The term "hypervanable region" when used herein refers to the amino acid residues of an antibody which are responsible for antigen-binding The hypervanable region generally comprises amino acid residues from a "complementarity determining region" or "CDR" (e g residues 24-34 (Ll), 50-56 (L2) and 89-97 (L3) in the light chain variable domain and 31-35 (HI ), 50-65 (H2) and 95-102 (H3) in the heavy chain variable domain, Kabat et al , Sequences of Proteins of Immunologtcal Interest, 5th Ed Public Health Service, National Institutes of Health, Bethesda, MD ( 1991 )) and/or those residues from a "hypervanable loop" (e g residues 26-32 (L 1 ), 50 52 (L2) and 91 -96 (L3) in the light chain variable domain and 26-32 (HI ), 53-55 (H2) and 96-101 (H3) in the heavy chain variable domain, Chothia and Lesk / Mol Bwl 196 901 -917 ( 1987)) "Framework Region' or "FR" residues are those variable domain residues other than the hypervanable region residues as herein defined Papam digestion of antibodies produces two identical antigen-binding fragments, called "Fab' fragments, each with a single antigen-bindmg site, and a residual "Fc" fragment, whose name reflects its ability to crystallize readily Pepsin treatment yields an F(ab') 2 fragment that has two antigen-binding sites and is still capable of cross- linking antigen "Fv" is the minimum antibody fragment which contains a complete antigen-recognition and antigen-binding site This region consists of a dimer of one heavy chain and one light chain variable domain in tight, non-covalent association It is in this configuration that the three hypervanable regions of each variable domain interact to define an antigen-binding site on the surface ofthe V H -V L dimer Collectively, the six hypervanable regions confer antigen- binding specificity to the antibody However, even a single variable domain (or half of an Fv comprising only three hypervanable regions specific for an antigen) has the ability to recognize and bind antigen, although at a lower affinity than the entire binding site The Fab fragment also contains the constant domain of the light chain and the first constant domain (CH 1 ) of the heavy chain Fab' fragments differ from Fab fragments by the addition of a few residues at the carboxy terminus ofthe heavy chain CHI domain including one or more cysteines from the antibody hinge region Fab'-SH is the designation herein for Fab' in which the cysteine resιdue(s) of the constant domains bear at least one free thiol group F(ab') 2 antibody fragments originally were produced as pairs of Fab' fragments which have hinge cysteines between them Other chemical couplings of antibody fragments are also known The "light chains" of antibodies from any vertebrate species can be assigned to one of two clearly distinct types, called kappa (K) and lambda (λ), based on the amino acid sequences of their constant domains "Single-chain Fv ' or "scFv" antibody fragments comprise the V H and V L domains of antibody, wherein these domains are present in a single polypeptide chain Preferably, the Fv polypeptide further comprises a polypeptide linker between the V H and V L domains which enables the scFv to form the desired structure for antigen binding For a review of scFv see Pluckthun in The Pharmacology of Monoclonal Antibodies, vol 1 13, Rosenburg and Moore eds , Springer- Verlag, New York, pp 269-315 (1994) Antι-ErbB2 antibody scFv fragments are described in W093/16185, U S Patent No 5,571 ,894, and U S Patent No 5,587,458 The term "diabodies" refers to small antibody fragments with two antigen-binding sites, which fragments comprise a variable heavy domain (V H ) connected to a variable light domain (V L ) in the same polypeptide chain (V H - V L ) By using a linker that is too short to allow pairing between the two domains on the same chain, the domains are forced to pair with the complementary domains ofanotherchain and create two antigen-binding sites Diabodies are described more fully in, for example, EP 404,097, WO 93/1 1 161 , and Holhnger et ai , Proc Natl Acad Set USA, 90 6444-6448 (1993) "Humanized" forms of non-human (e g , rodent) antibodies are chimeπc antibodies that contain minimal sequence derived from non-human immunoglobulin For the most part, humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a hypervanable region of the recipient are replaced by residues from a hypervanable region of a non-human species (donor antibody) such as mouse, rat, rabbit or nonhuman primate having the desired specificity, affinity, and capacity In some instances, framework region (FR) residues ofthe human immunoglobulin are replaced by corresponding non-human residues Furthermore, humanized antibodies may comprise residues that are not found in the recipient antibody or in the donor antibody These modifications are made to further refine antibody performance In general, the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the hypervanable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FRs are those of a human immunoglobulin sequence The humanized antibody optionally also will comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin For further details, see Jones etai , Nature 321 522-525 (1986), Riechmann etai , Nature 332 323-329 (1988), and Presta, Curr Op Struct Bwl 2 593-596 (1992) Humanized antι-ErbB2 antibodies include huMAb4D5-l , huMAb4D5-2, huMAb4D5-3, huMAb4D5-4, huMAb4D5-5, huMAb4D5-6, huMAb4D5-7 and huMAb4D5-8 (HERCEPTIN®) as described in Table 3 of U S Patent 5,821 ,337 expressly incorporated herein by reference, humanized 520C9 (W093/21319) and humanized 2C4 antibodies as described herembelow An "isolated" antibody is one which has been identified and separated and/or recovered from a component of its natural environment Contaminant components of its natural environment are materials which would interfere with diagnostic or therapeutic uses for the antibody, and may include enzymes, hormones, and other protemaceous or nonproteinaceous solutes In preferred embodiments, the antibody will be purified (1 ) to greater than 95% by weight of antibody as determined by the Lowry method, and most preferably more than 99% by weight, (2) to a degree sufficient to obtain at least 15 residues of N-terminal or internal amino acid sequence by use of a spinning cup sequenator, or (3) to homogeneity by SDS-PAGE under reducing or nonreducing conditions using Coomassie blue or, preferably, silver stain Isolated antibody includes the antibody in situ within recombinant cells since at least one component ofthe antibody's natural environment will not be present Ordinarily, however, isolated antibody will be prepared by at least one purification step An antibody "which binds" an antigen of interest, e g ErbB2 antigen, is one capable of binding that antigen with sufficient affinity such that the antibody is useful as a therapeutic agent in targeting a cell expressing the antigen Where the antibody is one which binds ErbB2, it will usually preferentially bind ErbB2 as opposed to other ErbB receptors, and may be one which does not significantly cross-react with other proteins such as EGFR, ErbB3 or ErbB4 In such embodiments, the extent of binding of the antibody to these non-ErbB2 proteins (e g , cell surface binding to endogenous receptor) will be less than 10% as determined by fluorescence activated cell sorting (FACS) analysis or radioimmunoprecipitation (RIA) Sometimes, the antι-ErbB2 antibody will not significantly cross-react with the rat neu protein, e g , as described in Schecter et al Nature 312 513 ( 1984) and Drebin et al , Nature 312 545-548 (1984) An antibody which "blocks" ligand activation of an ErbB receptor is one which reduces or prevents such activation as hereinabove defined, wherein the antibody is able to block ligand activation of the ErbB receptor substantially more effectively than monoclonal antibody 4D5, e g about as effectively as monoclonal antibodies 7F3 or 2C4 or Fab fragments thereof and preferably about as effectively as monoclonal antibody 2C4 or a Fab fragment thereof For example, the antibody that blocks ligand activation of an ErbB receptor may be one which is about 50- 100% more effective than 4D5 at blocking formation of an ErbB hetero-ohgomer Blocking of ligand activation of an ErbB receptor can occur by any means, e g by interfering with ligand binding to an ErbB receptor, ErbB complex formation, tyrosine kinase activity of an ErbB receptor in an ErbB complex and/or phosphorylation of tyrosine kinase resιdue(s) in or by an ErbB receptor Examples of antibodies which block ligand activation of an ErbB receptor include monoclonal antibodies 2C4 and 7F3 (which block HRG activation of ErbB2/ErbB3 and ErbB2/ErbB4 hetero-ohgomers, and EGF, TGF-α, amphireguhn, HB-EGF and/or epireguhn activation of an EGFR/ErbB2 hetero-ohgomer), and L26, L96 and L288 antibodies (Klapper et al Oncogene 14 2099-2109 ( 1997)), which block EGF and NDF binding to T47D cells which express EGFR, ErbB2, ErbB3 and ErbB4 An antibody having a "biological characteristic" of a designated antibody, such as the monoclonal antibody designated 2C4, is one which possesses one or more of the biological characteristics of that antibody which distinguish it from other antibodies that bind to the same antigen (e g ErbB2) For example, an antibody with a biological characteristic of 2C4 may block HRG activation of an ErbB hetero-ohgomer comprising ErbB2 and ErbB3 or ErbB4, block EGF, TGF-α, HB-EGF, epireguhn and/or amphiregulin activation of an ErbB receptor comprising EGFR and ErbB2, block EGF, TGF-α and/or HRG mediated activation of MAPK, and/or bind the same epitope in the extracellular domain of ErbB2 as that bound by 2C4 (e g which blocks binding of monoclonal antibody 2C4 to ErbB2) Unless indicated otherwise, the expression "monoclonal antibody 2C4" refers to an antibody that has antigen binding residues of, or derived from, the murine 2C4 antibody of the Examples below For example, the monoclonal antibody 2C4 may be murine monoclonal antibody 2C4 or a variant thereof, such as humanized antibody 2C4, possessing antigen binding amino acid residues of murine monoclonal antibody 2C4 Examples of humanized 2C4 antibodies are provided in Example 3 below Unless indicated otherwise, the expression "rhuMAb 2C4" when used herein refers to an antibody comprising the variable light (V L ) and variable heavy (V H ) sequences of SEQ ID Nos 3 and 4, respectively, fused to human light and heavy IgGl (non-A allotype) constant region sequences optionally expressed by a Chinese Hamster Ovary (CHO) cell Unless indicated otherwise, the term "monoclonal antibody 4D5" refers to an antibody that has antigen binding residues of, or derived from, the murine 4D5 antibody (ATCC CRL 10463) For example, the monoclonal antibody 4D5 may be murine monoclonal antibody 4D5 or a variant thereof, such as a humanized 4D5, possessing antigen binding residues of murine monoclonal antibody 4D5 Exemplary humanized 4D5 antibodies include huMAb4D5 1 , huMAb4D5-2, huMAb4D5-3, huMAb4D5-4, huMAb4D5-5, huMAb4D5-6, huMAb4D5-7 and huMAb4D5-8 (HERCEPTIN®) as in US Patent No 5,821,337, with huMAb4D5-8 (HERCEPTIN®) being a preferred humanized 4D5 antibody A "growth inhibitory agent" when used herein refers to a compound or composition which inhibits growth of a cell, especially an ErbB expressing cancer cell either in vitro or in vivo Thus, the growth inhibitory agent may be one which significantly reduces the percentage of ErbB expressing cells in S phase Examples of growth inhibitory agents include agents that block cell cycle progression (at a place other than S phase), such as agents that induce Gl arrest and M-phase arrest Classical M-phase blockers include the vincas (vincπstine and vinblastine), taxanes, and topo II inhibitors such as doxorubicin, epirubicin, daunorubicin, etoposide, and bleomycin Those agents that arrest Gl also spill over into S-phase arrest, for example, DNA alkylating agents such as tamoxifen, prednisone, dacarbazine, mechlorethamine, cisplatin, methotrexate, 5-fluorouracιl, and ara-C Further information can be found in The Molecular Basis of Cancer, Mendelsohn and Israel, eds , Chapter 1 , entitled "Cell cycle regulation, oncogenes, and antineoplastic drugs" by Murakami et al (WB Saunders Philadelphia, 1995), especially p 13 Examples of "growth inhibitory" antibodies are those which bind to ErbB2 and inhibit the growth of cancer cells overexpressing ErbB2 Preferred growth inhibitory antι-ErbB2 antibodies inhibit growth of SK-BR-3 breast tumor cells in cell culture by greater than 20%, and preferably greater than 50% (e g from about 50% to about 100%) at an antibody concentration of about 0 5 to 30 μg/ml, where the growth inhibition is determined six days after exposure of the SK-BR-3 cells to the antibody (see U S Patent No 5,677,171 issued October 14, 1997) The SK- BR-3 cell growth inhibition assay is described in more detail in that patent and hereinbelow The preferred growth inhibitory antibody is monoclonal antibody 4D5, e g , humanized 4D5 An antibody which "induces cell death" is one which causes a viable cell to become nonviable The cell is generally one which expresses the ErbB2 receptor, especially where the cell overexpresses the ErbB2 receptor Preferably, the cell is a cancer cell, e g a breast, ovarian, stomach, endometπal, salivary gland, lung, kidney, colon, thyroid, pancreatic or bladder cell In vitro, the cell may be a SK-BR-3, BT474, Calu 3, MDA-MB-453, MDA-MB- 361 or SKOV3 cell Cell death in vitro may be determined in the absence of complement and immune effector cells to distinguish cell death induced by antibody-dependent cell-mediated cytotoxicity (ADCC) or complement dependent cytotoxicity (CDC) Thus, the assay for cell death may be performed using heat inactivated serum (; e in the absence of complement) and in the absence of immune effector cells To determine whether the antibody is able to induce cell death, loss of membrane integrity as evaluated by uptake of propidium iodide (PI), trypan blue (see Moore et al Cytotechnology 17 1-11 (1995)) or 7AAD can be assessed relative to untreated cells Preferred cell death-inducing antibodies are those which induce PI uptake in the PI uptake assay in BT474 cells (see below) An antibody which "induces apoptosis" is one which induces programmed cell death as determined by binding of annexin V, fragmentation of DNA, cell shrinkage, dilation of endoplasmic reticulum, cell fragmentation, and/or formation of membrane vesicles (called apoptotic bodies) The cell is usually one which overexpresses the ErbB2 receptor Preferably the cell is a tumor cell, e g a breast, ovarian, stomach, endometπal, salivary gland, lung, kidney, colon, thyroid, pancreatic or bladder cell In vitro, the cell may be a SK-BR-3, BT474, Calu 3 cell, MDA- MB-453, MDA-MB-361 or SKOV3 cell Various methods are available for evaluating the cellular events associated with apoptosis For example, phosphatidyl seπne (PS) translocation can be measured by annexin binding, DNA fragmentation can be evaluated through DNA laddering, and nuclear/chromatin condensation along with DNA fragmentation can be evaluated by any increase in hypodiploid cells Preferably, the antibody which induces apoptosis is one which results in about 2 to 50 fold, preferably about 5 to 50 fold, and most preferably about 10 to 50 fold, induction of annexin binding relative to untreated cell in an annexin binding assay using BT474 cells (see below) Sometimes the pro-apoptotic antibody will be one which further blocks ErbB ligand activation of an ErbB receptor (e g 7F3 antibody), ; e the antibody shares a biological characteristic with monoclonal antibody 2C4 In other situations, the antibody is one which does not significantly block ErbB ligand activation of an ErbB receptor (e g 7C2) Further, the antibody may be one like 7C2 which, while inducing apoptosis, does not induce a large reduction in the percent of cells in S phase (e g one which only induces about 0-10% reduction in the percent of these cells relative to control) The "epitope 2C4" is the region in the extracellular domain of ErbB2 to which the antibody 2C4 binds In order to screen for antibodies which bind to the 2C4 epitope, a routine cross-blocking assay such as that described in Antibodies, A Laboratory Manual, Cold Spring Harbor Laboratory, Ed Harlow and David Lane (1988), can be performed Alternatively, epitope mapping can be performed to assess whether the antibody binds to the 2C4 epitope of ErbB2 (e g any one or more residues in the region from about residue 22 to about residue 584 of ErbB2, inclusive, see Figs 1A-B) The ' epitope 4D5" is the region in the extracellular domain of ErbB2 to which the antibody 4D5 (ATCC CRL 10463) binds This epitope is close to the transmembrane domain of ErbB2 To screen for antibodies which bind to the 4D5 epitope, a routine cross-blocking assay such as that described in Antibodies A Laboratory Manual, Cold Spring Harbor Laboratory, Ed Harlow and David Lane (1988), can be performed Alternatively, epitope mapping can be performed to assess whether the antibody binds to the 4D5 epitope of ErbB2 (e g any one or more residues in the region from about residue 529 to about residue 625, inclusive, see Figs 1 A-B) The "epitope 3H4" is the region in the extracellular domain of ErbB2 to which the antibody 3H4 binds This epitope includes residues from about 541 to about 599, inclusive, in the amino acid sequence of ErbB2 extracellular domain, see Figs 1 A-B The "epitope 7C2/7F3" is the region at the N terminus of the extracellular domain of ErbB2 to which the 7C2 and/or 7F3 antibodies (each deposited with the ATCC, see below) bind To screen for antibodies which bind to the 7C2/7F3 epitope, a routine cross-blocking assay such as that described in Antibodies, A Laboratory Manual, Cold Spring Harbor Laboratory, Ed Harlow and David Lane (1988), can be performed Alternatively, epitope mapping can be performed to establish whether the antibody binds to the 7C2/7F3 epitope on ErbB2 (e g any one or more of residues in the region from about residue 22 to about residue 53 of ErbB2, see Figs 1A-B) "Treatment" refers to both therapeutic treatment and prophylactic or preventative measures Those in need of treatment include those already with the disorder as well as those in which the disorder is to be prevented Hence, the mammal to be treated herein may have been diagnosed as having the disorder or may be predisposed or susceptible to the disorder "Mammal" for purposes of treatment refers to any animal classified as a mammal, including humans, domestic and farm animals, and zoo, sports, or pet animals, such as dogs, horses, cats, cows, etc Preferably, the mammal is human A "disorder" is any condition that would benefit from treatment with the antι-ErbB2 antibody This includes chronic and acute disorders or diseases including those pathological conditions which predispose the mammal to the disorder in question Non-limiting examples of disorders to be treated herein include benign and malignant tumors, leukemias and lymphoid malignancies, neuronal, glial, astrocytal, hypothalamic and other glandular, macrophagal, epithelial, stromal and blastocoehc disorders, and inflammatory, angiogenic and immunologic disorders The term "therapeutically effective amount" refers to an amount of a drug effective to treat a disease or disorder in a mammal In the case of cancer, the therapeutically effective amount ofthe drug may reduce the number of cancer cells, reduce the tumor size, inhibit (; e , slow to some extent and preferably stop) cancer cell infiltration into peripheral organs, inhibit (J e , slow to some extent and preferably stop) tumor metastasis, inhibit, to some extent, tumor growth, and/or relieve to some extent one or more of the symptoms associated with the cancer To the extent the drug may prevent growth and/or kill existing cancer cells, it may be cytostatic and/or cytotoxic For cancer therapy, efficacy can, for example, be measured by assessing the time to disease progression (TTP) and/or determining the response rate (RR) The terms "cancer" and "cancerous" refer to or describe the physiological condition in mammals that is typically characterized by unregulated cell growth Examples of cancer include, but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia or lymphoid malignancies More particular examples of such cancers include squamous cell cancer (e g epithelial squamous cell cancer), lung cancer including small-cell lung cancer, non-small cell lung cancer, adenocarπnoma of the lung and squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, ghoblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, rectal cancer, colorectal cancer, endometπal or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma, anal carcinoma, penile carcinoma, as well as head and neck cancer An "ErbB-expressing cancer" is one comprising cells which have ErbB protein present at their cell surface An "ErbB2-expressιng cancer" is one which produces sufficient levels of ErbB2 at the surface of cells thereof, such that an antι-ErbB2 antibody can bind thereto and have a therapeutic effect with respect to the cancer A cancer "characterized by excessive activation" of an ErbB receptor is one in which the extent of ErbB receptor activation in cancer cells significantly exceeds the level of activation of that receptor in non-cancerous cells of the same tissue type Such excessive activation may result from overexpression of the ErbB receptor and/or greater than normal levels of an ErbB ligand available for activating the ErbB receptor in the cancer cells Such excessive activation may cause and/or be caused by the malignant state of a cancer cell In some embodiments, the cancer will be subjected to a diagnostic or prognostic assay to determine whether amplification and/or overexpression of an ErbB receptor is occurring which results in such excessive activation of the ErbB receptor Alternatively, or additionally, the cancer may be subjected to a diagnostic or prognostic assay to determine whether amplification and/or overexpression an ErbB ligand is occurring in the cancer which attributes to excessive activation of the receptor In a subset of such cancers, excessive activation of the receptor may result from an autocnne stimulatory pathway In an "autocnne" stimulatory pathway, self stimulation occurs by virtue of the cancer cell producing both an ErbB ligand and its cognate ErbB receptor For example, the cancer may express or overexpress EGFR and also express or overexpress an EGFR ligand (e g EGF, TGF-α, or HB-EGF) In another embodiment, the cancer may express or overexpress ErbB2 and also express or overexpress a heregulin (e g γ-HRG) A cancer which "overexpresses" an ErbB receptor is one which has significantly higher levels of an ErbB receptor, such as ErbB2, at the cell surface thereof, compared to a noncancerous cell of the same tissue type Such overexpression may be caused by gene amplification or by increased transcription or translation ErbB receptor overexpression may be determined in a diagnostic or prognostic assay by evaluating increased levels of the ErbB protein present on the surface of a cell (e g via an immunohistochemistry assay, IHC) Alternatively, or additionally, one may measure levels of ErbB-encoding nucleic acid in the cell, e g via fluorescent in situ hybridization (FISH, see W098/45479 published October, 1998 ), southern blotting, or polymerase chain reaction (PCR) techniques, such as real time quantitative PCR (RT-PCR) One may also study ErbB receptor overexpression by measuring shed