Conditions: Pancreatic Cancer Cancer of the Pancreas Pancreas Cancer
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 16
Healthy volunteers: no

Brief summary:
The central hypothesis is that the addition of CDX-301 to CDX-1140 radically improves anti-tumor immunity in patients with pancreatic ductal adenocarcinoma.

Detailed description:

Arms:
arm 1: Patients randomized to the CDX-1140 monotherapy arm will receive a single IV infusion at a dose of 1.5 mg/kg, with surgery to follow 7-12 days after administration of CDX-1140. arm 2: Patients randomized to the CDX-301 + CDX-1140 arm will receive CDX-301 at 75 mcg/kg/day as a subcutaneous injection every day for 5 days (Days 1-5) with CDX-1140 IV at 1.5 mg/kg on Day 8 +/-1 day. Surgery will be 7-12 days after administration of CDX-1140.

Interventions: intervention 1: CDX-301 intervention 2: CDX-1140 intervention 3: Research blood draw
Intervention descriptions: intervention 1: The drug will be supplied free of charge by Celldex intervention 2: The drug will be supplied free of charge by Celldex intervention 3: At screening; prior to first therapeutic dose of CDX-1140, on the day of the infusion; and at the time of surgery

Protocol document:
Prot_SAP_000.pdf: 
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Testing the immunologic effects of CDX-301 and CDX-1140 in resectable pancreatic cancer patients 
 
Washington University School of Medicine 
Department of Surgery, 660 S. Euclid Ave., CB 8109, St. Louis, MO  63110 
 
Protocol #: 202011125 
Version Date: 30 November 2023 
 
Principal Investigator: 
Roheena Z. Panni, M.D. 
Phone:  (314) 362-7046 
E-mail:  roheenazpanni@wustl.edu  
 
Sub-Investigators 
 
 
 
 
Modality 
David DeNardo, Ph.D. 
 
 
 
Molecular Oncology 
Ryan Fields, M.D. 
 
 
 
 
Surgical Oncology 
William Chapman, M.D. 
 
 
 
Transplant Surgery 
Maria Bernadette Doyle, M.D. 
 
 
Transplant Surgery 
Adeel Khan, M.D. 
 
 
 
 
Transplant Surgery 
William Hawkins, M.D. 
 
 
 
Hepatobiliary Surgery 
Dominic Sanford, M.D. 
 
 
 
Hepatobiliary Surgery 
Natasha Leigh, M.D.  
 
 
 
Hepatobiliary Surgery 
Kian-Huat Lim, M.D., Ph.D.  
 
 
Medical Oncology 
Olivia Aranha, M.D.   
 
 
 
Medical Oncology 
Nusayba Bagegni, M.D.  
 
 
 
Medical Oncology 
Salman Chaudhry, M.D.  
 
 
 
Medical Oncology 
Patrick Grierson, M.D.  
 
 
 
Medical Oncology 
Tanner Johanns, M.D., Ph.D.  
 
 
Medical Oncology 
Moh’d Khushman, M.D. 
 
 
 
Medical Oncology 
Peter Oppelt, M.D. 
 
 
 
 
Medical Oncology 
Katrina Pedersen, M.D.  
 
 
 
Medical Oncology 
Caron Rigden, M.D.  
 
 
 
Medical Oncology 
Rama Suresh, M.D.   
 
 
 
Medical Oncology 
Benjamin Tan, M.D.   
 
 
 
Medical Oncology 
Nikolaos Trikalinos, M.D.  
 
 
 
Medical Oncology 
Crystal Wolf, M.S. 
 
 
 
 
Medical Oncology 
Samuel Ballentine, M.D. 
 
 
 
Pathology and Immunology 
Liang-I Kang, M.D., Ph.D. 
 
 
 
Pathology and Immunology 
 
Study Drugs:  
 
CDX-301, CDX-1140 
IND#: 
153513 
IND Sponsor: 
Roheena Z. Panni, M.D. 
NCT#: 
NCT04536077 


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Funded by: 
Celldex Therapeutics (drug only) 
 
The Foundation for Barnes-Jewish Hospital 
 
Swim Across America – Siteman Investment Program 
 
National Institutes of Health 
 
CONFIDENTIAL 
The information contained in this document is regarded as confidential and, except to the extent necessary to 
obtain informed consent, may not be disclosed to another party unless law or regulations require such 
disclosure.  Persons to whom the information is disclosed must be informed that the information is 
confidential and may not be further disclosed by them 
 
 
 
 


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Testing the immunologic effects of CDX-301 and CDX-1140 in resectable pancreatic cancer 
patients 
 
Protocol Revision History 
 
Initial Approval 
 
 
 
 
 
 
 
19 November 2020 
Amendment #1 
 
 
 
 
 
 
 
03 February 2021 
Amendment #2 
 
 
 
 
 
 
 
30 September 2021 
Amendment #2.1 
 
 
 
 
 
 
 
08 December 2021 
Amendment #3 
 
 
 
 
 
 
 
06 October 2022 
Amendment #4 
 
 
 