antigen (e g , ErbB extracellular domain) in a biological fluid such as serum (see, e g , U S Patent No 4,933,294 issued June 12, 1990, WO91/05264 published April 18, 1991 , U S Patent 5,401 ,638 issued March 28, 1995, and Sias et al J Immunol Methods 132 73-80 (1990)) Aside from the above assays, various in vivo assays are available to the skilled practitioner For example, one may expose cells within the body ofthe patient to an antibody which is optionally labeled with a detectable label, e g a radioactive isotope, and binding of the antibody to cells in the patient can be evaluated, e g by external scanning for radioactivity or by analyzing a biopsy taken from a patient previously exposed to the antibody Conversely, a cancer which is "not characterized by overexpression of the ErbB2 leceptor" is one which, in a diagnostic assay, does not express higher than normal levels of ErbB2 receptor compared to a noncancerous cell of the same tissue type A cancer which "overexpresses" an ErbB ligand is one which produces significantly higher levels of that ligand compared to a noncancerous cell of the same tissue type Such overexpression may be caused by gene amplification or by increased transcription or translation Overexpression of the ErbB ligand may be determined diagnostically by evaluating levels of the ligand (or nucleic acid encoding it) in the patient, e g in a tumor biopsy or by various diagnostic assays such as the IHC, FISH, southern blotting, PCR or in vivo assays described above A "hormone independent" cancer is one in which proliferation thereof is not dependent on the presence of a hormone which binds to a receptor expressed by cells in the cancer Such cancers do not undergo clinical regression upon administration of pharmacological or surgical strategies that reduce the hormone concentration in or near the tumor Examples of hormone independent cancers include androgen independent prostate cancer, estrogen independent breast cancer, endometnal cancer and ovarian cancer. Such cancers may begin as hormone dependent tumors and progress from a hormone-sensitive stage to a hormone-refractory tumor following anti- hormonal therapy The term "cytotoxic agent" as used herein refers to a substance that inhibits or prevents the function of cells 21 1 131 125 90 and/or causes destruction of cells The term is intended to include radioactive isotopes (e g At , 1 , 1 , Y , Re and radioactive isotopes of Lu), chemotherapeutιc agents, and toxins such as small molecule toxins or enzymatically active toxins of bacterial, fungal, plant or animal origin, including fragments and/or variants thereof A "chemotherapeutic agent" is a chemical compound useful in the treatment of cancer Examples of chemotherapeutic agents include alkylating agents such as thiotepa and cyclosphosphamide (CYTOXAN™), alkyl sulfonates such as busulfan, improsulfan and piposulfan, aziπdines such as benzodopa, carboquone, meturedopa, and uredopa, ethylemmines and methylamelamines including altretamine, tπethylenemelamine, trietylenephosphoramide, triethylenethiophosphaoramide and tπmethylolomelamine, nitrogen mustards such as chlorambucil, chlornaphazine, cholophosphamide, estramustine, lfosfamide, mechlorethamine, mechlorethamine oxide hydrochloπde, melphalan, novembichin, phenestenne, prednimustine, trofosfamide, uracil mustard, nitrosureas such as carmustine, chlorozotocin, fotemustine, lomustine, mmustine, ranimustine, antibiotics such as aclacinomysins, actinomycin, authramycin, azaseπne, bleomycins, cactinomycin, cahcheamicin, carabicin, carminomycin, carzinophilm, chromomycins, dactinomycin, daunorubicin, detorubicin, 6-dιazo-5-oxo-L-norleucιne, doxorubicin, epirubicin, esorubicin, idarubicin, marcellomycin, mitomycins, mycophenohc acid, nogalamycin, ohvomycins, peplomycin, potfiromycin, puromycin, quelamycin, rodorubicin, streptonigπn, streptozocin, tubercidin, ube mex, zinostatin, zorubicin, anti-metabolites such as methotrexate and 5-fluorouracιl (5-FU), folic acid analogues such as denoptenn, methotrexate, pteroptenn, tπmetrexate, puπne analogs such as fludarabme, 6- mercaptopuπne, thiamipnne, thioguanine, pynmidine analogs such as ancitabine, azacitidine, 6-azauπdιne, carmofur, cytarabine, dideoxyundine, doxiflundine, enocitabine, floxuπdine, 5-FU, androgens such as calusterone, dromostanolone propionate, epitiostanol, mepitiostane, testolactone, anti-adrenals such as aminoglutethimide, mitotane, tπlostane, folic acid replenisher such as frohnic acid, aceglatone, aldophosphamide glycoside, aminolevuhnic acid, amsacπne, bestrabucil, bisantrene, edatraxate, defofamine, demecolcine, diaziquone, elfornithine, elhptinium acetate, etoglucid, gallium nitrate, hydroxyurea, lentinan, lonidamine, mitoguazone, mitoxantrone, mopidamol, nitracnne, pentostatin, phenamet, pirarubicin, podophylhnic acid, 2-ethylhydrazιde, procarbazme, PSK®, razoxane, sizofiran, spirogermanium, tenuazonic acid, tnaziquone, 2, 2', 2"- tnchlorotπethylamine, urethan, v desine, dacarbazine, annomustine, mitobronitol, mitolactol, pipobroman, gacytosine. arabinoside ("Ara-C"), cyclophosphamide, thiotepa, taxanes, e g pachtaxel (TAXOL ® , Bristol-Myers Squibb Oncology, Princeton, NJ) and docetaxel (TAXOTERE®, Rhόne-Poulenc Rorer, Antony, France), chlorambucil, gemcitabine, 6-thιoguanιne, mercaptopunne, methotrexate, platinum analogs such as cisplatin and carboplatin, vinblastine, platinum, etoposide (VP-16), lfosfamide, mitomycin C, mitoxantrone, vincπstine, vinorelbine, navelbine, novantrone, teniposide, daunomycin, aminopteπn, xeloda, ibandronate, CPT-1 1 , topoisomerase inhibitor RFS 2000, difluoromethylornithine (DMFO), retinoic acid, esperamicins, capecitabine, and pharmaceutically acceptable salts, acids or derivatives of any ofthe above Also included in this definition are anti- hormonal agents that act to regulate or inhibit hormone action on tumors such as anti-estrogens including for example tamoxifen, raloxifene, aromatase inhibiting 4(5)-ιmιdazoles, 4-hydroxytamoxιfen, tπoxifene, keoxifene, LY1 17018, onapπstone, and toremifene (Fareston), and anti-androgens such as flutamide, nilutamide, bicalutamide, leupro de, and goserehn, and pharmaceutically acceptable salts, acids or derivatives of any of the above As used herein, the term "EGFR-targeted drug" refers to a therapeutic agent that binds to EGFR and, optionally, inhibits EGFR activation Examples of such agents include antibodies and small molecules that bind to EGFR Examples of antibodies which bind to EGFR include MAb 579 (ATCC CRL HB 8506), MAb 455 (ATCC CRL HB8507), MAb 225 (ATCC CRL 8508), MAb 528 (ATCC CRL 8509) (see, US Patent No 4,943, 533, Mendelsohn et al ) and variants thereof, such as chimeπzed 225 (C225) and reshaped human 225 (H225) (see, WO 96/40210, Imclone Systems Inc ), antibodies that bind type II mutant EGFR (US Patent No 5,212,290), humanized and chimeπc antibodies that bind EGFR as described in US Patent No 5,891 ,996, and human antibodies that bind EGFR (see WO98/50433, Abgenix) The anti-EGFR antibody may be conjugated with a cyotoxic agent, thus generating an lmmunoconjugate (see, e g , EP659,439A2, Merck Patent GmbH) Examples of small molecules that bind to EGFR include ZD1839 (Astra Zeneca), CP-358774 (OSI/Pfizer) and AG1478 An "anti-angiogenic agent" refers to a compound which blocks, or interferes with to some degree, the development of blood vessels The anti-angiogenic factor may, for instance, be a small molecule or antibody that binds to a growth factor or growth factor receptor involved in promoting angiogenesis The preferred anti- angiogenic factor herein is an antibody that binds to Vascular Endothelial Growth Factor (VEGF) The term "cytokine" is a generic term for proteins released by one cell population which act on another cell as intercellular mediators Examples of such cytokines are lymphokines, monokines, and traditional polypeptide hormones Included among the cytokines are growth hormone such as human growth hormone, N-methionyl human growth hormone, and bovine growth hormone, parathyroid hormone, thyroxine, insulin, proinsuhn, relaxin, prorelaxin, glycoprotein hormones such as follicle stimulating hormone (FSH), thyroid stimulating hormone (TSH), and luteimzing hormone (LH), hepatic growth factor, fibroblast growth factor, prolactin, placental lactogen, tumor necrosis factor-α and -β, mullenan-inhibiting substance, mouse gonadotropin-associated peptide, inhibin, activin, vascular endothelial growth factor, lntegnn, thrombopoietin (TPO), nerve growth factors such as NGF-β, platelet- growth factor, transforming growth factors (TGFs) such as TGF-α and TGF-β, msuhn-like growth factor-I and -II, erythropoietin (EPO), osteomductive factors, interferons such as interferon-α, -β, and -γ, colony stimulating factors (CSFs) such as macrophage-CSF (M-CSF), granulocyte-macrophage-CSF (GM-CSF), and granulocyte-CSF (G- CSF), interleukins (ILs) such as IL-1 , IL-lα, IL-2, IL-3, IL-4, IL-5, IL-6, IL-7, IL-8, IL-9, IL-10, IL-1 1 , IL-12, a tumor necrosis factor such as TNF-α or TNF-β, and other polypeptide factors including LIF and kit ligand (KL) As used herein, the term cytokine includes proteins from natural sources or from recombinant cell culture and biologically active equivalents of the native sequence cytokines The term "prodrug" as used in this application refers to a precursor or derivative form of a pharmaceutically active substance that is less cytotoxic to tumor cells compared to the parent drug and is capable of being enzymatically activated or converted into the more active parent form See, e g , Wilman, "Prodrugs in Cancer Chemotherapy" Biochemical Society Transactions, 14, pp 375-382, 615th Meeting Belfast (1986) and Stella etai , "Prodrugs A Chemical Approach to Targeted Drug Delivery," Directed Drug Delivery, Borchardt et ai , (ed ), pp 247-267, Humana Press ( 1985) The prodrugs of this invention include, but are not limited to, phosphate-containing prodrugs, thiophosphate-containing prodrugs, sulfate-containing prodrugs, peptide-containing prodrugs, D-amino acid-modified prodrugs, glycosylated prodrugs, β-lactam-containing prodrugs, optionally substituted phenoxyacetamide-contaimng prodrugs or optionally substituted phenylacetamide-containmg prodrugs, 5- fluorocytosine and other 5-fluorouπdιne prodrugs which can be converted into the more active cytotoxic free drug Examples of cytotoxic drugs that can be deπvatized into aprodrug form for use in this invention include, but are not limited to, those chemotherapeutic agents described above A "hposome" is a small vesicle composed of various types of lipids, phosphohpids and/or surfactant which is useful for delivery of a drug (such as the antι-ErbB2 antibodies disclosed herein and, optionally, a chemotherapeutic agent) to a mammal The components of the hposome are commonly arranged in a bilayer formation, similar to the hpid arrangement of biological membranes 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, contraindications and/or warnings concerning the use of such therapeutic products A "cardioprotectant" is a compound or composition which prevents or reduces myocardial dysfunction (( e cardiomyopathy and/or congestive heart failure) associated with administration of a drug, such as an anthracychne antibiotic and/or an antι-ErbB2 antibody, to a patient The cardioprotectant may, for example, block or reduce a free- radical-mediated cardiotoxic effect and/or prevent or reduce oxidative-stress injury Examples of cardioprotectants encompassed by the present definition include the iron-chelating agent dexrazoxane (ICRF-187) (Seifert et ai The Annals of Pharmacotherap^ 28 1063-1072 (1994)), a lipid-loweπng agent and/or anti-oxidant such as probucol (S gal et al J Mol Cell Cardwl 27 1055-1063 ( 1995)), amifostine (aminothiol 2-[(3- amιnopropyl)amιno]ethanethιol-dιhydrogen phosphate ester, also called WR-2721 , and the dephosphorylated cellular uptake form thereof called WR-1065) and S-3-(3-methylamιnopropylamιno)propylphosphorothιoιc acid (WR- 151327), see Green et ai Cancer Research 54 738-741 (1994), digoxin (Bπstow, M R In Bπstow MR, ed Drug- Induced Heart Disease New York Elsevier 191-215 (1980)), beta-blockers such as metoprolol (Hjalmarson et ai Drugs 47 Suppl 4 31-9 (1994), and Shaddy ef α/ Am Heart J 129 197-9 (1995)), vitamin E, ascorbic acid (vitamin C), free radical scavengers such as oleanohc acid, ursohc acid and N-acetylcysteine (NAC), spin trapping compounds such as alpha-phenyl-tert-butyl nitrone (PBN), (Paracchini et al , Anticancer Res 13 1607-1612 (1993)), selenoorganic compounds such as P251 (Elbesen), and the like An "isolated" nucleic acid molecule is a nucleic acid molecule that is identified and separated from at least one contaminant nucleic acid molecule with which it is ordinarily associated in the natural source of the antibody nucleic acid An isolated nucleic acid molecule is other than in the form or setting in which it is found in nature Isolated nucleic acid molecules therefore are distinguished from the nucleic acid molecule as it exists in natural cells However, an isolated nucleic acid molecule includes a nucleic acid molecule contained in cells that ordinarily express the antibody where, for example, the nucleic acid molecule is in a chromosomal location different from that of natural cells The expression "control sequences" refers to DNA sequences necessary for the expression of an operably linked coding sequence in a particular host organism The control sequences that are suitable for prokaryotes, for example, include a promoter, optionally an operator sequence, and a nbosome binding site Eukaryotic cells are known to utilize promoters, polyadenylation signals, and enhancers Nucleic acid is "operably linked" when it is placed into a functional relationship with another nucleic acid sequence For example, DNA for a presequence or secretory leader is operably linked to DNA for a polypeptide if it is expressed as a preprotein that participates in the secretion ofthe polypeptide, a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the sequence, or a πbosome binding site is operably linked to a coding sequence if it is positioned so as to facilitate translation Generally, ' operably linked" means that the DNA sequences being linked are contiguous, and, in the case of a secretory leader, contiguous and in reading phase However, enhancers do not have to be contiguous Linking is accomplished by hgation at convenient restriction sites If such sites do not exist, the synthetic ohgonucleotide adaptors or linkers are used in accordance with conventional practice As used herein, the expressions "cell," "cell line," and "cell culture" are used interchangeably and all such designations include progeny Thus, the words "transformants" and "transformed cells" include the primary subject cell and cultures derived therefrom without regard for the number of transfers It is also understood that all progeny may not be precisely identical in DNA content, due to deliberate or inadvertent mutations Mutant progeny that have the same function or biological activity as screened for in the originally transformed cell are included Where distinct designations are intended, it will be clear from the context II. Production of anti-ErbB2 Antibodies A description follows as to exemplary techniques for the production of the antibodies used in accordance with the present invention The ErbB2 antigen to be used for production of antibodies may be, e g , a soluble form of the extracellular domain of ErbB2 or a portion thereof, containing the desired epitope Alternatively, cells expressing ErbB2 at their cell surface (e g NIH-3T3 cells transformed to overexpress ErbB2, or a carcinoma cell line such as SK-BR-3 cells, see Stancovski et al PNAS (USA) 88 8691-8695 (1991 )) can be used to generate antibodies Other forms of ErbB2 useful for generating antibodies will be apparent to those skilled in the art (i) Polyclonal antibodies Polyclonal antibodies are preferably raised in animals by multiple subcutaneous (sc) or lntrapeπtoneal ( ) injections ofthe relevant antigen and an adjuvant It may be useful to conjugate the relevant antigen to a protein that is lmmunogenic in the species to be immunized, e g , keyhole limpet hemocyanin, serum albumin, bovine thyroglobuhn, or soybean trypsin inhibitor using a bifunctional or den vatizing agent, for example, maleimidobenzoyl sulfosuccinimide ester (conjugation through cysteine residues), N-hydroxysuccinimide (through lysine residues), glutaraldehyde, succinic anhydride, SOCl 2 , or R N=C=NR, where R and P are diflerent alkyl groups Animals are immunized against the antigen, lmmunogenic conjugates, or derivatives by combining, e g , 100 μg or 5 μg of the protein or conjugate (for rabbits or mice, respectively) with 3 volumes of Freund's complete adjuvant and injecting the solution intradermally at multiple sites One month later the animals are boosted with 1/5 to 1/10 the original amount of peptide or conjugate in Freund's complete adjuvant by subcutaneous injection at multiple sites Seven to 14 days later the animals are bled and the serum is assayed for antibody titer Animals are boosted until the titer plateaus Preferably, the animal is boosted with the conjugate of the same antigen, but conjugated to a different protein and/or through a different cross-linking reagent Conjugates also can be made in recombinant cell culture as protein fusions Also, aggregating agents such as alum are suitably used to enhance the immune response (it) Monoclonal antibodies Monoclonal antibodies are obtained from a population of substantially homogeneous antibodies, i e , the individual antibodies comprising the population are identical except for possible naturally occurring mutations that may be present in minor amounts Thus, the modifier "monoclonal" indicates the character of the antibody as not being a mixture of discrete antibodies For example, the monoclonal antibodies may be made using the hybndoma method first described by Kohler et al , Nature, 256 495 (1975), or may be made by recombinant DNA methods (U S Patent No 4,816,567) In the hybndoma method, a mouse or other appropriate host animal, such as a hamster, is immunized as hereinabove described to elicit lymphocytes that produce or are capable of producing antibodies that will specifically bind to the protein used for immunization Alternatively, lymphocytes may be immunized in vitro Lymphocytes then are fused with myeloma cells using a suitable fusing agent, such as polyethylene glycol, to form a hybndoma cell (Goding, Monoclonal Antibodies Principles and Practice, pp 59-103 (Academic Press, 1986)) The hybndoma cells thus prepared are seeded and grown in a suitable culture medium that preferably contains one or more substances that inhibit the growth or survival of the unfused, parental myeloma cells For example, if the parental myeloma cells lack the enzyme hypoxanthine guanine phosphoπbosyl transferase (HGPRT or HPRT), the culture medium for the hybπdomas typically will include hypoxanthine, aminoptenn, and thymidine (HAT medium), which substances prevent the growth of HGPRT-deficient cells Preferred myeloma cells are those that fuse efficiently, support stable high level production of antibody by the selected antibody-producing cells, and are sensitive to a medium such as HAT medium Among these, preferred myeloma cell lines are murine myeloma lines, such as those derived from MOPC 21 and MPC-1 1 mouse tumors available from the Salk Institute Cell Distribution Center, San Diego, California USA, and SP-2 or X63-Ag8- 653 cells available from the American Type Culture Collection, Rockville, Maryland USA Human myeloma and mouse-human heteromyeloma cell lines also have been described for the production of human monoclonal antibodies (Kozbor.y Immunol , 133 3001 ( 1984), and Bxodtur et al , Monoclonal Antibody Production Techniques and Applications, pp 51-63 (Marcel Dekker, Inc , New York, 1987)) Culture medium in which hybndoma cells are growing is assayed for production of monoclonal antibodies directed against the antigen Preferably, the binding specificity of monoclonal antibodies produced by hybndoma cells is determined by immunoprecipitation or by an in vitro binding assay, such as radioimmunoassay (RIA) or enzyme-linked immunoabsorbent assay (ELISA) The binding affinity ofthe monoclonal antibody can, for example, be determined by the Scatchard analysis of Munson et al , Anal Biochem , 107 220 ( 1980) After hybndoma cells are identified that produce antibodies of the desired specificity, affinity, and/or activity, the clones may be subcloned by limiting dilution procedures and grown by standard methods (Goding, Monoclonal Antibodies Principles and Practice, pp 59-103 (Academic Press, 1986)) Suitable culture media for this purpose include, for example, D-MEM or RPMI- 1640 medium In addition, the hybndoma cells may be grown in vivo as ascites tumors in an animal The monoclonal antibodies secreted by the subclones are suitably separated from the culture medium, ascites fluid, or serum by conventional antibody purification procedures such as, for example, protein A-Sepharose, hydroxylapatite chromatography, gel electrophoresis, dialysis, or affinity chromatography DNA encoding the monoclonal antibodies is readily isolated and sequenced using conventional procedures (e g , by using oligonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains of murine antibodies) The hybndoma cells serve as a preferred source of such DNA Once isolated, the DNA may be placed into expression vectors, which are then transfected into host cells such as E coli cells, simian COS cells, Chinese Hamster Ovary (CHO) cells, or myeloma cells that do not otherwise produce antibody protein, to obtain the synthesis of monoclonal antibodies in the recombinant host cells Review articles on recombinant expression in bacteria of DNA encoding the antibody include Skerra et al , Curr Opinion in Immunol , 5 256-262 (1993) and Pluckthun, Immunol Revs , 130 151-188 (1992) In a further embodiment, monoclonal antibodies or antibody fragments can be isolated from antibody phage libraries generated using the techniques described in McCafferty et al , Nature, 348 552-554 (1990) Clackson et al , Nature, 352.624-628 ( 1991) and Marks et al , J Mol Bwl , 222 581-597 (1991 ) describe the isolation of murine and human antibodies, respectively, using phage libraries Subsequent publications describe the production of high affinity (nM range) human antibodies by chain shuffling (Marks et ai , Bio/Technology, 10 779- 783 (1992)), as well as combinatorial infection and in vivo recombination as a strategy for constructing very large phage libraries (Waterhouse et al , Nuc Acids Res , 21 2265-2266 (1993)) Thus, these techniques are viable alternatives to traditional monoclonal antibody hybndoma techniques for isolation of monoclonal antibodies The DNA also may be modified, for example, by substituting the coding sequence for human heavy chain and light chain constant domains in place of the homologous muπne sequences (U S Patent No 4,816,567, and Morrison, etai , Proc NatlAcad Sci USA, & \ 6851 ( 1984)), or by covalently joining to the immunoglobulin coding sequence all or part of the coding sequence for a non-immunoglobuhn polypeptide Typically such non-immunoglobuhn polypeptides are substituted for the constant domains of an antibody, or they are substituted for the variable domains of one antigen-combining site of an antibody to create a chimeπc bivalent antibody comprising one antigen-combining site having specificity for an antigen and