 
 
 
 
13 December 2022 
Amendment #4.1 
 
 
 
 
 
 
 
30 November 2023 
 
 
 


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STATEMENT OF COMPLIANCE 
The trial will be carried out in accordance with International Conference on Harmonisation Good 
Clinical Practice (ICH GCP) and the following:  
 
• United States (US) Code of Federal Regulations (CFR) applicable to clinical studies (45 
CFR Part 46, 21 CFR Part 50, 21 CFR Part 56, 21 CFR Part 312, and/or 21 CFR Part 812)  
 
National Institutes of Health (NIH)-funded investigators and clinical trial site staff who are 
responsible for the conduct, management, or oversight of NIH-funded clinical trials have 
completed Human Subjects Protection and ICH GCP Training. 
 
The protocol, informed consent form(s), recruitment materials, and all participant materials will 
be submitted to the Institutional Review Board (IRB) for review and approval.  Approval of both 
the protocol and the consent form must be obtained before any participant is enrolled.  Any 
amendment to the protocol will require review and approval by the IRB before the changes are 
implemented to the study.  In addition, all changes to the consent form will be IRB-approved; a 
determination will be made regarding whether a new consent needs to be obtained from 
participants who provided consent, using a previously approved consent form. 
 
 
 
 
 
 
 
 


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PROTOCOL SUMMARY 
 
Synopsis 
 
Title: 
Testing the immunologic effects of CDX-301 and CDX-1140 in 
resectable pancreatic cancer patients 
Study Description: 
Our central hypothesis is that the addition of CDX-301 to CDX-1140 
radically improves anti-tumor immunity in patients with pancreatic 
ductal adenocarcinoma. 
Objectives: 
Primary Objective: To determine the amount of intratumoral 
conventional dendritic cells in patients with resectable pancreatic 
cancer treated with neoadjuvant CDX-1140 vs. CDX-301 plus CDX-
1140. 
 
Exploratory Objectives:  
1. To determine the changes in global immune profile of in patients 
with resectable pancreatic cancer treated with neoadjuvant CDX-
1140 vs. CDX-301 plus CDX-1140. 
2. To assess local control rate in patients with resectable pancreatic 
cancer treated with neoadjuvant CDX-1140 vs. CDX-301 plus 
CDX-1140. 
3. To assess distant metastasis-free survival of surgically resectable 
pancreatic cancer patients treated with neoadjuvant CDX-1140 
vs. CDX-301 plus CDX-1140. 
4. To assess overall survival of surgically resectable pancreatic 
cancer patients treated with neoadjuvant CDX-1140 vs. CDX-
301 plus CDX-1140. 
5. To assess extent of surgical margin negative resection in patients 
treated with neoadjuvant CDX-1140 vs. CDX-301 plus CDX-
1140. 
6. To assess the safety and tolerability profile of CDX-1140 vs. 
CDX-301 plus CDX-1140 in surgically resectable pancreatic 
cancer patients. 
Endpoints: 
Primary Endpoint: Intratumoral conventional dendritic cells (cDCs) 
at surgery.  
 
Exploratory Endpoints: Global immune profiling by CyTOF, single 
cell RNASeq analysis, and histologic assessments, local control rate, 
distant metastasis-free survival, overall survival, margin negative 
resection rate, and adverse events. 
Study Population: 
The study will enroll adults with surgically resectable pancreatic 
ductal adenocarcinoma. Enrollment will continue until 12 patients 
evaluable for the primary objective have been enrolled in each arm. 
Phase: 
II 
Description of Sites / 
Facilities Enrolling: 
Siteman Cancer Center at Washington University School of 
Medicine. 


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Description 
of 
Study 
Intervention: 
Consenting and eligible patients will be randomized on a 1:1 basis 
CDX-1140 followed by surgery or CDX-301 plus CDX-1140 
followed by surgery until 12 patients evaluable for the primary 
objective have been enrolled in each arm. 
 
Patients randomized to the CDX-1140 monotherapy arm will receive 
a single IV infusion at a dose of 1.5 mg/kg, with surgery to follow 7-
12 days after administration of CDX-1140. 
 
Patients randomized to the CDX-301 + CDX-1140 arm will receive 
CDX-301 at 75 mcg/kg/day as a subcutaneous injection every day 
for 5 days (Days 1-5) with CDX-1140 IV at 1.5 mg/kg on Day 8 +/-
1 day.  Surgery will be 7-12 days after administration of CDX-1140. 
 