another antigen- combining site having specificity for a different antigen (in) Humanized antibodies Methods for humanizing non-human antibodies have been described in the art Preferably, a humanized antibody has one or more amino acid residues introduced into it from a source which is non-human These non- human amino acid residues are often referred to as "import" residues, which are typically taken from an "import" variable domain Humanization can be essentially performed following the method of Winter an'! co-workers (Jones et al, Nature, 321 522-525 ( 1986), Riechmann et al , Nature, 332.323-327 ( 1988), Verhoeyen et al , Science, 239 1534- 1536 ( 1988)), by substituting hypervanable region sequences for the corresponding sequences of a human antibody Accordingly, such "humanized" antibodies are chimeπc antibodies (U.S Patent No 4,816,567 ) wherein substantially less than an intact human variable domain has been substituted by the corresponding sequence from a non-human species In practice, humanized antibodies are typically human antibodies in which some hypervanable region residues and possibly some FR residues are substituted by residues from analogous sites in rodent antibodies The choice of human variable domains, both light and heavy, to be used in making the humanized antibodies is very important to reduce antigenicity. According to the so-called "best-fit" method, the sequence of the variable domain of a rodent antibody is screened against the entire library of known human variable-domain sequences The human sequence which is closest to that of the rodent is then accepted as the human framework region (FR) for the humanized antibody (Sims et al, J Immunol , 151 2296 (1993), Chothia ef al , J. Mol Bwl , 196 901 (1987)) Another method uses a particular framework region derived from the consensus sequence of all human antibodies of a particular subgroup of light or heavy chains The same framework may be used for several different humanized antibodies (Carter et al , Proc Natl Acad Set USA, 89 4285 (1992), Presta ef al , J Immunol , 151 2623 (1993)) It is further important that antibodies be humanized with retention of high affinity for the antigen and other favorable biological properties To achieve this goal, according to a preferred method, humanized antibodies are prepared by a process of analysis ofthe parental sequences and various conceptual humanized products using three- dimensional models of the parental and humanized sequences Three-dimensional immunoglobulin models are commonly available and are familiar to those skilled in the art Computer programs are available which illustrate and display probable three-dimensional conformational structures of selected candidate immunoglobulin sequences Inspection of these displays permits analysis of the likely role of the residues in the functioning of the candidate immunoglobulin sequence, i e , the analysis of residues that influence the ability of the candidate immunoglobulin to bind its antigen In this way, FR residues can be selected and combined from the recipient and import sequences so that the desired antibody characteristic, such as increased affinity for the target antιgen(s), is achieved In general, the hypervanable region residues are directly and most substantially involved in influencing antigen binding Example 3 below describes production of exemplary humanized antι-ErbB2 antibodies which bιnd ErbB2 and block ligand activation of an ErbB receptor The humanized antibody of particular interest herein blocks EGF, TGF-α and/or HRG mediated activation of MAPK essentially as effectively as murine monoclonal antibody 2C4 (or a Fab fragment thereof) and/or binds ErbB2 essentially as effectively as murine monoclonal antibody 2C4 (or a Fab fragment thereof) The humanized antibody herein may, for example, comprise nonhuman hypervanable region residues incorporated into a human variable heavy domain and may further comprise a framework region (FR) substitution at a position selected from the group consisting of 69H, 71H and 73H utilizing the variable domain numbering system set forth in Kabat et al , Sequences of Proteins of Immunologtcal Interest, 5th Ed Public Health Service, National Institutes of Health, Bethesda, MD ( 1991 ) In one embodiment, the humanized antibody comprises FR substitutions at two or all of positions 69H, 71H and 73H An exemplary humanized antibody of interest herein comprises variable heavy domain complementarity determining residues GFTFTDYTMX, where X is preferrably D or 3 (SEQ ID NO 7), DVNPNSGGSIYNQRFKG (SEQ ID NO 8), and/or NLGPSFYFDY (SEQ ID NO 9), optionally comprising ammo acid modifications of those CDR residues, e g where the modifications essentially maintain or improve affinity of the antibody For example, the antibody variant of interest may have from about one to about seven or about five amino acid substitutions in the above variable heavy CDR sequences Such antibody variants may be prepared by affinity maturation, e g , as described below The most preferred humanized antibody comprises the variable heavy domain amino acid sequence in SEQ ID NO 4 The humanized antibody may comprise variable light domain complementarity determining residues KASQDVSIGVA (SEQ ID NO 10), SASYX^X 3 , where X 1 is preferably R or L, X 2 is preferably Y or E, and X 3 is preferably T or S (SEQ ID NO 1 1 ), and/or QQYYIYPYT (SEQ ID NO 12), e g in addition to those variable heavy domain CDR residues in the preceding paragraph Such humanized antibodies optionally comprise amino acid modifications ofthe above CDR residues, e g where the modifications essentially maintain or improve affinity of the antibody For example, the antibody variant of interest may have from about one to about seven or about five amino acid substitutions in the above variable light CDR sequences Such antibody variants may be prepared by affinity maturation, e g , as described below The most preferred humanized antibody comprises the variable light domain amino acid sequence in SEQ ID NO 3 The present application also contemplates affinity matured antibodies which bind ErbB2 and block ligand activation of an ErbB receptor The parent antibody may be a human antibody or a humanized antibody, e g , one comprising the variable light and/or heavy sequences of SEQ ID Nos 3 and 4, respectively (t e variant 574) The affinity matured antibody preferably binds to ErbB2 receptor with an affinity superior to that of muπne 2C4 or variant 574 (e g from about two or about four fold, to about 100 fold or about 1000 fold improved affinity, e g as assessed using a ErbB2-extracellular domain (ECD) ELISA) Exemplary variable heavy CDR residues for substitution include H28, H30, H34, H35, H64, H96, H99, or combinations of two or more (e g two, three, four, five, six, or seven of these residues) Examples of variable light CDR residues for alteration include L28, L50, L53, L56, L91, L92, L93, L94, L96, L97 or combinations of two or more (e g two to three, four, five or up to about ten of these residues) Various forms ofthe humanized antibody or affinity matured antibody are contemplated For example, the humanized antibody or affinity matured antibody may be an antibody fragment, such as a Fab, which is optionally conjugated with one or more cytotoxic agent(s) in order to generate an lmmunoconjugate Alternatively, the humanized antibody or affinity matured antibody may be an intact antibody, such as an intact IgG l antibody (iv) Human antibodies As an alternative to humanization, human antibodies can be generated For example, it is now possible to produce transgenic animals (e g , mice) that are capable, upon immunization, of producing a full repertoire of human antibodies in the absence of endogenous immunoglobulin production For example, it has been described that the homozygous deletion o the antibody heavy-chain joining region (J H ) gene in chimeπc and germ-line mutant mice results in complete inhibition of endogenous antibody production Transfer ofthe human germ-line immunoglobulin gene array in such germ-line mutant mice will result in the production of human antibodies upon antigen challenge See, e g , Jakobovits et al , Proc Natl Acad Sci USA, 90 2551 (1993), Jakobovits et al , Nature, 362 255-258 (1993), Bruggermann et al , Year in lmmuno , 7 33 (1993), and U S Patent Nos 5,591 ,669, 5,589,369 and 5,545,807 Alternatively, phage display technology (McCafferty et al , Nature 348 552-553 ( 1990)) can be used to produce human antibodies and antibody fragments in vitro, from immunoglobulin variable (V) domain gene repertoires from unimmumzed donors According to this technique, antibody V domain genes are cloned in-frame into either a major or minor coat protein gene of a filamentous bacteπophage, such as M 13 or fd, and displayed as functional antibody fragments on the surface of the phage particle Because the filamentous particle contains a single-stranded DNA copy of the phage genome, selections based on the functional properties of the antibody also result in selection of the gene encoding the antibody exhibiting those properties Thus, the phage mimics some of the properties of the B-cell Phage display can be performed in a variety of formats, for their review see, e g , Johnson, Kevin S and Chiswell, David J , Current Opinion in Structural Biology 3 564-571 ( 1993) Several sources of V-gene segments can be used for phage display Clackson et al , Nature, 352 624-628 ( 1991 ) isolated a diverse array of anti-oxazolone antibodies from a small random combinatorial library of V genes derived from the spleens of immunized mice A repertoire of V genes from unimmumzed human donors can be constructed and antibodies to a diverse array of antigens (including self-antigens) can be isolated essentially following the techniques described by Marks et al , J Mol Bwl 222 581-597 (1991), or Griffith et al , EMBO J 12 725-734 (1993) See, also, U S Patent Nos 5,565,332 and 5,573,905 As discussed above, human antibodies may also be generated by in vitro activated B cells (see U S Patents 5,567,610 and 5,229,275) Human antι-ErbB2 antibodies are described in U S Patent No 5,772,997 issued June 30, 1998 and WO 97/00271 published January 3, 1997 (v) Antibody fragments Various techniques have been developed for the production of antibody fragments Traditionally, these fragments were derived via proteolytic digestion of intact antibodies (see, e g , Monmoto ef al , Journal of Biochemical and Biophysical Methods 24 107-1 17 (1992), and Brennan et ai , Science, 229 81 ( 1985)) However, these fragments can now be produced directly by recombinant host cells For example, the antibody fragments can be isolated from the antibody phage libraries discussed above Alternatively, Fab'-SH fragments can be directly recovered from £ coli and chemically coupled to form F(ab 7 ) 2 fragments (Carter et ai , Bio/Technology 10 163- 167 ( 1992)) According to another approach, F(ab') 2 fragments can be isolated directly from recombinant host cell culture Other techniques for the production of antibody fragments will be apparent to the skilled practitioner In other embodiments, the antibody of choice is a single chain Fv fragment (scFv) See WO 93/16185, U S Patent No 5,571 ,894, and U S Patent No 5,587,458 The antibody fragment may also be a "linear antibody", e g , as described in U S Patent 5,641 ,870 for example Such linear antibody fragments may be monospecific or bispecific (vt) Bispecific antibodies Bispecific antibodies are antibodies that have binding specificities for at least two different epitopes Exemplary bispecific antibodies may bind to two different epitopes of the ErbB2 protein Other such antibodies may combine an ErbB2 binding site with binding sιte(s) for EGFR, ErbB3 and/or ErbB4 Alternatively, an anti- ErbB2 arm may be combined with an arm which binds to a triggering molecule on a leukocyte such as a T-cell receptor molecule (e g CD2 or CD3), or Fc receptors for IgG (FcγR), such as FcγRI (CD64), FcγRII (CD32) and FcγRIII (CD 16) so as to focus cellular defense mechanisms to the ErbB2-expre< sing cell Bispecific antibodies may also be used to localize cytotoxic agents to cells which express ErbB2 These antibodies possess an ErbB2-bιndιng arm and an arm which binds the cytotoxic agent (e g sapoπn, anti-interferon-α, vinca alkaloid, πcin A chain, methotrexate or radioactive isotope hapten) Bispecific antibodies can be prepared as full length antibodies or antibody fragments (e g F(ab ), bispecific antibodies) WO 96/16673 describes a bispecific antι-ErbB2/antι-FcγRIII antibody and U S Patent No 5,837,234 discloses a bispecific antι-ErbB2/antι-FcγRI antibody A bispecific antι-ErbB2/Fcα antibody is shown in WO98/02463 U S Patent No 5,821 ,337 teaches a bispecific antι-ErbB2/antι-CD3 antibody Methods for making bispecific antibodies are known in the art Traditional production of full length bispecific antibodies is based on the coexpression of two immunoglobulin heavy chain-light chain pairs, where the two chains have different specificities (Millstein et al , Nature, 305 537-539 (1983)) Because of the random assortment of immunoglobulin heavy and light chains, these hybπdomas (quadromas) produce a potential mixture of 10 different antibody molecules, of which only one has the correct bispecific structure Purification ofthe correct molecule, which is usually done by affinity chromatography steps, is rather cumbersome, and the product yields are low Similar procedures are disclosed in WO 93/08829, and in Traunecker et ai , EMBO J , 10 3655-3659 (1991) According to a different approach, antibody variable domains with the desired binding specificities (antibody-antigen combining sites) are fused to immunoglobulin constant domain sequences The fusion preferably is with an immunoglobulin heavy chain constant domain, comprising at least part of the hinge, CH2, and CH3 regions It is preferred to have the first heavy-chain constant region (CHI ) containing the site necessary for light chain binding, present in at least one of the fusions DNAs encoding the immunoglobulin heavy chain fusions and, if desired, the immunoglobulin light chain, are inserted into separate expression vectors, and are co-transfected into a suitable host organism This provides for great flexibility in adjusting the mutual proportions of the three polypeptide fragments in embodiments when unequal ratios of the three polypeptide chains used in the construction provide the optimum yields It is, however, possible to insert the coding sequences for two or all three polypeptide chains in one expression vector when the expression of at least two polypeptide chains in equal ratios results in high yields or when the ratios are of no particular significance In a preferred embodiment of this approach, the bispecific antibodies are composed of a hybrid immunoglobulin heavy chain with a first binding specificity in one arm, and a hybrid immunoglobulin heavy chain-light chain pair (providing a second binding specificity) in the other arm It was found that this asymmetric structure facilitates the separation of the desired bispecific compound from unwanted immunoglobulin chain combinations, as the presence of an immunoglobulin light chain in only one half of the bispecific molecule provides for a facile way of separation This approach is disclosed in WO 94/04690 For further details of generating bispecific antibodies see, for example, Suresh et al , Methods in Enzvmolog , 121 210 ( 1986) According to another approach described in U S Patent No 5,731 ,168, the interface between a pair of antibody molecules can be engineered to maximize the percentage of heterodimers which are recovered from recombinant cell culture The preferred interface comprises at least a part of the C H 3 domain of an antibody constant domain In this method, one or more small amino acid side chains from the interface of the first antibody molecule are replaced with larger side chains (e g tyrosine or tryptophan) Compensatory "cavities" of identical or similar size to the large side chaιn(s) are created on the interface of the second antibody molecule by replacing large amino acid side chains with smaller ones (e g alanine or threonme) This provides a mechanism for increasing the yield of the heterodimer over other unwanted end-products such as homodimers Bispecific antibodies include cross-linked or "heteroconjugate" antibodies For example, one of the antibodies in the heteroconjugate can be coupled to avidin, the other to biotin Such antibodies have, for example, been proposed to target immune system cells to unwanted cells (U S Patent No 4,676,980), and for treatment of HIV infection (WO 91/00360, WO 92/200373, and EP 03089) Heteroconjugate antibodies may be made using any convenient cross-linking methods Suitable cross-linking agents are well known in the art, and are disclosed in U S Patent No 4,676,980, along with a number of cross-linking techniques Techniques for generating bispecific antibodies from antibody fragments have also been described in the literature For example, bispecific antibodies can be prepared using chemical linkage Brennan et al , Science, 229 81 (1985) describe a procedure wherein intact antibodies are proteolytically cleaved to generate F(ab fragments These fragments are reduced in the presence of the dithiol complexing agent sodium arsenite to stabilize vicinal dithiols and prevent intermolecular disulfide formation The Fab' fragments generated are then converted to thio trobenzoate (TNB) derivatives One of the Fab'-TNB derivatives is then reconverted to the Fab'-thiol by reduction with mercaptoethylamine and is mixed with an equimolar amount ofthe other Fab'-TNB derivative to form the bispecific antibody The bispecific antibodies produced can be used as agents for the selective immobilization of enzymes Recent progress has facilitated the direct recovery of Fab'-SH fragments from E coli, which can be chemically coupled to form bispecific antibodies Shalaby et al , J Exp Med , 175 217 225 (1992) describe the production of a fully humanized bispecific antibody F(ab'>2 molecule Each Fab' fragment was separately secreted from E coli and subjected to directed chemical coupling in vitro to form the bispecific antibody The bispecific antibody thus formed was able to bind to cells overexpressing the ErbB2 receptor and normal human T cells, as well as trigger the lytic activity of human cytotoxic lymphocytes against human breast tumor targets Various techniques for making and isolating bispecific antibody fragments directly from recombinant cell culture have also been described For example, bispecific antibodies have been produced using leucine zippers Kostelny et ai , J Immunol , 148(5) 1547-1553 (1992) The leucine zipper peptides from the Fos and Jun proteins were linked to the Fab' portions of two different antibodies by gene fusion The antibody homodimers were reduced at the hinge region to form monomers and then re-oxidized to form the antibody heterodimers This method can also be utilized for the production of antibody homodimers The "diabody" technology described by Holhnger etai Proc Natl Acad Sci USA, 90 6444-6448 (1993) has provided an alternative mechanism for making bispecific antibody fragments The fragments comprise a heavy-chain variable domain (V H ) connected to a light-chain variable domain (V L ) by a linker which is too short to allow pairing between the two domains on the same chain Accordingly, the V H and V L domains of one fragment are forced to pair with the complementary V L and V H domains of another fragment, thereby forming two antigen-binding sites Another strategy for making bispecific antibody fragments by the use of single-chain Fv (sFv) dimers has also been reported See Gruber etai , J Immunol , 152 5368 ( 1994) Antibodies with more than two valencies are contemplated For example, tπspecific antibodies can be prepared Tull et al J Immunol 147 60 ( 1991 ) (va) Other amino acid sequence modifications Amino acid sequence modιficatιon(s) of the antι-ErbB2 antibodies described herein are contemplated For example, it may be desirable to improve the binding affinity and/or other biological properties of the antibody Amino acid sequence variants of the antι-ErbB2 antibody are prepared by introducing appropriate nucleotide changes into the antι-ErbB2 antibody nucleic acid, 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 antι-ErbB2 antibody Any combination of deletion, insertion, and substitution is made to arrive at the final construct, provided that the final construct possesses the desired characteristics The amino acid changes also may alter post-translational processes of the antι-ErbB2 antibody, such as changing the number or position ol glycosylation sites A useful method for identification of certain residues or regions of the antι-ErbB2 antibody that are preferred locations for mutagenesis is called "alanine scanning mutagenesis" as described by Cunningham and Wells Science, 244 1081-1085 (1989) Here, a residue or group of target residues are identified (e g , charged residues such as arg, asp, his, lys, and glu) and replaced by a neutral or negatively charged amino acid (most preferably alanine or polyalanine) to affect the interaction of the amino acids with ErbB2 antigen Those amino acid locations demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at, or for, the sites of substitution Thus, while the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined For example, to analyze the performance of a mutation at a given site, ala scanning or random mutagenesis is conducted at the target codon or region and the expressed antι-ErbB2 antibody variants are screened for the desired activity 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 an antι-ErbB2 antibody with an N terminal methionyl residue or the antibody fused to a cytotoxic polypeptide Other insertional variants of the antι-ErbB2 antibody molecule include the fusion to the N- or C-terminus of the antι-ErbB2 antibody to an enzyme (e g for ADEPT) or a polypeptide which increases the serum half-life of the antibody Another type of variant is an amino acid substitution variant These variants have at least one amino acid residue in the antι-ErbB2 antibody molecule replaced by a different residue The sites of greatest interest for substitutional mutagenesis include the hypervanable regions, but FR alterations are also contemplated Conservative substitutions are shown in Table 1 under the heading of preferred substitutions" If such substitutions result in a change in biological activity, then more substantial changes, denominated ' exemplary substitutions' in Table 1 , or as further described below in reference to amino acid classes, may be introduced and the products screened Table 1 Substantial modifications in the biological properties of the antibody are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or he] ical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain Naturally occurring residues are divided into groups based on common side-chain properties (1 ) hydrophobic norleucine, met, ala, val, leu, lie, (2) neutral hydrophihc cys, ser, thr, (3) acidic asp, glu, (4) basic asn, gin, his, lys, arg, (5) residues that influence chain orientation gly, pro, and (6) aromatic trp, tyr, phe Non-conservative substitutions will entail exchanging a member of one of these classes for another class Any cysteine residue not involved in maintaining the proper conformation of the antι-ErbB2 antibody also may be substituted, generally with seπne, to improve the oxidative stability of the molecule and prevent aberrant crosshnking Conversely, cysteine bond(s) may be added to the antibody to improve its stability (particularly where the antibody is an antibody fragment such as an Fv fragment) A particularly preferred type of substitutional variant involves substituting one or more hypervanable region residues of a parent antibody (e g a humanized or human antibody) Generally, the resulting vaπant(s) selected for further development will have improved biological properties relative to the parent antibody from which they are generated A convenient way for generating such substitutional variants involves affinity maturation using phage display Briefly, several hypervanable region sites (e g 6-7 sites) are mutated to generate all possible amino substitutions at each site The antibody variants thus generated are displayed in a monovalent fashion from filamentous phage particles as fusions to the gene III product of M 13 packaged within each particle The phage- displayed variants are then screened for their biological activity (e g binding affinity) as herein disclosed In order to identify candidate hypervanable region sites for modification, alanine scanning mutagenesis can be performed to identify hypervanable region residues contributing significantly to antigen binding Alternatively, or additionally, it may be beneficial to analyze a crystal structure ofthe antigen-antibody complex to identify contact points between the antibody and human ErbB2 Such contact residues and neighboring residues are candidates for substitution according to the techniques elaborated herein Once such variants are generated, the panel of variants is subjected to screening as described herein and antibodies with superior properties in one or more relevant assays may be selected for further development Another type of amino acid variant ofthe antibody alters the original glycosylation pattern ofthe antibody By altering is meant deleting one or more carbohydrate moieties found in the antibody, and/or adding one or more glycosylation sites that are not present in the antibody Glycosylation of antibodies is typically either N-hnked or O-lmked N-hnked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue The tπpeptide sequences asparagine X-seπne and asparagine-X-threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain Thus, the presence of either of these tπpeptide sequences in a polypeptide creates a potential glycosylation site O-linked glycosylation refers to the attachment of one of the sugars N-aceylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly seπne or threonine, although 5-hydroxyprohne or 5-hydroxylysιne may also be used Addition of glycosylation sites to the antibody is conveniently accomplished by altering the amino acid sequence such that it contains one or more of the above-described tπpeptide sequences (for N-hnked glycosylation sites) The alteration may also be made by the addition of, or substitution by, one or more seπne or threonine residues to the sequence of the original antibody (for O-hnked glycosylation sites) Nucleic acid molecules encoding amino acid sequence variants of the antι-ErbB2 antibody are prepared by a variety of methods known in the art These methods include, but are not limited to, isolation from a natural source (in the case of naturally occurring amino acid sequence variants) or preparation by ohgonucleotide-mediated (or site- directed) mutagenesis, PCR mutagenesis, and cassette mutagenesis of an earlier prepared variant or a non-variant version of the antι-ErbB2 antibody It may be desirable to modify the antibody of the invention with respect to effector function, e g so as to enhance antigen-dependent cell-mediated cyotoxicity (ADCC) and/or complement dependent cytotoxicity (CDC) of the antibody This may be achieved by introducing one or more amino acid substitutions in an Fc region of the antibody Alternatively or additionally, cysteine resιdue(s) may be introduced in the Fc region, thereby allowing interchain disulfide bond formation in this region The homodimeπc antibody thus generated may have improved mternalization capability and/or increased complement-mediated cell killing and antibody-dependent cellular cytotoxicity (ADCC) See Caron et ai , J Exp Med 176 1 191 - 1 195 ( 1 92) and Shopes, B J Immunol 148 2918- 2922 (1992) Homodimeπc antibodies with enhanced anti-tumor activity may also be prepared using heterobifunctional cross-linkers as described in Wolff etai Cancer Research 53 2560-2565 (1993) Alternatively, an antibody can be engineered which has dual Fc regions and may thereby have enhanced complement lysis and ADCC capabilities See Stevenson et al Anti-Cancer Drug Design 3 219-230 (1989) To increase the serum half life ofthe antibody, one may incorporate a salvage receptor binding epitope into the antibody (especially an antibody fragment) as described in U S Patent 5,739,277, for example As used herein, the term "salvage receptor binding epitope' refers to an epitope of the Fc region of an IgG molecule (e g , IgG j , IgG 2 , IgG 3 , or IgG ) that is responsible for increasing the in vivo serum half-life of the IgG molecule (vui) Screening for antibodies with the desired properties Techniques for generating antibodies have been described above One may further select antibodies with certain biological characteristics, as desired To identify an antibody which blocks ligand activation of an ErbB receptor, the ability of the antibody to block ErbB ligand binding to cells expressing the ErbB receptor (e g in conjugation with another ErbB receptor with which the ErbB receptor of interest forms an ErbB hetero-ohgomer) may be determined For example, cells naturally expressing, or transfected to express, ErbB receptors of the ErbB hetero-ohgomer may be incubated with the antibody and then exposed to labeled ErbB ligand The ability of the anti ErbB2 antibody to block ligand binding to the ErbB receptor in the ErbB hetero-ohgomer may then be evaluated For example, inhibition of HRG binding to MCF7 breast tumor cell lines by anti ErbB2 antibodies may be performed using monolayer MCF7 cultures on ice in a 24-well-plate format essentially as described in Example 1 125 below Antι-ErbB2 monoclonal antibodies may be added to each well and incubated for 30 minutes I-labeled rHRGβl ]77 22 (25 pm) may then be added, and the incubation may be continued for 4 to 16 hours Dose response curves may be prepared and an IC 50 value may be calculated for the antibody of interest In one embodiment, the antibody which blocks ligand activation of an ErbB receptor will have an IC 50 for inhibiting HRG binding to MCF7 cells in this assay of about 50nM or less, more preferably lOnM or less Where the antibody is an antibody fragment such as a Fab fragment, the IC 50 for inhibiting HRG binding to MCF7 cells in this assay may, for example, be about 1 OOnM or less, more preferably 50nM or less Alternatively, or additionally, the ability of the antι-ErbB2 antibody to block ErbB hgand-stimulated tyrosine phosphorylation of an ErbB receptor present in an ErbB hetero-ohgomer may be assessed For example, cells endogenously expressing the ErbB receptors or transfected to expressed them may be incubated with the antibody and then assayed for ErbB hgand-dependent tyrosine phosphorylation activity using an anti- phosphotyrosine monoclonal (which is optionally conjugated with a detectable label) The kinase receptor activation assay described in U S Patent No 5,766,863 is also available for determining ErbB receptor activation and blocking of that activity by an antibody In one embodiment, one may screen for an antibody which inhibits HRG stimulation of pi 80 tyrosine phosphorylation in MCF7 cells essentially as described in Example 1 below For example, the MCF7 cells may be plated in 24-well plates and monoclonal antibodies to ErbB2 may be added to each well and incubated for 30 minutes at room temperature, then rHRGβl ] 77-244 may be added to each well to a final concentration of 0 2 nM, and the incubation may be continued for 8 minutes Media may be aspirated from each well, and reactions may be stopped by the addition of 100 μl of SDS sample buffer (5% SDS, 25 mM DTT, and 25 mM Tris-HCl, pH 6 8) Each sample (25 μl) may be electrophoresed on a 4-12% gradient gel (Novex) and then electrophoretically transferred to polyvinyhdene difluoπde membrane Antiphosphotyrosine (at 1 μg/ml) immunoblots may be developed, and the intensity of the predominant reactive band at M r ~ 180,000 may be quantified by reflectance densitometry The antibody selected will preferably significantly inhibit HRG stimulation of pi 80 tyrosine phosphorylation to about 0-35% of control in this assay A dose-response curve for inhibition of HRG stimulation of pi 80 tyrosine phosphorylation as determined by reflectance densitometry may be prepared and an IC,,, for the antibody of interest may be calculated In one embodiment, the antibody which blocks ligand activation of an ErbB receptor will have an IC 50 for inhibiting HRG stimulation of pi 80 tyrosine phosphorylation in this assay of about 50nM or less, more preferably lOnM or less Where the antibody is an antibody fragment such as a Fab fragment, the IC 50 for inhibiting HRG stimulation of pi 80 tyrosine phosphorylation in this assay may, for example, be about 1 OOnM or less, more preferably 50nM or less One may also assess the growth inhibitory effects ofthe antibody on MDA-MB- 175 cells, e g, essentially as described in Schaefer erα/ Oncogene 15 1385-1394 (1997) According to this assay, MDA-MB- 175 cells may treated with an antι-ErbB2 monoclonal antibody (lOμg/mL) for 4 days and stained with crystal violet Incubation with an antι-ErbB2 antibody may show a growth inhibitory effect on this cell line similar to that displayed by monoclonal antibody 2C4 In a further embodiment, exogenous HRG will not significantly reverse this inhibition Preferably, the antibody will be able to inhibit cell proliferation of MDA-MB-175 cells to a greater extent than monoclonal antibody 4D5 (and optionally to a greater extent than monoclonal antibody 7F3), both in the presence and absence of exogenous HRG In one embodiment, the antι-ErbB2 antibody of interest may block heregulin dependent association of ErbB2 with ErbB3 in both MCF7 and SK-BR 3 cells as determined in a co-immunoprecipitation experiment such as that described in Example 2 substantially more effectively than monoclonal antibody 4D5, and preferably substantially more effectively than monoclonal antibody 7F3 To identify growth inhibitory antι-ErbB2 antibodies, one may screen for antibodies which inhibit the growth of cancer cells which overexpress ErbB2 In one embodiment, the growth inhibitory antibody of choice is able to inhibit growth of SK-BR-3 cells in cell culture by about 20-100% and preferably by about 50- 100% at an antibody concentration of about 0 5 to 30 μg/ml To identify such antibodies, the SK-BR-3 assay described in U S Patent No 5,677,171 can be performed According to this assay, SK-BR-3 cells are grown in a 1 1 mixture of F12 and DMEM medium supplemented with 10% fetal bovine serum, glutamine and penicillin streptomycin The SK-BR 3 cells are plated at 20,000 cells in a 35mm cell culture dish (2mls/35mm dish) 05 to 30 μg/ml ofthe antι-ErbB2 antibody is added per dish After six days, the number of cells, compared to untreated cells are counted using an electronic COULTER™ cell counter Those antibodies which inhibit growth of the SK-BR-3 cells by about 20- 100% or about 50-100% may be selected as growth inhibitory antibodies To select for antibodies which induce cell death, loss of membrane integrity as indicated by, e g , PI, trypan blue or 7AAD uptake may be assessed relative to control The preferred assay is the PI uptake assay using BT474 cells According to this assay, BT474 cells (which can be obtained from the American Type Culture Collection (Rockville, MD)) are cultured in Dulbecco's Modified Eagle Medium (D-MEM) Ham's F 12 (50 50) supplemented with 10% heat-inactivated FBS (Hyclone) and 2 M L-glutamine (Thus, the assay is performed in the absence of complement and immune effector cells) The BT474 cells are seeded at a density of 3 x 10 per dish in 100 x 20 mm dishes and allowed to attach overnight The medium is then removed and replaced with fresh medium alone or medium containing lOμg/ml of the appropriate monoclonal antibody The cells are incubated for a 3 day time period Following each treatment, monolayers are washed with PBS and detached by trypsimzation Cells are then centrifuged at 1200rpm for 5 minutes at 4°C, the pellet resuspended in 3 ml ice cold Ca binding buffer (10 mM Hepes, pH 7 4, 140 mM NaCl, 2 5 mM CaCl 2 ) and ahquoted into 35 mm strainer-capped 12 x 75 tubes (1ml per tube, 3 tubes per treatment group) for removal of cell clumps Tubes then receive PI (lOμg/ml) Samples may be analyzed using a FACSCAN™ flow cytometer and FACSCONVERT™ CellQuest software (Becton Dickinson) Those antibodies which induce statistically significant levels of cell death as determined by PI uptake may be selected as cell death-inducing antibodies In order to select for antibodies which induce apoptosis, an annexin binding assay using BT474 cells is available The BT474 cells are cultured and seeded in dishes as discussed in the preceding paragraph The medium is then removed and replaced with fresh medium alone or medium containing lOμg/ml ofthe monoclonal antibody Following a three day incubation period, monolayers are washed with PBS and detached by trypsimzation Cells are then centrifuged, resuspended in Ca binding buffer and ahquoted into tubes as discussed above for the cell death assay Tubes then receive labeled annexin (e g annexin V-FTIC) (1 μg/ml) Samples may be analyzed using a FACSCAN™ flow cytometer and FACSCONVERT™ CellQuest software (Becton Dickinson) Those antibodies which induce statistically significant levels of annexin binding relative to control are selected as apoptosis-inducing antibodies In addition to the annexin binding assay, a DNA staining assay using BT474 cells is available In order to perform this assay, BT474 cells which have been treated with the antibody of interest as described in the preceding two paragraphs are incubated with 9μg/ml HOECHST 33342™ for 2 hr at 37°C, then analyzed on an EPICS ELITE™ flow cytometer (Coulter Corporation) using MODFIT LT™ software (Verity Software House) Antibodies which induce a change in the percentage of apoptotic cells which is 2 fold or greater (and preferably 3 fold or greater) than untreated cells (up to 100% apoptotic cells) may be selected as pro-apoptotic antibodies using this assay To screen for antibodies which bind to an epitope on ErbB2 bound by an antibody of interest, a routine cross- blocking assay such as that described in Antibodies, A Laboratory Manual, Cold Spring Harbor Laboratory, Ed Harlow and David Lane (1988), can be performed Alternatively, or additionally, epitope mapping can be performed by methods known in the art (see, e g Figs 1 A and IB herein) (ix) Immunoconjugates The invention also pertains to immunoconjugates comprising an antibody conjugated to a cytotoxic agent such as a chemotherapeutic agent, toxin (e g a small molecule toxin or an enzymatically active toxin of bacterial, fungal, plant or animal origin, including fragments and/or variants thereof), or a radioactive isotope (i , a radioconjugate) Chemotherapeutic agents useful in the generation of such immunoconjugates have been described above Conjugates of an antibody and one or more small molecule toxins, such as a calicheamicin, a maytansine (U S Patent No 5,208,020), a tπchothene, and CC1065 are also contemplated herein In one preferred embodiment of the invention, the antibody is conjugated to one or more maytansine molecules (e g about 1 to about 10 maytansine molecules per antibody molecule) Maytansine may, for example, be converted to May-SS-Me which may be reduced to May-SH3 and reacted with modified antibody (Chan et al Cancer Research 52 127-131 (1992)) to generate a maytansinoid-antibody lmmunoconjugate Another lmmunoconjugate of interest comprises an antι-ErbB2 antibody conjugated to one or more calicheamicin molecules The calicheamicin family of antibiotics are capable of producing double-stranded DNA breaks at sub-picomolar concentrations Structural analogues of calicheamicin which may be used include, but are not limited to, γ , α 2 ', α 3 ', N-acetyl γ , PSAG and θ 1 , (Hinman et ai Cancer Research 53 3336-3342 (1993) and Lode et ai Cancer Research 58 2925-2928 (1998)) See, also, US Patent Nos 5,714,586, 5,712,374, 5,264,586, and 5,773,001 expressly incorporated herein by reference Enzymatically active toxins and fragments thereof which can be used include diphtheria A chain, nonbmding active fragments of diphtheria toxin, exotoxin A chain (from Pseudomonas aeruginosa), πcin A chain, abπn A chain, modeccin A chain, alpha-sarcin, Aleuntes fordii proteins, dianthin proteins, Phytolaca americana proteins (PAPI, PAPII, and PAP-S), momordica charantia inhibitor, curcin, crotin, sapaonana officinalis inhibitor, gelonin, mitogelhn, restnctocin, phenomycin, enomycin and the tπcothecenes See, for example, WO 93/21232 published October 28, 1993 The present invention further contemplates an lmmunoconjugate formed between an antibody and a compound with nucleolytic activity (e g a πbonuclease or a DNA endonuclease such as a deoxyπbonuclease, DNase) A variety of radioactive isotopes are available for the production of radioconjugated antι-ErbB2 antibodies Examples include At , 1 , 1 , Y , Re , Re , Sm , Bi , P and radioactive isotopes of Lu Conjugates ofthe antibody and cytotoxic agent may be made using a variety of bifunctional protein coupling agents such as N-succιnιmιdyl-3-(2-pyπdyldιthιol) propionate (SPDP), succιnιmιdyl-4-(N-maleιmιdomethyl) cyclohexane-1 -carboxylate, lminothiolane (IT), bifunctional derivatives of lmidoesters (such as dimethyl adipimidate HCL), active esters (such as disuccinimidyl suberate), aldehydes (such as glutareldehyde), bis-azido compounds (such as bis (p-azidobenzoyl) hexanediamine), bis-diazonium derivatives (such as bιs-(p- diazoniumbenzoy -ethylenediamine), dnsocyanates (such as tolyene 2,6-dnsocyanate), and bis-active fluorine compounds (such as l ,5-dιfluoro-2,4-dιnιtrobenzene) For example, a πcin lmmunotoxin can be prepared as described in Vitetta etai Science 238 1098 ( 1987) Carbon- 14-labeled l-ιsothιocyanatobenzyl-3-methyldιethylene tπaminepentaacetic acid (MX-DTPA) is an exemplary chelating agent for conjugation of radionucleotide to the antibody See W094/1 1026 The linker may be a "cleavable linker" facilitating release ofthe cytotoxic drug in the cell For example, an acid-labile linker, peptidase-sensitive linker, dimethyl linker or disulfide-contaming linker (Chaπ ef α/ Cancer Research 52 127-131 (1992)) may be used Alternatively, a fusion protein comprising the antι-ErbB2 antibody and cytotoxic agent may be made, e g by recombinant techniques or peptide synthesis In yet another embodiment, the antibody may be conjugated to a ' receptor" (such streptavidin) for utilization in tumor pretargeting wherein the antibody-receptor conjugate is administered to the patient, followed by removal of unbound conjugate from the circulation using a clearing agent and then administration of a "ligand" (e g avidin) which is conjugated to a cytotoxic agent (e g a radionucleotide) (x) Antibody Dependent Enzyme Mediated Prodi ug Therapy (ADEPT) The antibodies of the present invention may also be used in ADEPT by conjugating the antibody to a prodrug-acti vating enzyme which converts a prodrug (e g a peptidyl chemotherapeutic agent, see W081/01 145) to an active anti-cancer drug See, for example, WO 88/07378 and U S Patent No 4,975,278 The enzyme component of the lmmunoconjugate useful for ADEPT includes any enzyme capable of acting on a prodrug in such a way so as to covert it into its more active, cytotoxic form Enzymes that are useful in the method of this invention include, but are not limited to, alkaline phosphatase useful for converting phosphate-containing prodrugs into free drugs, arylsulfatase useful for converting sulfate- containing prodrugs into free drugs, cytosine deaminase useful for converting non-toxic 5-fluorocytosιne into the anti-cancer drug, 5-fluorouracιl, proteases, such as serratia protease, thermolysin, subtilisin, carboxypeptidases and cathepsins (such as cathepsins B and L), that are useful for converting peptide-containing prodrugs into free drugs, D-alanylcarboxypeptidases, useful for converting prodrugs that contain D-amino acid substituents, carbohydrate- cleaving enzymes such as β-galactosidase and neuraminidase useful for converting glycosylated prodrugs into free drugs, β-lactamase useful for converting drugs deπvatized with β-lactams into free drugs, and penicillin amidases, such as penicillin V amidase or penicillin G amidase, useful for converting drugs deπvatized at their amine nitrogens with phenoxyacetyl or phenylacetyl groups, respectively, into free drugs Alternatively, antibodies with enzymatic activity, also known in the art as "abzymes", can be used to convert the prodrugs of the invention into free active drugs (see, e g , Massey, Nature 328 457-458 (1987)) Antibody-abzyme conjugates can be prepared as described herein for delivery of the abzyme to a tumor cell population The enzymes of this invention can be covalently bound to the antι-ErbB2 antibodies by techniques well known in the art such as the use of the heterobifunctional crosshnking reagents discussed above Alternatively, fusion proteins comprising at least the antigen binding region of an antibody of the invention linked to at least a functionally active portion of an enzyme ofthe invention can be constructed using recombinant DNA techniques well known in the art (see, e g , Neuberger et ai , Nature, 312 604-608 (1984) (xi) Other antibody modifications Other modifications of the antibody are contemplated herein For example, the antibody may be linked to one of a variety of nonproteinaceous polymers, e g , polyethylene glycol, polypropylene glycol, polyoxyalkylenes, or copolymers of polyethylene glycol and polypropylene glycol The antibody also 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 's Pharmaceutical Sciences, 16th edition, Oslo, A , Ed , (1980) The antι-ErbB2 antibodies disclosed herein may also be formulated as immunoliposomes Liposomes containing the antibody are prepared by methods known in the art, such as described in Epstein et al Proc Natl Acad Sci USA, 82 3688 (1985), Hwang et al , Proc Natl Acad Set USA, 77 4030 ( 1980), U S Pat Nos 4,485,045 and 4,544,545, and W097/38731 published October 23, 1997 Liposomes with enhanced circulation time are disclosed in U S Patent No 5,013,556 Particularly useful liposomes can be generated by the reverse phase evaporation method with a hpid composition comprising phosphatidylchohne, cholesterol and PEG-deπvatized phosphatidylethanolamine (PEG-PE) Liposomes are extruded through filters of defined pore size to yield liposomes with the desired diameter Fab' fragments of the antibody of the present invention can be conjugated to the liposomes as described in Martin et ai J Bwl Chem 257 286-288 (1982) via a disulfide interchange reaction A chemotherapeutic agent is optionally contained within the hposome See Gabizon et al J National Cancer Inst 81(19)1484 (1989) III. Vectors, Host Cells and Recombinant Methods The invention also provides isolated nucleic acid encoding the humanized antι-ErbB2 antibody, vectors and host cells comprising the nucleic acid, and recombinant techniques for the production of the antibody For recombinant production of the antibody, the nucleic acid encoding it is isolated and inserted into a rep cable vector for further cloning (amplification of the DNA) or for expression DNA encoding the monoclonal antibody is readily isolated and sequenced using conventional procedures (e g , by using oligonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains ofthe antibody) Many vectors are available The vector components generally include, but are not limited to, one or more ofthe following a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence (i) Signal sequence component The antι-ErbB2 antibody of this invention may be produced recombinantly not only directly, but also as a fusion polypeptide with a heterologous polypeptide, which is preferably a signal sequence or other polypeptide having a specific cleavage site at the N-terminus of the mature protein or polypeptide The heterologous signal sequence selected preferably is one that is recognized and processed (* e , cleaved by a signal peptidase) by the host cell For prokaryotic host cells that do not recognize and process the native antι-ErbB2 antibody signal sequence, the signal sequence is substituted by a prokaryotic signal sequence selected, for example, from the group of the alkaline phosphatase, penicilhnase, lpp, or heat-stable enterotoxin II leaders For yeast secretion the native signal sequence may be substituted by, e g , the yeast invertase leader, α factor leader (including Saccharonnces and Klmveromyces α-factor leaders), or acid phosphatase leader, the C albicans glucoamylase leader, or the signal described in WO 90/13646 In mammalian cell expression, mammalian signal sequences as well as viral secretory leaders, for example, the herpes simplex gD signal, are available The DNA for such precursor region is ligated in reading frame to DNA encoding the anti ErbB2 antibody (n) Origin of replication component Both expression and cloning vectors contain a nucleic acid sequence that enables the vector to replicate in one or more selected host cells Generally, in cloning vectors this sequence is one that enables the vector to replicate independently of the host chromosomal DNA, and includes origins of replication or autonomously replicating sequences Such sequences are well known for a variety of bacteria, yeast, and viruses The origin of replication from the plasmid pBR322 is suitable for most Gram-negative bacteria, the 2μ plasmid origin is suitable for yeast, and various viral origins (SV40, polyoma, adenovirus, VSV or BPV) are useful for cloning vectors in mammalian cells Generally, the origin of replication component is not needed for mammalian expression vectors (the SV40 origin may typically be used only because it contains the early promoter) (in) Selection gene component Expression and cloning vectors may contain a selection gene, also termed a selectable marker Typical selection genes encode proteins that (a) confer resistance to antibiotics or other toxins, e g , ampicilhn, neomycin, methotrexate, or tetracycline, (b) complement auxotrophic deficiencies, or (c) supply critical nutrients not available from complex media, e g , the gene encoding D-alanine racemase for Bacilli One example of a selection scheme utilizes a drug to arrest growth of a host cell Those cells that are successfully transformed with a heterologous gene produce a protein conferring drug resistance and thus survive the selection regimen Examples of such dominant selection use the drugs neomycin, mycophenolic acid and hygromycin Another example of suitable selectable markers for mammalian cells are those that enable the identification of cells competent to take up the antι-ErbB2 antibody nucleic acid, such as DHFR, thymidine kinase, metallothιoneιn-I and -II, preferably primate metallothionein genes, adenosine deaminase, ornithine decarboxylase, etc For example, cells transformed with the DHFR selection gene are first identified by cultuπng all of the transformants in a culture medium that contains methotrexate (Mtx), a competitive antagonist of DHFR An appropriate host cell when wild-type DHFR is employed is the Chinese hamster ovary (CHO) cell line deficient in DHFR activity Alternatively, host cells (particularly wild-type hosts that contain endogenous DHFR) transformed or co- transformed with DNA sequences encoding antι-ErbB2 antibody, wild-type DHFR protein, and another selectable marker such as aminoglycoside 3'-phosphotransferase (APH) can be selected by cell growth in medium containing a selection agent for the selectable marker such as an aminoglycosidic antibiotic, e g kanamycin, neomycin, or G418 See U S Patent No 4,965,199 A suitable selection gene for use in yeast is the trpλ gene present in the yeast plasmid YRp7 (Stinchcomb et al , Nature, 282 39 (1979)) The f l gene provides a selection marker for a mutant strain ofyeast lacking the ability to grow in tryptophan, for example, ATCC No 44076 or PEP4-1 Jones, Genetics, 85 12 (1977) The presence of the trpλ lesion in the yeast host cell genome then provides an effective environment for detecting transformation by growth in the absence of tryptophan Similarly, ej<2-deficιent yeast strains (ATCC 20,622 or 38,626) are complemented by known plasmids bearing the Leu2 gene In addition, vectors derived from the 1 6 μm circular plasmid pKDl can be used for transformation of Kluy veromyces yeasts Alternatively, an expression system for large-scale production of recombinant calf chymosin was reported for A" lactis Van den Berg, Bio/Technology , 8 135 ( 1990) Stable multi-copy expression vectors for secretion of mature recombinant human serum albumin by industrial strains of Kluyveromyces have also been disclosed Fleer et ai , Bio Technology, 9 968-975 ( 1991 ) (iv) Promoter component Expression and cloning vectors usually contain a promoter that is recognized by the host organism and is operably linked to the antι-ErbB2 antibody nucleic acid Promoters suitable for use with prokaryotic hosts include the phoA promoter , β-lactamase and lactose promoter systems, alkaline phosphatase, a tryptophan (trp) promoter system, and hybrid promoters such as the tac promoter However, other known bacterial promoters are suitable Promoters for use in bacterial systems also will contain a Shine-Dalgarno (S D ) sequence operably linked to the DNA encoding the antι-ErbB2 antibody Promoter sequences are known for eukaryotes Virtually all eukaryotic genes have an AT-πch region located approximately 25 to 30 bases upstream from the site where transcription is initiated Another sequence found 70 to 80 bases upstream from the start of transcription of many genes is a CNCAAT region where N may be any nucleotide At the 3' end of most eukaryotic genes is an AATAAA sequence that may be the signal for addition of the poly A tail to the 3' end of the coding sequence All of these sequences are suitably inserted into eukaryotic expression vectors Examples of suitable promoting sequences for use with yeast hosts include the promoters for 3- phosphoglycerate kinase or other glycolytic enzymes, such as enolase, glyceraldehyde-3-phosphate dehydrogenase, hexokinase, pyruvate decarboxylase, phosphofructokinase, glucose-6-phosphate isomerase, 3-phosphoglycerate mutase, pyruvate kinase, tπosephosphate isomerase, phosphoglucose isomerase, and glucokinase Other yeast promoters, which are inducible promoters having the additional advantage of transcription controlled by growth conditions, are the promoter regions for alcohol dehydrogenase 2, isocytochrome C, acid phosphatase, degradative enzymes associated with nitrogen metabolism, metallothionem, glyceraldehyde-3-phosphate dehydrogenase, and enzymes responsible for maltose and galactose utilization Suitable vectors and promoters for use in yeast expression are further described in EP 73,657 Yeast enhancers also are advantageously used with yeast promoters Antι-ErbB2 antibody transcription from vectors in mammalian host cells is controlled, for example, by promoters obtained from the genomes of viruses such as polyoma virus, fowlpox virus, adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and most preferably Simian Virus 40 (SV40), from heterologous mammalian promoters, e g the actin promoter or an immunoglobulin promoter, from heat-shock promoters, provided such promoters are compatible with the host cell systems The early and late promoters of the SV40 virus are conveniently obtained as an SV40 restriction fragment that also contains the SV40 viral origin of replication The immediate early promoter ofthe human cytomegalovirus is conveniently obtained as a Hindlll E restriction fragment A system for expressing DNA in mammalian hosts using the bovine papilloma virus as a vector is disclosed in U S Patent No 4,419,446 A modification of this system is described in U S Patent No 4,601 ,978 See also Reyes et al , Nature 297 598 601 (1982) on expression of human β-interferon cDNA in mouse cells under the control of a thymidine kinase promoter from herpes simplex virus Alternatively, the rous sarcoma virus long terminal repeat can be used as the promoter (v) Enhancer element component Transcription of a DNA encoding the antι-ErbB2 antibody of this invention by higher eukaryotes is often increased by inserting an enhancer sequence into the vector Many enhancer sequences are now known from mammalian genes (globin, elastase, albumin, α-fetoprotein, and insulin) Typically, however, one will use an enhancer from a eukaryotic cell virus Examples include the SV40 enhancer on the late side of the replication origin (bp 100-270), the cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers See also Yaniv, Nature 297 17-18 (1982) on enhancing elements for activation of eukaryotic promoters The enhancer may be spliced into the vector at a position 5' or 3' to the antι-ErbB2 antibody-encoding sequence, but is preferably located at a site 5' from the promoter (vi) Transcription termination component Expression vectors used in eukaryotic host cells (yeast, fungi, insect, plant, animal, human, or nucleated cells from other multicellular organisms) will also contain sequences necessary for the termination of transcription and for stabilizing the mRNA Such sequences are commonly available from the 5 'and, occasionally 3 , untranslated regions of eukaryotic or viral DNAs or cDNAs These regions contain nucleotide segments transcribed as polyadenylated fragments in the untranslated portion of the mRNA encoding antι-ErbB2 antibody One useful transcription termination component is the bovine growth hormone polyadenylation region See W094/1 1026 and the expression vector disclosed therein (vu) Selection and transformation of host cells Suitable host cells for cloning or expressing the DNA in the vectors herein are the prokaryote, yeast, or higher eukaryote cells described above Suitable prokaryotes for this purpose include eubacteπa, such as Gram- negative or Gram-positive organisms, for example, Enterobacteπaceae such as Escherichia, e g , E coli, Enterobacter, Erwinia, Klebsiella, Proteus, Salmonella, e g , Salmonella typhimurium, Serratia, e g , Serratia marcescans, and Shigella, as well as Bacilli such as B subtihs and B lichemformis (e g , B licheniformis 41P disclosed in DD 266,710 published 12 April 1989), Pseudomonas such as P aeruginosa, and Streptomyces One preferred E colt cloning host is E coli 294 (ATCC 31 ,446), although other strains such as E colt B, E coli XI 776 (ATCC 31 ,537), and E colt W3110 (ATCC 27,325) are suitable These examples are illustrative rather than limiting In addition to prokaryotes, eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for antι-ErbB2 antibody-encoding vectors Saccharomyces cerevtsiae, or common baker's yeast, is the most commonly used among lower eukaryotic host microorganisms However, a number of other genera, species, and strains are commonly available and useful herein, such as Schizosaccharomycespom.be, Klws veromyces hosts such as, e g , K lactis, K fragilts (ATCC 12,424), K bulgaricus (ATCC 16,045), K wickeramu (ATCC 24,178), K waltu (ATCC 56,500), K drosophilarum (ATCC 36,906), K thermotolerans, and K marxwnus yarrowia (EP 402,226), Pichia pastoris (EP 183,070), Candida, Trichoderma reesia (EP 244,234), Neurospora crassa, Schwannwmyces such as Schwannwmyces occidentals, and filamentous fungi such as, e g , Neurospora, Penicilltum, Tolypocladium, and Aspergillus hosts such as A nidulans and A niger Suitable host cells for the expression of glycosylated antι-ErbB2 antibody are derived from multicellular organisms Examples of invertebrate cells include plant and insect cells Numerous baculoviral strains and variants and corresponding permissive insect host cells from hosts such as Spodoptera frugφerda (caterpillar), Aedes aegypti (mosquito), Aedes albopictus (mosquito), Drosophila melanogaster (fruitfly), and Bombvx mori have been identified A variety of viral strains for transfection are publicly available, e g , the L-l variant of Autographa californica NPV and the Bm-5 strain of Bombyx mori NPV, and such viruses may be used as the virus herein according to the present invention, particularly for transfection of Spodoptera frugψerda cells Plant cell cultures of cotton, corn, potato, soybean, petunia, tomato, and tobacco can also be utilized as hosts However, interest has been greatest in vertebrate cells, and propagation of vertebrate cells in culture (tissue culture) has become a routine procedure Examples of useful mammalian host cell lines are monkey kidney CV 1 line transformed by SV40 (COS-7, ATCC CRL ' 651 ), human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture, Graham et al , J Gen Virol 36 59 (1977)), baby hamster kidney cells (BHK, ATCC CCL 10), Chinese hamster ovary cellsADHFR (CHO, Urlaub et al , Proc Natl Acad Sci USA 77 4216 (1980)), mouse sertoli cells (TM4, Mather, Bwl Reprod 23 243-251 (1980)), monkey kidney cells (CV1 ATCC CCL 70), African green monkey kidney cells (VERO-76, ATCC CRL- 1587), human cervical carcinoma cells (HELA, ATCC CCL 2), canine kidney cells (MDCK, ATCC CCL 34), buffalo rat liver cells (BRL 3A, ATCC CRL 1442), human lung cells (W138, ATCC CCL 75), human liver cells (Hep G2, HB 8065), mouse mammary tumor (MMT 060562, ATCC CCL51), TRI cells (Mather et ai , Annals N Y Acad Sci 383 44-68 (1982)), MRC 5 cells, FS4 cells, and a human hepatoma line (Hep G2) Host cells are transformed with the above-described expression or cloning vectors for antι-ErbB2 antibody production and cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences (viu) Cultunng the host cells The host cells used to produce the antι-ErbB2 antibody of this invention may be cultured in a variety of media Commercially available media such as Ham's F10 (Sigma), Minimal Essential Medium ((MEM), (Sigma), RPMI-1640 (Sigma), and Dulbecco's Modified Eagle's Medium ((DMEM), Sigma) are suitable for cultuπng the host cells In addition, any of the media described in Ham et al , Meth Enz 58 44 (1979), Barnes et al , Anal Biochem 102 255 (1980), U S Pat Nos 4,767,704, 4,657,866, 4,927,762, 4,560,655, or5, 122,469, WO 90/03430, WO 87/00195, or U S Patent Re 30,985 may be used as culture media for the host cells Any of these media may be supplemented as necessary with hormones and/or other growth factors (such as insulin, transfernn, or epidermal growth factor), salts (such as sodium chloride, calcium, magnesium, and phosphate), buffers (such as HEPES), nucleotides (such as adenosine and thymidine), antibiotics (such as GENTAMYCIN™ drug), trace elements (defined as inorganic compounds usually present at final concentrations in the micromolar range), and glucose or an equivalent energy source Any other necessary supplements may also be included at appropriate concentrations that would be known to those skilled in the art The culture conditions, such as temperature, pH, and the like, are those previously used with the host cell selected for expression, and will be apparent to the ordinarily skilled artisan (tx) Purification of antι-ErbB2 antibody When using recombinant techniques, the antibody can be produced intracellularly, in the peπplasmic space, or directly secreted into the medium If the antibody is produced intracellularly, as a first step, the paniculate debris, either host cells or lysed fragments, is removed, for example, by centrifugation or ultrafiltration Carter ef al , Bw/Technology 10 163-167 (1992) describe a procedure for isolating antibodies which are secreted to the peπplasmic space of E coli Briefly, cell paste is thawed in the presence of sodium acetate (pH 3 5), EDTA, and phenylmethylsulfonylfluoπde (PMSF) over about 30 min Cell debris can be removed by centrifugation Where the antibody is secreted into the medium, supernatants from such expression systems are generally first concentrated using a commercially available protein concentration filter, for example, an Amicon or Milhpore Pelhcon ultrafiltration unit A protease inhibitor such as PMSF may be included in any of the foregoing steps to inhibit proteolysis and antibiotics may be included to prevent the growth of adventitious contaminants The antibody composition prepared from the cells can be purified using, for example, hydroxylapatite chromatography, gel electrophoresis, dialysis, and affinity chromatography, with affinity chromatography being the preferred purification technique The suitability of protein A as an affinity ligand depends on the species and isotype of any immunoglobulin Fc domain that is present in the antibody Protein A can be used to purify antibodies that are based on human γl , γ2, or γ4 heavy chains (Lindmark et al , J Immunol Meth 62 1 -13 (1983)) Protein G is recommended for all mouse isotypes and for human γ3 (Guss et al , EMBO J 5 15671575 (1986)) The matrix to which the affinity ligand is attached is most often agarose, but other matrices are available Mechanically stable matrices such as controlled pore glass or poly(styrenedιvιnyl)benzene allow for faster flow rates and shorter processing times than can be achieved with agarose Where the antibody comprises a C H 3 domain, the Bakerbond ABX™resιn (J T Baker, Philhpsburg, NJ) is useful for purification Other techniques for protein purification such as fractionation on an ion-exchange column, ethanol precipitation, Reverse Phase HPLC, chromatography on silica, chromatography on heparin SEPHAROSE™ chromatography on an anion or cation exchange resm (such as a polyaspartic acid column), chromatofocusing, SDS-PAGE, and ammonium sulfate precipitation are also available depending on the antibody to be recovered Following any preliminary purification step(s), the mixture comprising the antibody of interest and contaminants may be subjected to low pH hydrophobic interaction chromatography using an elution buffer at a pH between about 2 5-4 5, preferably performed at low salt concentrations (e g ,from about 0-0 25M salt) IV. Pharmaceutical Formulations Therapeutic formulations of the antibodies used in accordance with the present invention are prepared for storage by mixing an antibody having the desired degree of purity with optional pharmaceutically acceptable carriers, excipients or stabilizers (Remington's Pharmaceutical Sciences 16th edition, Osol, A Ed (1980)), in the form of lyophihzed formulations or aqueous solutions Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include 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, hydrophihc polymers such as poly vinylpyrrohdone, amino acids such as glycine, glutamine, asparagine, histidine, arginine, or lysine, monosacchaπdes, disacchaπdes, and other carbohydrates including glucose, mannose, or dextπns, chelating agents such as EDTA, sugars such as sucrose, manmtol, trehalose or sorbitol, salt-forming counter-ions such as sodium, metal complexes (e g Zn-protein complexes), and/or non-ionic surfactants such as TWEEN™, PLURONICS™ or polyethylene glycol (PEG) Preferred lyophihzed antι-ErbB2 antibody formulations are described in WO 97/04801 , expressly incorporated herein by reference The formulation herein may also contain more than one active compound as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other For example, it may be desirable to further provide antibodies which bind to EGFR, ErbB2 (e g an antibody which binds a different epitope on ErbB2), ErbB3, ErbB4, or vascular endothelial factor (VEGF) in the one formulation Alternatively, or additionally, the composition may further comprise a chemotherapeutic agent, cytotoxic agent, cytokine, growth inhibitory agent, anti-hormonal agent, EGFR-targeted drug, anti-angiogenic agent, and/or cardioprotectant Such molecules are suitably present in combination in amounts that are effective for the purpose intended The active ingredients may also be entrapped in microcapsules prepared, for example, by coacervation techniques or by mterfacial 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 's Pharmaceutical Sciences 16th edition, Osol, A Ed (1980) Sustained-release preparations may be prepared Suitable examples of sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the antibody, which matrices are in the form of shaped articles, e g films, or microcapsules Examples of sustained-release matrices include polyesters, hydrogels (for example, poly(2-hydroxyethyl-methacrylate), or poly(vιnylalcohol)), polylactides (U S Pat No 3,773,919), copolymers of L-glutamic acid and γ ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradable lactic acid-glycohc acid copolymers such as the LUPRON DEPOT™ (injectable microspheres composed of lactic acid- glycohc acid copolymer and leuprohde acetate), and poly-D-(-)-3-hydroxybutyπc acid The formulations to be used for in vivo administration must be sterile This is readily accomplished by filtration through sterile filtration membranes. V. Treatment with the Anti-ErbB2 Antibodies It is contemplated that, according to the present invention, the antι-ErbB2 antibodies may be used to treat various diseases or disorders. Exemplary conditions or disorders include benign or malignant tumors, leukemias and lymphoid malignancies; other disorders such as neuronal, glial, astrocytal, hypothalamic, glandular, macrophagal, epithelial, stromal, blastocoehc, inflammatory, angiogenic and immunologic disorders Generally, the disease or disorder to be treated is cancer. Examples of cancer to be treated herein include, but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia or lymphoid malignancies More particular examples of such cancers include squamous cell cancer (e g epithelial squamous cell cancer), lung cancer including small-cell lung cancer, non-small cell lung cancer, adenocarcinoma of the lung and squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, ghoblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, rectal cancer, colorectal cancer, endometnal or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma, anal carcinoma, penile carcinoma, as well as head and neck cancer. The cancer will generally comprise ErbB2-expressιng cells, such that the antι-ErbB2 antibody herein is able to bind to the cancer While the cancer may be characterized by overexpression of the ErbB2 receptor, the present application further provides a method for treating cancer which is not considered to be an ErbB2-overexpressmg cancer. To determine ErbB2 expression in the cancer, various diagnostic/prognostic assays are available. In one embodiment, ErbB2 overexpression may be analyzed by IHC, e.g. using the HERCEPTEST® (Dako) Parrafin embedded tissue sections from a tumor biopsy may be subjected to the IHC assay and accorded a ErbB2 protein staining intensity criteria as follows Score 0 no staining is observed or membrane staining is observed in less than 10% of tumor cells Score 1 + a faint/barely perceptible membrane staining is detected in more than 10% of the tumor cells. The cells are only stained in part of their membrane. Score 2+ a weak to moderate complete membrane staining is observed in more than 10% of the tumor cells. Score 3+ a moderate to strong complete membrane staining is observed in more than 10% of the tumor cells. Those tumors with 0 or 1+ scores for ErbB2 overexpression assessment may be characterized as not overexpressing ErbB2, whereas those tumors with 2+ or 3+ scores may be characterized as overexpressing ErbB2 Alternatively, or additionally, FISH assays such as the INFORM™ (sold by Ventana, Arizona) or PATHVISION™ ( Vysis, Illinois) may be carried out on formalin-fixed, paraffin-embedded tumor tissue to determine the extent (if any) of ErbB2 overexpression in the tumor. In one embodiment, the cancer will be one which expresses (and may overexpress) EGFR Examples of cancers which may express/overexpress EGFR include squamous cell cancer (e g epithelial squamous cell cancer), lung cancer including small-cell lung cancer, non-small cell lung cancer, adenocarcinoma ofthe lung and squamous carcinoma of the lung, cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, ghoblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, rectal cancer, colorectal cancer, endometnal or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma, anal carcinoma, penile carcinoma, as well as head and neck cancer The cancer to be treated herein may be one characterized by excessive activation of an ErbB receptor, e g EGFR Such excessive activation may be attributable to overexpression or increased production of the ErbB receptor or an ErbB ligand In one embodiment ofthe invention, a diagnostic or prognostic assay will be performed to determine whether the patient's cancer is characterized by excessive activation of an ErbB receptor For example, ErbB gene amplification and/or overexpression of an ErbB receptor in the cancer may be determined Various assays for determining such amplification/overexpression are available in the art and include the IHC, FISH and shed antigen assays described above Alternatively, or additionally, levels of an ErbB ligand, such as TGF-α, in or associated with the tumor may be determined according to known procedures Such assays may detect protein and/or nucleic acid encoding it in the sample to be tested In one embodiment, ErbB ligand levels in the tumor may be determined using immunohistochemistry (IHC), see, for example, Scher ef α/ Clin Cancer Research 1 545-550 (1995) Alternatively, or additionally, one may evaluate levels of ErbB hgand-encoding nucleic acid in the sample to be tested, e g via FISH, southern blotting, or PCR techniques Moreover, ErbB receptor or ErbB ligand overexpression or amplification may be evaluated using an in vivo diagnostic assay, e g by administering a molecule (such as an antibody) which binds the molecule to be detected and is tagged with a detectable label (e g a radioactive isotope) and externally scanning the patient for localization of the label Where the cancer to be treated is hormone independent cancer, expression of the hormone (e g androgen) and/or its cognate receptor in the tumor may be assessed using any ofthe various assays available, e g as described above Alternatively, or additionally, the patient may be diagnosed as having hormone independent cancer in that they no longer respond to anti-androgen therapy In certain embodiments, an lmmunoconjugate comprising the antι-ErbB2 antibody conjugated with a cytotoxic agent is administered to the patient Preferably, the lmmunoconjugate and/or ErbB2 protein to which it is bound is/are internalized by the cell, resulting in increased therapeutic efficacy ofthe lmmunoconjugate in killing the cancer cell to which it binds In a preferred embodiment, the cytotoxic agent targets or interferes with nucleic acid in the cancer cell Examples of such cytotoxic agents include maytansinoids, cahcheamicins, πbonucleases and DNA endonucleases The antι-ErbB2 antibodies or immunoconjugates are administered to a human patient in accord with known methods, such as intravenous administration, e g , as a bolus or by continuous infusion over a period of time, by intramuscular, intraperitoneal, intracerobrospinal, subcutaneous, intra-articular, mtrasynovial, mtrathecal, oral, topical, or inhalation routes Intravenous or subcutaneous administration of the antibody is preferred Other therapeutic regimens may be combined with the administration of the antι-ErbB2 antibody The combined administration includes coadministration, using separate formulations or a single pharmaceutical formulation and consecutive administration in either order, wherein preferably there is a time period while both (or all) active agents simultaneously exert their biological activities In one preferred embodiment, the patient is treated with two different antι-ErbB2 antibodies For example, the patient may be treated with a first antι-ErbB2 antibody which blocks ligand activation of an ErbB receptor or an antibody having a biological characteristic of monoclonal antibody 2C4 as well as a second antι-ErbB2 antibody which is growth inhibitory (e g HERCEPTIN®) or an antι-ErbB2 antibody which induces apoptosis of an ErbB2- overexpressing cell (e g 7C2, 7F3 or humanized variants thereof) Preferably such combined therapy results in a synergistic therapeutic effect One may, for instance, treat the patient with HERCEPTIN® and thereafter treat with rhuMAb 2C4, e g where the patient does not respond to HERCEPTIN® therapy In another embodiment, the patient may first be treated with rhuMAb 2C4 and then receive HERCEPTIN® therapy In yet a further embodiment, the patient may be treated with both rhuMAb 2C4 and HERCEPTIN® simultaneously It may also be desirable to combine administration of the antι-ErbB2 antibody or antibodies, with administration of an antibody directed against another tumor associated antigen The other antibody in this case may, for example, bind to EGFR, ErbB3, ErbB4, or vascular endothelial growth factor (VEGF) In one embodiment, the treatment ofthe present invention involves the combined administration of an anti- ErbB2 antibody (or antibodies) and one or more chemotherapeutic agents or growth inhibitory agents, including coadministration of cocktails of different chemotherapeutic agents Preferred chemotherapeutic agents include taxanes (such as pachtaxel and docetaxel) and/or anthracychne antibiotics Preparation and dosing schedules for such chemotherapeutic agents may be used according to manufacturers' instructions or as determined empirically by the skilled practitioner Preparation and dosing schedules for such chemotherapy are also described in Chemotherapy Service Ed , M C Perry, Williams & Wilkins, Baltimore, MD (1992) The antibody may be combined with an anti-hormonal compound, e g , an anti-estrogen compound such as tamoxifen, an anti-progesterone such as onapπstone (see, EP 616 812), or an anti-androgen such as flutamide, in dosages known for such molecules Where the cancer to be treated is hormone independent cancer, the patient may previously have been subjected to anti-hormonal therapy and, after the cancer becomes hormone independent, the antι-ErbB2 antibody (and optionally other agents as described herein) may be administered to the patient Sometimes, it may be beneficial to also coadmmister a cardioprotectant (to prevent or reduce myocardial dysfunction associated with the therapy) or one or more cytokines to the patient One may also coadmmister an EGFR- targeted drug or an anti-angiogenic agent In addition to the above therapeutic regimes, the patient may be subjected to surgical removal of cancer cells and/or radiation therapy The antι-ErbB2 antibodies herein may also be combined with an EGFR-targeted drug such as those discussed above in the definitions section resulting in a complementary, and potentially synergistic, therapeutic effect Suitable dosages for any of the above coadministered agents are those presently used and may be lowered due to the combined action (synergy) of the agent and antι-ErbB2 antibody For the prevention or treatment of disease, the appropriate dosage of antibody will depend on the type of disease to be treated, as defined above, the severity and course of the disease, whether the antibody is administered for preventive or therapeutic purposes, previous therapy, the patient's clinical history and response to the antibody, and the discretion of the attending physician The antibody 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- 20mg kg) of antibody is an initial candidate dosage for administration to the patient, whether, for example, by one or more separate administrations, or by continuous infusion A 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 is sustained until a desired suppression of disease symptoms occurs The preferred dosage of the antibody will be in the range from about 0 05mg/kg to about 1 Omg/kg Thus, one or more doses of about 0 5 mg kg, 2 Omg/kg, 4 Omg/kg or 1 Omg/kg (or any combination thereof) may be administered to the patient Such doses may be administered intermittently, e g every week or every three weeks (e g such that the patient receives from about two to about twenty, e g about six doses of the antι-ErbB2 antibody) An initial higher loading dose, followed by one or more lower doses may be administered An exemplary dosing regimen comprises administering an initial loading dose of about 4 mg/kg, followed by a weekly maintenance dose of about 2 mg/kg of the antι-ErbB2 antibody However, other dosage regimens may be useful The progress of this therapy is easily monitored by conventional techniques and assays Aside from administration of the antibody protein to the patient, the present application contemplates administration of the antibody by gene therapy Such administration of nucleic acid encoding the antibody is encompassed by the expression "administering a therapeutically effective amount of an antibody" See, for example, WO96/07321 published March 14, 1996 concerning the use of gene therapy to generate mtracellular antibodies There are two major approaches to getting the nucleic acid (optionally contained in a vector) into the patient's cells, in vivo and ex vivo For in vivo delivery the nucleic acid is injected directly into the patient, usually at the site where the antibody is required For ex vivo treatment, the patient's cells are removed, the nucleic acid is introduced into these isolated cells and the modified cells are administered to the patient either directly or, for example, encapsulated within porous membranes which are implanted into the patient (see, e g U S Patent Nos 4,892,538 and 5,283, 187) There are a variety of techniques available for introducing nucleic acids into viable cells The techniques vary depending upon whether the nucleic acid is transferred into cultured cells in vitro, or in vivo in the cells ofthe intended host Techniques suitable for the transfer of nucleic acid into mammalian cells in vitro include the use of liposomes, electroporation, microinjection, cell fusion, DEAE-dextran, the calcium phosphate precipitation method, etc A commonly used vector for ex vivo delivery of the gene is a retrovirus The currently preferred in vivo nucleic acid transfer techniques include transfection with viral vectors (such as adenovirus, Herpes simplex I virus, or adeno-associated virus) and hpid-based systems (useful lipids for hpid- mediated transfer ofthe gene are DOTMA, DOPE and DC-Choi, for example) In some situations it is desirable to provide the nucleic acid source with an agent that targets the target cells, such as an antibody specific for a cell surface membrane protein or the target cell, a ligand for a receptor on the target cell, etc Where liposomes are employed, proteins which bind to a cell surface membrane protein associated with endocytosis may be used for targeting and/or to facilitate uptake, e g capsid proteins or fragments thereof tropic for a particular cell type, antibodies for proteins which undergo mternalization in cycling, and proteins that target mtracellular localization and enhance mtracellular half-life The technique of receptor-mediated endocytosis is described, for example, by Wu ef al , J Bwl Chem 262 4429-4432 (1987), and Wagner ef al , Proc Natl Acad Set USA 87 3410-3414 (1990) For review of the currently known gene marking and gene therapy protocols see Anderson et al , Science 256 808-813 (1992) See also WO 93/25673 and the references cited therein VI. Articles of Manufacture In another embodiment of the invention, an article of manufacture containing materials useful for the treatment ofthe disorders described above is provided The article of manufacture comprises a container and a label or package insert on or associated with the container Suitable containers include, for example, bottles, vials, syringes, etc The containers may be formed from a variety of materials such as glass or plastic The container holds a composition which is effective for treating 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 pierceable by a hypodermic injection needle) At least one active agent in the composition is an antι-ErbB2 antibody The label or package insert indicates that the composition is used for treating the condition of choice, such as cancer In one embodiment, the label or package inserts indicates that the composition comprising the antibody which binds ErbB2 can be used to treat cancer which expresses an ErbB receptor selected from the group consisting of epidermal growth factor receptor (EGFR), ErbB3 and ErbB4, preferably EGFR In addition, the label or package insert may indicate that the patient to be treated is one having cancer characterized by excessive activation of an ErbB receptor selected from EGFR, ErbB3 or ErbB4 For example, the cancer may be one which overexpresses one of these receptors and/or which overexpresses an ErbB ligand (such as TGF-α) The label or package insert may also indicate that the composition can be used to treat cancer, wherein the cancer is not characterized by overexpression of the ErbB2 receptor For example, whereas the present package insert for HERCEPTIN® indicates that the antibody is used to treat patients with metastatic breast cancer whose tumors overexpress the ErbB2 protein, the package insert herein may indicate that the antibody or composition is used to treat cancer regardless of the extent of ErbB2 overexpression In other embodiments, the package insert may indicate that the antibody or composition can be used to treat breast cancer (e g metastatic breast cancer), hormone independent cancer, prostate cancer, (e g androgen independent prostate cancer), lung cancer (e g non-small cell lung cancer), colon, rectal or colorectal cancer, or any of the other diseases or disorders disclosed herein Moreover, the article of manufacture may comprise (a) a first container with a composition contained therein, wherein the composition comprises a first antibody which binds ErbB2 and inhibits growth of cancer cells which overexpress ErbB2, and (b) a second container with a composition contained therein, wherein the composition comprises a second antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor The article of manufacture in this embodiment ofthe invention may further comprises a package insert indicating that the first and second antibody compositions can be used to treat cancer Moreover, the package insert may instruct the user of the composition (comprising an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor) to combine therapy with the antibody and any of the adjunct therapies described in the preceding section (e g a chemotherapeutic agent, an EGFR-targeted drug, an anti-angiogenic agent, an anti-hormonal compound, a cardioprotectant and/or a cytokine) Alternatively, or additionally, the article of manufacture may further comprise a second (or third) container comprising a pharmaceutically-acceptable buffer, such as bacteriostatic water for injection (BWFI), phosphate-buffered saline, Ringer'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 VII. Non-therapeutic Uses for the Anti-ErbB2 Antibody The antibodies (e g the humanized antι-ErbB2 antibodies) of the invention have further non-therapeutic applications For example, the antibodies may be used as affinity purification agents In this process, the antibodies are immobilized on a solid phase such a Sephadex resin or filter paper, using methods well known in the art The immobilized antibody is contacted with a sample containing the ErbB2 protein (or fragment thereof) to be purified, and thereafter the support is washed with a suitable solvent that will remove substantially all the material in the sample except the ErbB2 protein, which is bound to the immobilized antibody Finally, the support is washed with another suitable solvent, such as glycine buffer, pH 5 0, that will release the ErbB2 protein from the antibody Antι-ErbB2 antibodies may also be useful in diagnostic assays for ErbB2 protein, e g detecting its expression in specific cells, tissues, or serum For diagnostic applications, the antibody typically will be labeled with a detectable moiety Numerous labels are available which can be generally grouped into the following categories 35 14 125 3 131 (a) Radioisotopes, such as S, C, I, H, and I The antibody can be labeled with the radioisotope using the techniques described in Current Protocols in Immunology , Volumes 1 and 2, Cohgen ef al Ed Wiley- Interscience, New York, New York Pubs (1991 ) for example and radioactivity can be measured using scintillation counting (b) Fluorescent labels such as rare earth chelates (europium chelates) or fluorescein and its derivatives, rhodamine and its derivatives, dansyl, Lissamine, phycoerythπn and Texas Red are available The fluorescent labels can be conjugated to the antibody using the techniques disclosed in Current Protocols in Immunology , supra, for example Fluorescence can be quantified using a fluoπmeter (c) Various enzyme-substrate labels are available and U S Patent No 4,275,149 provides a review of some of these The enzyme generally catalyzes a chemical alteration ofthe chromogenic substrate which can be measured using various techniques For example, the enzyme may catalyze a color change in a substrate, which can be measured spectrophotometπcally Alternatively, the enzyme may alter the fluorescence or chemiluminescence ofthe substrate Techniques for quantifying a change in fluorescence are described above The chemiluminescent substrate becomes electronically excited by a chemical reaction and may then emit light which can be measured (using a chemiluminometer, for example) or donates energy to a fluorescent acceptor Examples of enzymatic labels include luciferases (e g firefly luciferase and bacterial luciferase, U S Patent No 4,737,456), lucifeπn, 2,3- dihydrophthalazinediones, malate dehydrogenase, urease, peroxidase such as horseradish peroxidase (HRPO), alkaline phosphatase, β-galactosidase, glucoamylase, lysozyme, saccharide oxidases (e g , glucose oxidase, galactose oxidase, and glucose-6-phosphate dehydrogenase), heterocyclic oxidases (such as uncase and xanthine oxidase), lactoperoxidase, microperoxidase, and the like Techniques for conjugating enzymes to antibodies are described in CSulhvan ef al Methods for the Preparation of Enzyme-Antibody Conjugates for use in Enzyme Immunoassay, in Methods in Enzym (ed J Langone & H Van Vunakis), Academic press, New York, 73 147-166 (1981 ) Examples of enzyme-substrate combinations include, for example (0 Horseradish peroxidase (HRPO) with hydrogen peroxidase as a substrate, wherein the hydrogen peroxidase oxidizes a dye precursor (e g , orthophenylene diamine (OPD) or 3,3',5,5'-tetramethyl benzidme hydrochloπde (TMB)), (n) alkaline phosphatase (AP) with para-Nitrophenyl phosphate as chromogenic substrate, and (in) β-D-galactosidase (β-D-Gal) with a chromogenic substrate (e g , p-nitrophenyl-β-D-galactosidase) or fluorogemc substrate 4-methylumbellιferyl-β-D-galactosιdase Numerous other enzyme-substrate combinations are available to those skilled in the art For a general review of these, see U S Patent Nos 4,275,149 and 4,318,980 Sometimes, the label is indirectly conjugated with the antibody The skilled artisan will be aware of various techniques for achieving this For example, the antibody can be conjugated with biotin and any of the three broad categories of labels mentioned above can be conjugated with avidin, or vice versa Biotin binds selectively to avidin and thus, the label can be conjugated with the antibody in this indirect manner Alternatively, to achieve indirect conjugation ofthe label with the antibody, the antibody is conjugated with a small hapten (e g , digoxin) and one of the different types of labels mentioned above is conjugated with an anti-hapten antibody (e g , anti-digoxin antibody) Thus, indirect conjugation of the label with the antibody can be achieved In another embodiment of the invention, the antι-ErbB2 antibody need not be labeled, and the presence thereof can be detected using a labeled antibody which binds to the ErbB2 antibody The antibodies of the present invention may be employed in any known assay method, such as competitive binding assays, direct and indirect sandwich assays, and lmmunoprecipitation assays Zola, Monoclonal Antibodies A Manual of Techniques, pp 147-158 (CRC Press, Inc 1987) For immunohistochemistry, the tumor sample may be fresh or frozen or may be embedded in paraffin and fixed with a preservative such as formalin, for example The antibodies may also be used for in vivo diagnostic assays Generally, the antibody is labeled with a radio 111 99 14 131 125 3 32 35 nuchde (such as In, Tc, C, I, I, H, P or S) so that the tumor can be localized using immunoscintiography As a matter of convenience, the antibodies of the present invention can be provided in a kit, i e , a packaged combination of reagents in predetermined amounts with instructions for performing the diagnostic assay Where the antibody is labeled with an enzyme, the kit will include substrates and cofactors required by the enzyme (e g , a substrate precursor which provides the detectable chromophore or fluorophore) In addition, other additives may be included such as stabilizers, buffers (e g , a block buffer or lysis buffer) and the like The relative amounts of the various reagents may be varied widely to provide for concentrations in solution of the reagents which substantially optimize the sensitivity of the assay Particularly, the reagents may be provided as dry powders, usually lyophihzed, including excipients which on dissolution will provide a reagent solution having the appropriate concentration VIII. Deposit of Materials The following hybndoma cell lines have been deposited with the American Type Culture Collection, 10801 University Boulevard, Manassas, VA 201 10-2209, USA (ATCC) Antibody Designation ATCC No. Deposit Date 7C2 ATCC HB- 12215 October 17, 1996 7F3 ATCC HB-12216 October 17, 1996 4D5 ATCC CRL 10463 May 24, 1990 2C4 ATCC HB-12697 April 8, 1999 Further details ofthe invention are illustrated by the following non-hmitmg Examples The disclosures of all citations in the specification are expressly incorporated herein by reference Example 1 Production and Characterization of Monoclonal Antibody 2C4 The murine monoclonal antibodies 2C4, 7F3 and 4D5 which specifically bind the extracellular domain of ErbB2 were produced as described in Fendly ef al , Cancer Research 50 1550-1558 (1990) Briefly, NIH 3T3/HER2-3 40Q cells (expressing approximately 1 x 10 ErbB2 molecules/cell) produced as described in Hudziak et al Proc Natl Acad Sci (USA) 84 7158-7163 (1987) were harvested with phosphate buffered saline (PBS) η containing 25mM EDTA and used to immunize BALB/c mice The mice were given injections l p of 10 cells in 32 0 5ml PBS on weeks 0, 2, 5 and 7 The mice with antisera that immunoprecipitated P-labeled ErbB2 were given 1 p injections of a wheat germ agglutinin-Sepharose (WGA) purified ErbB2 membrane extract on weeks 9 and 13 This was followed by an l v injection of 0 1 ml ofthe ErbB2 preparation and the splenocytes were fused with mouse myeloma line X63-Ag8 653 Hybndoma supernatants were screened for ErbB2-bιndιng by ELISA and radioimmunoprecipitation The ErbB2 epitopes bound by monoclonal antibodies 4D5, 7F3 and 2C4 were determined by competitive binding analysis (Fendly ef al Cancer Research 50 1550-1558 (1990)) Cross-blocking studies were done on antibodies by direct fluorescence on intact cells using the PANDEX™ Screen Machine to quantitate fluorescence Each monoclonal antibody was conjugated with fluorescein isothiocyanate (FITC), using established procedures (Wofsy et al Selected Methods in Cellular Immunology, p 287, Mishel and Schngi (eds ) San Francisco W J Freeman Co (1980)) Confluent monolayers of NIH 3T3/HER2-3 400 cells were trypsinized, washed once, and resuspended at 1 75 x 10 cell/ml in cold PBS containing 0 5% bovine serum albumin (BSA) and 0 1% NaN 3 A final concentration of 1 % latex particles (IDC, Portland, OR) was added to reduce clogging of the PANDEX™ plate membranes Cells in suspension, 20 μl, and 20 μl of purified monoclonal antibodies (lOOμg/ml to 0 1 μg/ml) were added to the PANDEX™ plate wells and incubated on ice for 30 minutes A predetermined dilution of FITC- labeled monoclonal antibodies in 20 μl was added to each well, incubated for 30 minutes, washed, and the fluorescence was quantitated by the PANDEX™ Monoclonal antibodies were considered to share an epitope if each blocked binding of the other by 50% or greater in comparison to an irrelevant monoclonal antibody control In this experiment, monoclonal antibodies 4D5, 7F3 and 2C4 were assigned epitopes I, G/F and F, respectively The growth inhibitory characteristics of monoclonal antibodies 2C4, 7F3 and 4D5 were evaluated using the breast tumor cell line, SK-BR-3 (see Hudziak etai Molec Cell Bwl 9(3) 1 165-1 172 (1989)) Briefly, SK-BR-3 cells were detached by using 0 25% (vol/vol) trypsin and suspended in complete medium at a density of 4 x 10 4 cells per ml Ahquots of 100 μl (4 x 10 cells) were plated into 96-well microdilution plates, the cells were allowed to adhere, and 100 μl of media alone or media containing monoclonal antibody (final concentration 5 μg/ml) was then added After 72 hours, plates were washed twice with PBS (pH 7 5), stained with crystal violet (0 5% in methanol), and analyzed for relative cell proliferation as described in Sugarman ef al Science 230 943-945 (1985) Monoclonal antibodies 2C4 and 7F3 inhibited SK-BR-3 relative cell proliferation by about 20% and about 38%, respectively, compared to about 56% inhibition achieved with monoclonal antibody 4D5 Monoclonal antibodies 2C4, 4D5 and 7F3 were evaluated for their ability to inhibit HRG-stimulated tyrosine phosphorylation of proteins in the M τ 180,000 range from whole-cell lysates of MCF7 cells (Lewis ef al Cancer Research 56 1457-1465 (1996)) MCF7 cells are reported to express all known ErbB receptors, but at relatively low levels Since ErbB2, ErbB3, and ErbB4 have nearly identical molecular sizes, it is not possible to discern which protein is becoming tyrosine phosphorylated when whole-cell lysates are evaluated by Western blot analysis However, these cells are ideal for HRG tyrosine phosphorylation assays because under the assay conditions used, in the absence of exogenously added HRG, they exhibit low to undetectable levels of tyrosine phosphorylation proteins in the M r 180,000 range MCF7 cells were plated in 24-well plates and monoclonal antibodies to ErbB2 were added to each well and incubated for 30 minutes at room temperature, then rHRGβl ] 77-244 was added to each well to a final concentration of 0 2 nM, and the incubation was continued for 8 minutes Media was carefully aspirated from each well, and reactions were stopped by the addition of 100 μl of SDS sample buffer (5% SDS, 25 mM DTT, and 25 mM Tπs-HCl, pH 6 8) Each sample (25 μl) was electrophoresed on a 4-12% gradient gel (Novex) and then electrophoretically transferred to polyvmylidene difluoπde membrane Antiphosphotyrosine (4G10, from UBI, used at 1 μg/ml) immunoblots were developed, and the intensity of the predominant reactive band at M, ~ 180,000 was quantified by reflectance densitometry, as described previously (Holmes et ai Science 256 1205-1210 (1992), Shwkowski et al J Bwl Chem 269 14661-14665 (1994)) Monoclonal antibodies 2C4, 7F3, and 4D5, significantly inhibited the generation of a HRG-induced tyrosine phosphorylation signal at M r 180,000 In the absence of HRG, none of these antibodies were able to stimulate tyrosine phosphorylation of proteins in the M τ 180,000 range Also, these antibodies do not cross-react with EGFR (Fendly et al Cancer Research 50 1550-1558 (1990)), ErbB3, or ErbB4 Antibodies 2C4 and 7F3 significantly inhibited HRG stimulation of pi 80 tyrosine phosphorylation to <25% of control Monoclonal antibody 4D5 was able to block HRG stimulation of tyrosine phosphorylation by -50% Fig 2A shows dose- response curves for 2C4 or 7F3 inhibition of HRG stimulation of pi 80 tyrosine phosphorylation as determined by reflectance densitometry Evaluation of these inhibition curves using a 4-parameter fit yielded an IC 50 of 2 8 ± 0 7 nM and 29 0 ± 4 1 nM for 2C4 and 7F3, respectively Inhibition of HRG binding to MCF7 breast tumor cell lines by antι-ErbB2 antibodies was performed with monolayer cultures on ice in a 24- well-plate format (Lewis et al Cancer Research 56 1457-1465 (1996)) Anti- 125 ErbB2 monoclonal antibodies were added to each well and incubated for 30 minutes I-labeled rHRGβl j yy 224 (25 pm) was added, and the incubation was continued for 4 to 16 hours Fig 2B provides dose-response curves for 2C4 or 7F3 inhibition of HRG binding to MCF7 cells Varying concentrations of 2C4 or 7F3 were incubated with 125 MCF7 cells in the presence of I-labeled rHRGβl, and the inhibition curves are shown in Fig 2B Analysis of these data yielded an IC 5() of 2 4 ± 0 3 nM and 19 0 ± 7 3 nM for 2C4 and 7F3, respectively A maximum inhibition of -74% for 2C4 and 7F3 were in agreement with the tyrosine phosphorylation data To determine whether the effect of the antι-ErbB2 antibodies observed on MCF7 cells was a general 125 phenomenon, human tumor cell lines were incubated with 2C4 or 7F3 and the degree of specific I-labeled rHRGβl binding was determined (Lewis ef al Cancer Research 56 1457 1465 (1996)) The results from this study 121 are shown in Fig 3 Binding of I-labeled rHRGβl could be significantly inhibited by either 2C4 or 7F3 m ail cell lines, with the exception of the breast cancer cell line MDA-MB-468, which has been reported to express little or no ErbB2 The remaining cell lines are reported to express ErbB2, with the level of ErbB2 expression varying widely among these cell lines In fact, the range of ErbB2 expression in the cell lines tested vanes by more than 2 4 orders of magnitude For example, BT-20, MCF7, and Caov3 express ~ 10 ErbB2 receptors/cell, whereas BT-474 and SK-BR-3 express ~ 10 ErbB2 receptors/cell Given the wide range of ErbB2 expression in these cells and the data above, it was concluded that the interaction between ErbB2 and ErbB3 or ErbB4, was itself a high-affinity interaction that takes place on the surface of the plasma membrane The growth inhibitory effects of monoclonal antibodies 2C4 and 4D5 on MDA-MB-175 and SK-BR-3 cells in the presence or absence of exogenous rHRGβl was assessed (Schaefer ef al Oncogene 15 1385-1394 (1997)) ErbB2 levels in MDA-MB-175 cells are 4-6 times higher than the level found in normal breast epithelial cells and the ErbB2-ErbB4 receptor is constitutively tyrosine phosphorylated in MDA-MB-175 cells MDA-MB-175 cells were treated with an antι-ErbB2 monoclonal antibodies 2C4 and 4D5 (lOμg/mL) for 4 days In a crystal violet staining assay, incubation with 2C4 showed a strong growth inhibitory effect on this cell line (Fig 4A) Exogenous HRG did not significantly reverse this inhibition On the other hand 2C4 revealed no inhibitory effect on the ErbB2 overexpressing cell line SK-BR-3 (Fig 4B) Monoclonal antibody 2C4 was able to inhibit cell proliferation of MDA-MB-175 cells to a greater extent than monoclonal antibody 4D5, both in the presence and absence of exogenous HRG Inhibition of cell proliferation by 4D5 is dependent on the ErbB2 expression level (Lewis ef al Cancer Immunol Immunother 37 255-263 (1993)) A maximum inhibition of 66% in SK-BR-3 cells could be detected (Fig 4B) However this effect could be overcome by exogenous HRG Example 2 HRG Dependent Association of ErbB2 with ErbB3 is Blocked by Monoclonal Antibody 2C4 The ability of ErbB3 to associate with ErbB2 was tested in a co-immunoprecipitation experiment 1 0 x 10 MCF7 or SK-BR-3 cells were seeded in six well tissue culture plates in 50 50 DMEM/Ham's F12 medium containing 10% fetal bovine serum (FBS) and 10 mM HEPES, pH 7 2 (growth medium), and allowed to attach overnight The cells were starved for two hours in growth medium without serum prior to beginning the experiment The cells were washed briefly with phosphate buffered saline (PBS) and then incubated with either 100 nM of the indicated antibody diluted in 0 2% w/v bovine serum albumin (BSA), RPMI medium, with 10 mM HEPES, pH 7 2 (binding buffer), or with binding buffer alone (control) After one hour at room temperature, HRG was added to a final concentration of 5 nM to half the wells (+) A similar volume of binding buffer was added to the other wells (-) The incubation was continued for approximately 10 minutes Supernatants were removed by aspiration and the cells were lysed in RPMI, 10 mM HEPES, pH 7 2, 1 0% v/v TRITON X-100™, 1 0% w/v CHAPS (lysis buffer), containing 0 2 mM PMSF, 10 μg/ml leupeptin, and 10 TU/ml aprotinin The lysates were cleared of insoluble material by centrifugation ErbB2 was immunoprecipitated using a monoclonal antibody covalently coupled to an affinity gel ( Affi-Prep 10, Bio-Rad) This antibody (Ab-3, Oncogene Sciences) recognizes a cytoplasmic domain epitope Immunoprecipitation was performed by adding 10 μl of gel slurry containing approximately 8 5 μg of immobilized antibody to each lysate, and the samples were allowed to mix at room temperature for two hours The gels were then collected by centrifugation The gels were washed batchwise three times with lysis buffer to remove unbound material SDS sample buffer was then added and the samples were heated briefly in a boiling water bath Supernatants were run on 4-12% polyacrylamide gels and electroblotted onto nitrocellulose membranes The presence of ErbB 3 was assessed by probing the blots with a polyclonal antibody against a cytoplasmic domain epitope thereof (c-17, Santa Cruz Biotech) The blots were visualized using a chemiluminescent substrate (ECL, Amersham) As shown in the control lanes of Figs 5A and 5B, for MCF7 and SK-BR-3 cells, respectively, ErbB3 was present in an ErbB2 immunoprecipitate only when the cells were stimulated with HRG If the cells were first incubated with monoclonal antibody 2C4, the ErbB3 signal was abolished in MCF7 cells (Fig 5A, lane 2C4 +) or substantially reduced in SK-BR-3 cells (Fig 5B, lane 2C4+) As shown in Figs 5A-B, monoclonal antibody 2C4 blocks heregulin dependent association of ErbB3 with ErbB2 in both MCF7 and SK-BR-3 cells substantially more effectively than HERCEPTIN® Preincubation with HERCEPTIN® decreased the ErbB3 signal in MCF7 lysates but had little or no effect on the amount of ErbB3 co-precipitated from SK-BR-3 lysates Preincubation with an antibody against the EGF receptor (Ab-1 , Oncogene Sciences) had no effect on the ability of ErbB3 to co- lmmunoprecipitate with ErbB2 in either cell line Example 3 Humanized 2C4 Antibodies The variable domains of murine monoclonal antibody 2C4 were first cloned into a vector which allows production of a mouse/human chimeπc Fab fragment Total RNA was isolated from the hybndoma cells using a Stratagene RNA extraction kit following manufacturer s protocols The variable domains were amplified by RT- PCR, gel purified, and inserted into a derivative of a pUCl 19-based plasmid containing a human kappa constant domain and human C H 1 domain as previously described (Carter etai PNAS (USA) 89 4285 (1992), and U S Patent No 5,821 ,337) The resultant plasmid was transformed into £ coli strain 16C9 for expression of the Fab fragment Growth of cultures, induction of protein expression, and purification of Fab fragment were as previously described (Werther e α/ J Immunol 157 4986-4995 (1996), Presta et ai Cancer Research 57 4593-4599 ( 1997)) Purified chimeπc 2C4 Fab fragment was compared to the muπne parent antibody 2C4 with respect to its 125 ability to inhibit I-HRG binding to MCF7 cells and inhibit rHRG activation of pi 80 tyrosine phosphorylation in MCF7 cells As shown in Fig 6A, the chimeπc 2C4 Fab fragment is very effective in disrupting the formation of the high affinity ErbB2-ErbB3 binding site on the human breast cancer cell line, MCF7 The relative IC 50 value calculated for intact murine 2C4 is 4 0 ± 0 4nM, whereas the value for the Fab fragment is 7 7 ± 1 I nM As illustrated in Fig 6B, the monovalent chimeπc 2C4 Fab fragment is very effective in disrupting HRG-dependent ErbB2-ErbB3 activation The IC 50 value calculated for intact muπne monoclonal antibody 2C4 is 6 0 ± 2nM, whereas the value for the Fab fragment is 15 0 ± 2nM DNA sequencing ofthe chimeπc clone allowed identification of the CDR residues (Kabat ef al , Sequences of Proteins of Immunologtcal Interest, 5 th Ed Public Health Service, National Institutes of Health, Bethesda, MD ( 1991 )) (Figs 7A and B) Using oligonucleotide site-directed mutagenesis, all six of these CDR regions were introduced into a complete human framework (V L kappa subgroup I and V H subgroup III) contained on plasmid VX4 as previously described (Presta et al , Cancer Research 57 4593-4599 (1997)) Protein from the resultant "CDR-swap' was expressed and purified as above Binding studies were performed to compare the two versions Briefly, a NUNC MAXISORP™ plate was coated with 1 microgram per ml of ErbB 2 extracellular domain (ECD, produced as described in WO 90/14357) in 50 mM carbonate buffer, pH 9 6, overnight at 4°C, and then blocked with ELISA diluent (0 5% BSA, 0 05% polysorbate 20, PBS) at room temperature for 1 hour Seπal dilutions of samples in ELISA diluent were incubated on the plates for 2 hours After washing, bound Fab fragment was detected with biotinylated murine anti-human kappa antibody (ICN 634771) followed by streptavidin-conjugated horseradish peroxidase (Sigma) and using 3,3',5,5'-tetramethyl benzidme (Kirkegaard & Perry Laboratories, Gaithersburg, MD) as substrate Absorbance was read at 450 nm As shown in Fig 8A, all binding was lost on construction of the CDR-swap human Fab fragment To restore binding of the humanized Fab, mutants were constructed using DNA from the CDR-swap as template Using a computer generated model (Fig 9), these mutations were designed to change human framework region residues to their murine counterparts at positions where the change might affect CDR conformations or the antibody-antigen interface Mutants are shown in Table 2 Table 2 Designation of Humanized 2C4 FR Mutations Binding curves for the various mutants are shown in Figs 8A-C Humanized Fab version 574, with the changes ArgH71 Val, AspH73Arg and IleH69Leu, appears to have binding restored to that of the original chimeπc 2C4 Fab fragment Additional FR and/or CDR residues, such as L2, L54, L55, L56, H35 and/or H48, may be modified (e g substituted as follows - IleL2Thr, ArgL54Leu, TyrL55Glu, ThrL56Ser, AspH35Ser, and ValH48Ile) in order to further refine or enhance binding of the humanized antibody Alternatively, or additionally, the humanized antibody may be affinity matured (see above) in order to further improve or refine its affinity and/or other biological activities Humanized 2C4 version 574 was affinity matured using a phage-display method Briefly, humanized 2C4 574 Fab was cloned into a phage display vector as a genelll fusion When phage particles are induced by infection with M13K07 helper phage, this fusion allows the Fab to be displayed on the N-terminus ofthe phage tail- fiber protein, genelll (Baca et al J Bwl Chem 272 10678 (1997)) Individual libraries were constructed for each ofthe 6 CDRs identified above In these libraries, the amino acids in the CDRs which were identified using a computer generated model (Fig 9) as being potentially significant in binding to ErbB2 were randomized using ohgos containing "NNS" as their codons The libraries were then panned against ErbB2 ECD coated on NUNC MAXISORP™ plates with 3% dry milk in PBS with 0 2% TWEEN 20® (MPBST) used in place of all blocking solutions In order to select for phage with affinities higher than that of 2C4 574, in panning rounds 3, 4, and 5, soluble ErbB2 ECD or soluble Fab 2C4 574 was added during the wash steps as competitor Wash times were extended to 1 hour at room temperature After 5 rounds of panning, individual clones were again analyzed by phage-ELISA Individual clones were grown in Costar 96-well U-bottomed tissue culture plates, and phage were induced by addition of helper phage After overnight growth, E coli cells were pelleted, and the phage containing supernates were transfered to 96-well plates where the phage were blocked with MPBST for 1 hr at room temperature NUNC MAXISORP™ plates coated with ErbB2 ECD were also blocked with MPBST as above Blocked phage were incubated on the plates for 2 hours After washing, bound phage were detected using horseradish-peroxidase-conj ugated anti-M 13 monoclonal antibody (Amersham Pharmacia Biotech, Inc 27-9421 -01 ) diluted 1 5000 in MPBST, followed by 3,3',5,5',- tetramethyl benzidme as substrate Absorbance was read at 450 nm The 48 clones from each library which gave the highest signals were DNA sequenced Those clones whose sequences occurred the most frequently were subcloned into the vector described above which allows expression of soluble Fabs These Fabs were induced, proteins purified and the purified Fabs were analyzed for binding by ELISA as described above and the binding was compared to that of the starting humanized 2C4 574 version After interesting mutations in individual CDRs were identified, additional mutants which were various combinations of these were constructed and tested as above Mutants which gave improved binding relative to 574 are described in Table 3 Table 3 Designation of mutants derived from affinity maturation of 2C4.574 Mutant Name Change from 574 Mutant/574* H3 A1 serH99trp, metH341eu 0 380 L2 F5 serL50trp, tyrL53gly, metH341eu 0 087 HI 3 B3 thrH28gln,thrH30ser, metH341eu 0 572 L3 G6 tyrL92pro, ιleL931ys, metH341eu 0 569 L3 G1 1 tyrL92ser, ιleL93arg, tyrL94gly, metH341eu 0 561 L3 29 tyrL92phe, tyrL96asn, metH341eu 0 552 L3 36 tyrL92phe, tyrL941eu, tyrL96pro, metH341eu 0 215 654 serL50trp, metH341eu 0 176 655 metH34ser 0 542 659 serL50trp, metH34ser 0 076 L2 F5 H3 A1 serL50trp, tyrL53gly, metH341eu, serH99trp 0 175 L3G6 H3 Al tyrL92pro, ιleL931ys, metH341eu, serH99trp 0 218 HI 3 B3 H3 A1 thrH28gln, thrH30ser, metH341eu, serH99trp 0 306 L3 G1 1 H3 A1 tyrL92ser, ιleL93arg, tyrL94gly, metH341eu, serH99trp 0 248 654 H3 A1 serL50trp, metH341eu, serH99trp 0 133 654 L3 G6 serL50trp, metH341eu, tyrL92pro, ιleL931ys 0 213 654 L3 29 serL50trp, metH341eu, tyrL92phe, tyrL96asn 0 236 654 L3 36 serL50trp, metH351eu, tyrL92phe, tyrL941eu, tyrL96pro 0 141 *Ratιo of the amount of mutant needed to give the mid-OD of the standard curve to the amount of 574 needed to give the mid-OD of the standard curve in an Erb2-ECD ELISA A number less than 1 0 indicates that the mutant binds Erb2 better than 574 binds The following mutants have also been constructed, and are currently under evaluation 659 L3 G6 serL50trp, metH34ser, tyrL92pro, ιleL931ys 659 L3 Gi l serL50trp, metH34ser, tyrL92ser, ιleL93arg, tyrL94gly 659 L3 29 serL50trp, metH34ser, tyrL92phe, tyrL96asn 659 L3 36 serL50trp, metH34ser, tyrL92phe, tyrL941eu, tyrL96pro L2F5 L3G6 serL50trp, tyrL53gly, metH341eu, tyrL92pro, ιleL931ys L2F5 L3G1 1 serL50trp, tyrL53gly, metH341eu, tyrL92ser, ιleL93arg, tyrL94gly L2F5 L29 serL50trp, tyrL53gly, metH341eu, tyrL92phe, tyrL96asn L2F5 L36 serL50trp, tyrL53gly, metH341eu, tyrL92phe, tyrL941eu, tyrL96pro L2F5 L3G6 655 serL50trp, tyrL53gly, metH35ser, tyrL92pro, ιleL931ys L2F5 L3G1 1 655 serL50trp, tyrL53gly, metH34ser, tyrL92ser, ιleL93arg, tyrL94gly L2F5 L29 655 serL50trp, tyrL53gly, metH34ser, tyrL92phe, tyrL96asn L2F5 L36 655 serL50trp, tyrL53gly, metH34ser, tyrL92phe, tyrL941eu, tyrL96pro The following mutants, suggested by a homology scan, are currently being constructed 678 thrH30ala 679 thrH30ser 680 lysH64arg 681 leuH96val 682 thrL97ala 683 thrL97ser 684 tyrL96phe 685 tyrL96ala 686 tyrL91phe 687 thrL56ala 688 glnL28ala 689 glnL28glu The preferred amino acid at H34 would be methionine A change to leucine might be made if there were found to be oxidation at this position AsnH52 and asnH53 were found to be strongly preferred for binding Changing these residues to alanine or aspartic acid dramatically decreased binding An intact antibody comprising the variable light and heavy domains of humanized version 574 with a human IgGl heavy chain constant region has been prepared (see U S Patent No 5,821 ,337) The intact antibody is produced by Chinese Hamster Ovary (CHO) cells That molecule is designated rhuMAb 2C4 herein Example 4 Monoclonal Antibody 2C4 Blocks EGF, TGF-α or HRG Mediated Activation of MAPK Many growth factor receptors signal through the mitogen-activated protein kinase (MAPK) pathway These dual specificity kinases are one ofthe key endpo ts in signal transduction pathways that ultimately triggers cancer cells to divide The ability of monoclonal antibody 2C4 or HERCEPTIN® to inhibit EGF, TGF-α or HRG activation of MAPK was assessed in the following way MCF7 cells ( 10 cells/well) were plated in serum containing media in 12- well cell culture plates The next day, the cell media was removed and fresh media containing 0 1 % serum was added to each well This procedure was then repeated the following day and prior to assay the media was replaced with serum-free binding buffer (Jones ef al J Bwl Chem 273 1 1667-74 (1998), and Schaefer ef α/ J Bwl Chem 274 859-66 (1999)) Cells were allowed to equilibrate to room temperature and then incubated for 30 minutes with 0 5 mL of 200 nM HERCEPTIN® or monoclonal antibody 2C4 Cells were then treated with 1 nM EGF, 1 nM TGF-α or 0 2 nM HRG for 15 minutes The reaction was stopped by aspirating the cell medium and then adding 0 2 mL SDS PAGE sample buffer containing 1 % DTT MAPK activation was assessed by Western blotting using an anti-active MAPK antibody (Promega) as described previously (Jones ef al J Bwl Chem 273 1 1667-74 (1998)) As shown in Fig 10, monoclonal antibody 2C4 significantly blocks EGF, TGF-α and HRG mediated activation of MAPK to a greater extent than HERCEPTIN® These data suggest that monoclonal antibody 2C4 binds to a surface of ErbB2 that is used for its association with either EGFR or ErbB3 and thus prevents the formation of the signaling receptor complex Monoclonal antibody 2C4 was also shown to inhibit heregulin (HRG) dependent Akt activation Activation ofthe PI3 kinase signal transduction pathway is important for cell survival (Carraway etai J Bwl Chem 270 71 1 1- 6 (1995)) In tumor cells, PI3 kinase activation may play a role in the invasive phenotype (Tan ef al Cancer Reearch 59 1620-1625, (1999)) The survival pathway is primarily mediated by the seπne/threonine kinase AKT (Bos etai Trends Biochem Sci 20 441-442 ( 1995) Complexes formed between ErbB2 and either ErbB3 or EGFR can initiate these pathways in response to heregulin or EGF, respectively (Olayioye et al Mol & Cell Bwl 18 5042 51 ( 1998), Karunagaran e a/ EMBO Journal 15 254-264 (1996), and Krymskaya ef α/ Am J Physwl 276 L246-55 (1999)) Incubation of MCF7 breast cancer cells with 2C4 inhibits hereguhn-mediated AKT activation Moreover the basal level of AKT activation present in the absence of heregulin addition is further reduced by the addition of 2C4 These data suggest that 2C4 may inhibit ErbB hgand-activation of PI3 kinase and that this inhibition may lead to apoptosis The increased sensitivity to apoptosis may manifest in a greater sensitivity of tumor cells to the toxic effects of chemotherapy Thus, monoclonal antibody 2C4 inhibits ligand initiated ErbB signaling through two major signal transduction pathways - MAP Kinase (a major prohferati ve pathway) and P 13 kinase (a major survi val/anti-apoptotic pathway) Example 5 Combination of Monoclonal Antibody 2C4 and HERCEPTIN® in vivo A xenograft model using the lung adenocarcinoma cell line, Calu-3, was used to assess the efficacy of anti HER2 monoclonal antibodies, either alone or in combination, to suppress tumor growth Female NCR nude mice were inoculated subcutaneously with 20 x 10 cells in 0 1 mL Tumor measurements were taken twice per week and 3 when tumor nodules reached a volume of 100 mm , animals were randomized to 7 treatment groups The treatment groups were (a) control monoclonal antibody, MAb 1766, (b) HERCEPTIN®, 10 mg/kg, (c) monoclonal antibody 7C2, 10 mg/kg, (d) monoclonal antibody 2C4, 10 mg/kg, (e) HERCEPTIN® and 7C2, each at 10 mg/kg, (f) HERCEPTIN® and 2C4, each at 10 mg/kg, and (g) Monoclonal antibodies 2C4 and 7C2, each at 10 mg/kg Animals were treated twice per week until day 24 Tumor volumes were measured twice per week until day 38 As shown in the bar graph in Fig 11, treatment of the Calu-3 tumor-bearing mice with 2C4 or HERCEPTIN® significantly inhibited the growth of the tumors The combination of HERCEPTIN® and 2C4 or HERCEPTIN® and 7C2 was superior to either monoclonal antibody administered alone Example 6 Treating Colorectal Cancer with Monoclonal Antibody 2C4 Human colorectal cell lines such as HCA-7, LS174T or CaCo-2 are implanted subcutaneously in athymic nude mice as described in Sheng ef al J Clin Invest 99 2254-2259 (1997) Once tumors are established to about 3 100 mm in volume, groups of animals are treated with 10-50 mg/kg of monoclonal antibody 2C4 administered twice weekly by injection in the lntrapeπtoneal cavity Monoclonal antibody 2C4 suppresses growth of colorectal xenografts in vivo Example 7 Treating Breast Cancer with Humanized 2C4 The effect of rhuMAb 2C4 or HERCEPTIN® on human breast cancer cells which do not overexpress ErbB2 was assessed in a 3 day Alamar Blue assay (Ahmed, S A J Immunol Methods 170 21 1-224 (1994), and Page ef al Int J Oncol 3 473-476 (1994)) The cells used in this assay were MDA-175 human breast cancer cells which express ErbB2 at a 1+ level As shown in Fig 12, the growth of the breast cancer cell line, MDA-175, is significantly inhibited in a dose-dependent manner by the addition of rhuMAb 2C4 in comparison to HERCEPTIN® treatment The efficacy of rhuMAb 2C4 against MCF7 xenografts which are estrogen receptor positive (ER+) and express low levels of ErbB2 was assessed Female mice supplemented with estrogen were used rhuMAb 2C4 was administered at a dose of30mg/kg every week As shown in Fig 13, rhuMAb 2C4 was effective in inhibiting breast cancer tumor growth in vivo, where the breast cancer was not characterized by overexpression of ErbB2 Example 8 Pharmacokinetics, Metabolism and Toxicology of 2C4 rhuMAb 2C4 was stable in human serum No evidence or aggregates of complex formation in biological matrices was observed In mice, rhuMAb 2C4 cleared faster than HERCEPTIN® Pharmacokinetic studies indicate that weekly administration of about 2-6mg/kg of rhuMAb 2C4 should result in serum concentrations similar to HERCEPTIN® as presently dosed Resulting serum 2C4 exposure should greatly exceed IC,„ determined in vitro A toxicology study was carried out in cynomolgus monkeys (2 males and 2 females per group) rhuMab 2C4 was administered intravenously at 0, 10, 50 or 100 mg/kg twice a week for 4 weeks The toxicology study measurements included body weights (-2, -1 weeks and weekly thereafter), food consumption (qualitative, daily), physical examinations with assessment of blood pressure, electrocardiogram (ECG), and body temperature (-2, -1 weeks and weeks 2 and 4, 4 hours post-dose following that weeks second dose), cardiac ultrasound evaluations (following first dose week 1 and end of study, week 4), clinical pathology (baseline and end of weeks 2 and 4), uπnalysis (baseline and end of weeks 2 and 4), antibody analysis sampling (baseline and end of weeks 2 and 4), as well as necropsy and histopathology analysis All animals in all groups survived to the end of the study No significant clinical observations, or differences among groups, were noted Necropsy results showed no significant gross abnormalities in organs from any animals No significant microscopic abnormalities were observed by in tissues from any of the animals No significant changes in ECG were noted from initiation to completion ofthe study In addition, no differences among the groups were seen Example 9 Dose Escalation Cancer patients are administered a first dose of rhuMAb 2C4 at one of five dose levels (0 05, 0 5, 2 0, 4 O or 1 Omg/kg, 6 subjects per dose level), followed by a 4 week wash-out Week 5 patients are given the same dose weekly 4 times followed by a further 4 week wash-out Patients with complete response, partial response or stable disease are eligible for extension studies Example 10 Therapy of Relapsed or Refractory Metastatic Prostate Cancer RhuMAb 2C4 is a full-length, humanized monoclonal antibody (produced in CHO cells) directed against ErbB2 RhuMab 2C4 blocks the associated of ErbB2 with other ErbB family members thereby inhibiting mtracellular signaling through the ErbB pathway In contrast to HERCEPTIN®, rhuMAb 2C4 not only inhibits the growth of ErbB2 overexpressing tumors but also blocks growth of tumors that require ErbB hgand-dependent signaling RhuMAb 2C4 is indicated as a single agent for treatment of hormone-refractory (androgen independent) prostate cancer patients Primary endpoints for efficacy include overall survival compared to best available care (Mitoxantrone/Prednisone), when used as a single agent, and safety Secondary efficacy endpoints include time to disease progression, response rate, quality of life, pain and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) RhuMAb 2C4 is also indicated in combination with chemotherapy for treatment of hormone-refractory (androgen independent) prostate cancer patients Primary endpoints for efficacy include overall survival compared to chemotherapy, and safety Secondary efficacy endpoints include time to disease progression, response rate, quality of life, pain and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) Examples of drugs that can be combined with the antι-ErbB2 antibody (which blocks ligand activation of an ErbB2 receptor) to treat prostate cancer (e g androgen independent prostate cancer) include a farnesyl transferase inhibitor, an anti-angiogenic agent (e g an anti-VEGF antibody), an EGFR-targeted drug (e g C225 or ZD1839), another antι-ErbB2 antibody (e g a growth inhibitory antι-ErbB2 antibody such as HERCEPTIN®, or an antι-ErbB2 antibody which induces apoptosis such as 7C2 or 7F3, including humanized and/or affinity matured variants thereof), a cytokine (e g IL-2, IL-12, G-CSF or GM-CSF), an anti-androgen (such as flutamide or cyproterone acetate), leuprohde, suramin, a chemotherapeutic agent such as vinblastine, estramustine, mitoxantrone, harozole (a retinoic acid metabolism-blocking agent), cyclophosphamide, anthracychne antibiotics such as doxorubicin, a taxane (e g pachtaxel or docetaxel), or methotrexate, or any combination of the above, such as vinblastine/estramustine or cyclophosphamide/doxorubicin/methotrexate, prednisone, hydrocortizone, or combinations thereof Standard doses for these various drugs can be administered, e g 40 mg/m 2 /wk docetaxel (TAXOTERE®), 6 (AUC) carboplatin, and 200mg/πr pachtaxel (TAXOL®) Example 11 Therapy of Metastatic Breast Cancer RhuMAb 2C4 is indicated as a single agent for treatment of metastatic breast cancer patients whose tumors do not overexpress ErbB2 Primary endpoints for efficacy include response rate and safety Secondary efficacy endpoints include overall survival, time to disease progression, quality of life, and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) RhuMAb 2C4 is also indicated in combination with chemotherapy for treatment of metastatic breast cancer patients whose tumors do not overexpress ErbB2 Primary endpoints for efficacy include overall survival compared to chemotherapy alone, and safety Secondary efficacy endpoints include time to disease progression, response rate, quality of life, and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) Examples of drugs that can be combined with the antι-ErbB2 antibody (which blocks ligand activation of an ErbB2 receptor) to treat breast cancer (e g metastatic breast cancer which is not characterized by ErbB2 overexpression) include chemotherapeutic agents such as anthracychne antibiotics (e g doxorubicin), cyclophosphomide, a taxane (e g pachtaxel or docetaxel), navelbine, xeloda, mitomycin C, a platinum compound, oxahplatin, gemcitabine. or combinations of two or more of these such as doxorubicin/cyclophosphomide, another antι-ErbB2 antibody (e g a growth inhibitory antι-ErbB2 antibody such as HERCEPTIN®, oi an antι-ErbB2 antibody which induces apoptosis such as 7C2 or 7F3, including humanized or affinity matured variants thereof), an anti-estrogen (e g tamoxifen), a farnesyl transferase inhibitor, an anti-angiogenic agent (e g an anti-VEGF antibody), an EGFR-targeted drug (e g C225 or ZD1839), a cytokine (e g IL-2, IL-12, G-CSF or GM-CSF), or combinations of the above Standard dosages for such additional drugs may be used RhuMAb 2C4 is additionally indicated in combination with HERCEPTIN® for treatment of metastatic breast cancer patients whose tumors overexpress ErbB2 Primary endpoints for efficacy include response rate, and safety Secondary efficacy endpoints include time to disease progression, overall survival compared to HERCEPTIN® alone, quality of life, and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) HERCEPTIN® is administered IV as an initial loading dose of 4mg/kg followed by a weekly maintenance dose of 2 mg/kg HERCEPTIN® is supplied as a lyophihzed powder Each vial of HERCEPTIN® contains 440mg HERCEPTIN®, 9 9 mg L-histidine HC1, 6 4 mg L-histidine, 400 mg α-α-trehalose dihydrate, and 1 8 mg polysorbate 20 Reconstitution with 20 mL of Bacteriostatic Water for Injection (BWFI) containing 1 1% benzyl alcohol as a preservative, yields 21 mL of a multi-dose solution containing 21 mg/mL HERCEPTIN®, at a pH of approximately 6 0 Example 12 Therapy of Lung Cancer RhuMAb 2C4 is indicated as a single agent for treatment of stage Mb or IV non-small cell lung cancer (NSCLC) Primary endpoints for efficacy include response rate, and safety Secondary efficacy endpoints include overall survival, time to disease progression, quality of life, and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) RhuMAb 2C4 is also indicated in combination with chemotherapy for treatment of metastatic non-small cell lung cancer patients Primary endpoints for efficacy include overall survival compared to standard therapy, and safety Secondary efficacy endpoints include time to disease progression, response rate, quality of life and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) Examples of additional drugs which can be combined with the antibody (which binds ErbB2 and blocks ligand activation of an ErbB receptor) to treat lung cancer, include chemotherapeutic agents such as carboplatin, a taxane (e g pachtaxel or docetaxel), gemcitabine, navelbme, cisplatin, oxaliplatm, or combinations of any of these such as carboplatin/docetaxel, another antι-ErbB2 antibody (e g a growth inhibitory antι-ErbB2 antibody such as HERCEPTIN®, or an antι-ErbB2 antibody which induces apoptosis such as 7C2 or 7F3, including humanized or affinity matured variants thereof), a farnesyl transferase inhibitor, an anti-angiogenic agent (e g an anti-VEGF antibody), an EGFR-targeted drug (e g C225 or ZD1839), a cytokine (e g IL-2, IL-12, G-CSF or GM-CSF), or combinations of the above Example 13 Therapy of Colorectal cancer RhuMAb 2C4 is indicated as a single agent for treatment of metastatic colorectal cancer Primary endpoints for efficacy include response rate and safety Secondary efficacy endpoints include overall survival, time to disease progression, quality of life, and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) RhuMAb 2C4 is also indicated in combination with chemotherapy for treatment of metastatic colorectal cancer patients Primary endpoints for efficacy include overall survival compared to standard therapy, and safety Secondary efficacy endpoints include time to disease progression, response rate, quality of life, and/or duration of response RhuMAb 2C4 is administered intravenously (IV) weekly or every three weeks at 2 or 4 mg/kg, respectively, until disease progression The antibody is supplied as a multi-dose liquid formulation (20mL fill at a concentration of 20mg/mL or higher concentration) Examples of chemotherapeutic agents used to treat colorectal cancer, which can be combined with the antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, include 5-fluorouracιl (5-FU), leucovoπn (LV), CPT-11 , levamisole, or combinations of any two or more of these, e.g., 5-FU/LV/CPT-l l . Standard dosages of such chemotherapeutic agents can be administered. Other drugs that may be combined with the antι-ErbB2 antibody to treat colorectal cancer include a farnesyl transferase inhibitor; an anti-angiogenic agent (e.g an anti-VEGF antibody), an EGFR-targeted drug (e.g. C225 or ZD1839); a cytokine (e.g. IL-2, IL-12, G-CSF or GM-CSF); another antι-ErbB2 antibody (e.g. a growth inhibitory antι-ErbB2 antibody such as HERCEPTIN®, or an antι-ErbB2 antibody which induces apoptosis such as 7C2 or 7F3, including humanized or affinity matured variants thereof); or combinations of the above.

Claims: What is claimed is 1 A method of treating cancer in a human, wherein the cancer expresses epidermal growth factor receptor (EGFR), comprising administering to the human a therapeutically effective amount of an antibody which binds ErbB2 2 The method of claim 1 wherein the antibody blocks ligand activation of an ErbB receptor 3 The method of claim 2 wherein the antibody blocks binding of monoclonal antibody 2C4 to ErbB2 The method of claim 1 wherein the cancer is characterized by excessive activation of EGFR The method of claim 4 wherein the cancer overexpresses an ErbB ligand The method of claim 5 wherein the ErbB ligand is transforming growth factor alpha (TGF-α) The method of claim 1 wherein the antibody blocks TGF-α activation of mitogen-acti vated protein kinase (MAPK) The method of claim 1 wherein the cancer is not characterized by overexpression of ErbB2 receptor The method of claim 1 wherein the cancer is selected from the group consisting of colon, rectal and colorectal cancer 0 The method of claim 9 further comprising administering a chemotherapeutic agent to the human 1 1 The method of claim 10 wherein the chemotherapeutic agent is selected from the group consisting of 5 fluorouracil (5-FU), leucovoπn (LV), CPT-1 1, and levamisole 2 The method of claim 1 wherein the cancer is lung cancer 3 The method of claim 12 wherein the cancer is non-small cell lung cancer 4 The method of claim 12 further comprising administering a chemotherapeutic agent to the human 5 The method of claim 14 wherein the chemotherapeutic agent is selected from the group consisting of a taxane, gemcitabine, navelbine, cisplatin, oxaliplatm, and carboplatin 6 The method of claim 1 wherein the antibody has a biological characteristic of monoclonal antibody 2C4 The method of claim 16 wherein the antibody comprises monoclonal antibody 2C4 or humanized 2C4 The method of claim 1 wherein the antibody is an antibody fragment The method of claim 18 wherein the antibody fragment is a Fab fragment The method of claim 1 wherein the antibody is not conjugated with a cytotoxic agent The method of claim 18 wherein the antibody fragment is not conjugated with a cytotoxic agent The method of claim 1 wherein the antibody is conjugated with a cytotoxic agent The method of claim 1 further comprising administering to the human a therapeutically effective amount of a second therapeutic agent selected from the group consisting of a second different antibody which binds ErbB 2, a chemotherapeutic agent, an EGFR-targeted drug, an anti angiogenic agent, an anti-hormonal compound, a cardioprotectant, and a cytokine The method of claim 1 comprising administering at least one dose of the antibody to the human in an amount from about 0 5mg/kg to about 1 Omg/kg The method of claim 24 comprising administering the dose about every week The method of claim 24 comprising administering the dose about eveiy three weeks A method of treating cancer in a human, wherein the cancer is not characterized by overexpression of the ErbB2 receptor, comprising administering to the human a therapeutically effective amount of an antibody which binds to ErbB2 and blocks ligand activation of an ErbB receptor The method of claim 27 wherein the cancer is breast cancer The method of claim 28 wherein the cancer is metastatic breast cancer The method of claim 28 further comprising administering a chemotherapeutic agent to the human The method of claim 30 wherein the chemotherapeutic agent is selected from the group consisting of an anthracychne antibiotic, cyclophosphomide, a taxane, navelbine, xeloda, mitomycin C, oxaliplatm, gemcitabine, and a platinum compound A method of treating cancer in a human comprising administering to the human therapeutically effective amounts of (a) a first antibody which binds ErbB2 and inhibits growth of cancer cells which overexpress ErbB2, and (b) a second antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor The method of claim 32 wherein the first antibody comprises monoclonal antibody 4D5 or humanized 4D5 and the second antibody comprises monoclonal antibody 2C4 or humanized 2C4 A method of treating cancer in a human, wherein the cancer is selected from the group consisting of colon, rectal and colorectal cancer, comprising administering to the human a therapeutically effective amount of an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor An article of manufacture comprising a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB 2, and further comprising a package insert indicating that the composition can be used to treat cancer which expresses epidermal growth factor receptor (EGFR) An article of manufacture comprising a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, and further comprising a package insert indicating that the composition can be used to treat cancer, wherein the cancer is not characterized by overexpression of the ErbB2 receptor An article of manufacture comprising (a) a first container with a composition contained therein, wherein the composition comprises a first antibody which binds ErbB2 and inhibits growth of cancer cells which overexpress ErbB2, and (b) a second container with a composition contained therein, wherein the composition comprises a second antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor The article or manufacture of claim 37 further comprising a package insert indicating that the first and second antibody compositions can be used to treat cancer An article of manufacture comprising a container and a composition contained therein, wherein the composition comprises an antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor, and further comprising a package insert indicating that the composition can be used to treat a cancer selected from the group consisting of colon, rectal and colorectal cancer A humanized antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor The humanized antibody of claim 40 which binds ErbB2 essentially as effectively as murine monoclonal antibody 2C4 The humanized antibody of claim 40 comprising a variable heavy (V H ) domain which comprises nonhuman hypervanable region residues incorporated into a human V H domain and further comprises a framework region (FR) substitution at a position selected from the group consisting of 69H, 71H and 73H, utilizing the numbering system set forth in Kabat (1991) The humanized antibody of claim 42 comprising FR substitutions at positions 69H, 71H and 73H The humanized antibody of claim 40 comprising V H domain complementarity determining region (CDR) residues GFTFTDYTMX (SEQ ID NO 7), DVNPNSGGSIYNQRFKG (SEQ ID NO 8), and NLGPSFYFDY (SEQ ID NO 9) The humanized antibody of claim 40 comprising the V H domain amino acid sequence in SEQ ID NO 4 The humanized antibody of claim 40 comprising variable light (V L ) domain complementarity determining region (CDR) residues KASQDVSIGVA (SEQ ID NO 10), SASYXXX (SEQ ID NO 1 1 ), and QQYYIYPYT (SEQ ID NO 12) The humanized antibody of claim 40 comprising the V L domain amino acid sequence in SEQ ID NO 3 The humanized antibody of claim 40 which is an intact IgGl antibody The humanized antibody of claim 40 which is an antibody fragment The humanized antibody of claim 49 which is a Fab fragment An affinity matured antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor A composition comprising the humanized antibody of claim 40 and a pharmaceutically acceptable carrier An lmmunoconjugate comprising the humanized antibody of claim 40 conjugated with a cytotoxic agent Isolated nucleic acid encoding the humanized antibody of claim 40 A vector comprising the nucleic acid of claim 54 A host cell comprising the vector of claim 55 A process of producing a humanized antibody comprising culturing the host cell of claim 56 so that the nucleic acid is expressed 58. The process of claim 57 further comprising recovering the humanized antibody from the host cell culture. 59. The process of claim 58 wherein the humanized antibody is recovered from the host cell culture medium

Inventors: ADAMS CAMELLIA W, PRESTA LEONARD G, SLIWKOWSKY MARK, ADAMS, CAMELLIA, W., PRESTA, LEONARD, G., SLIWKOWSKY, MARK
Applicants: GENENTECH INC, GENENTECH, INC.
Application year: 2000
Main classification: A61K47
IPC codes: A61K31, A61K33, A61K39, A61K45, A61K47, A61P35, A61P43, C07K16