For both arms, patients will undergo blood collection at the start of 
treatment and at the time of surgery, and all surgically resected 
tissues will be subjected to biomarker analysis. 
Study Duration: 
36 months (recruitment) + 3 weeks (intervention) + 24 months 
(follow-up) + 24 months (analysis) 
Participant Duration: 
30 days 
 
 
 
 
 
 
 
 
 
  
 


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SCHEMA 
 
 
 
 
 


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Table of Contents 
PROTOCOL SUMMARY .............................................................................................................. 5 
Synopsis ...................................................................................................................................... 5 
SCHEMA ........................................................................................................................................ 7 
SCHEDULE OF ACTIVITIES..................................................................................................... 10 
Arm 1 Calendar ......................................................................................................................... 10 
Arm 2 Calendar ......................................................................................................................... 11 
1.0 
INTRODUCTION ............................................................................................................. 12 
1.1 
Study Rationale .............................................................................................................. 12 
1.2 
Background .................................................................................................................... 12 
1.3 
Study Design .................................................................................................................. 16 
1.4 
Risk/Benefit Assessment ................................................................................................ 20 
2 
OBJECTIVES AND ENDPOINTS ....................................................................................... 22 
3 
STUDY POPULATION ........................................................................................................ 23 
3.1 
Inclusion Criteria ............................................................................................................ 23 
3.2 
Exclusion Criteria ........................................................................................................... 24 
3.3 
Inclusion of Women and Minorities............................................................................... 25 
4 
REGISTRATION PROCEDURES ....................................................................................... 25 
4.1 
Confirmation of Patient Eligibility ................................................................................. 25 
4.2 
Patient Registration in the Siteman Cancer Center OnCore Database ........................... 25 
4.3 
Assignment of UPN ....................................................................................................... 26 
4.4 
Screen Failures ............................................................................................................... 26 
4.5 
Strategies for Recruitment and Retention ...................................................................... 26 
4.6 
Measures to Minimize Bias:  Randomization ................................................................ 26 
5 
TREATMENT PLAN............................................................................................................ 26 
5.1 
Premedication Administration........................................................................................ 26 
5.2 
Study Intervention Administration ................................................................................. 27 
5.3 
Definitions of Evaluability ............................................................................................. 27 
5.4 
Concomitant Therapy and Supportive Care Guidelines ................................................. 28 
5.5 
Women of Childbearing Potential .................................................................................. 29 
5.6 
Duration of Therapy ....................................................................................................... 30 
5.7 
Duration of Follow-up .................................................................................................... 30 
5.8 
Lost to Follow-Up .......................................................................................................... 30 
5.9 
Protocol Stopping Criteria .............................................................................................. 31 
6 
DOSE DELAYS/DOSE MODIFICATIONS ........................................................................ 31 
7 
REGULATORY AND REPORTING REQUIREMENTS ................................................... 32 
7.1 
Sponsor-Investigator Reporting Requirements .............................................................. 32 
7.2 
Exceptions to Expedited Reporting ................................................................................ 35 
8 
PHARMACEUTICAL INFORMATION ............................................................................. 36 
8.1 
CDX-301 ........................................................................................................................ 36 
8.2 
CDX-1140 ...................................................................................................................... 38 
9 
CORRELATIVE STUDIES .................................................................................................. 43 
9.1 
Fresh Tumor Tissue ........................................................................................................ 43 
9.2 
Archived Tumor Tissue .................................................................................................. 43 
9.3 
Research Blood .............................................................................................................. 43 
9.4 
Specimen Analysis ......................................................................................................... 44 


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10 
DATA SUBMISSION SCHEDULE ................................................................................. 45 
10.1 Adverse Event Collection in the Case Report Forms ..................................................... 46 
11 
MEASUREMENT OF EFFECT........................................................................................ 46 
12 
DATA AND SAFETY MONITORING ............................................................................ 46 
13 
STATISTICAL CONSIDERATIONS............................................................................... 47 
13.1 Study Design .................................................................................................................. 47 
13.2 Sample Size Calculation................................................................................................. 48 
13.3 Accrual ........................................................................................................................... 48 
13.4 Statistical Analyses ........................................................................................................ 48 
14 
REFERENCES .................................................................................................................. 50 
APPENDIX A: ECOG Performance Status Scale ........................................................................ 53 
APPENDIX B: Definitions for Adverse Event Reporting ............................................................ 54 
APPENDIX C: Reporting Timelines ............................................................................................ 56 
 
 
 
 
 


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SCHEDULE OF ACTIVITIES 
 
Arm 1 Calendar 
 
 
Screening3 
7-12 days prior 
to surgery 
Surgery 
Follow-up4 
Informed consent 
X 
 
 
 
ECOG PS 
X 
 
X7 
 
CBC w/diff 
X 
 
 
 
CMP 
X 
 
 
 
INR, aPTT 
X 
 
 
 
Pregnancy test1 
X 
 
 
 
Randomization 
X2 
 
 
 
CDX-1140 
 
X 
 
 
Research blood 
X 
X5 
X 
 
Research tissue 
 
 
X 
 
AE assessment6 
 
X 
X7,8 
X 
Progression and 
survival 
 
 
 
X 
1. For female patients of childbearing potential only. 
2. After confirmation of eligibility. 
3. Screening should occur no more than 6 weeks prior to surgery, CBC within 3 weeks prior to start of CDX-
1140. 
4. Follow-up will occur at standard of care office visits (approx. Q6M) for 24 months after surgery. 
5. Prior to CDX1140 administration. 
6. AEs will be collected from time of administration of CDX-1140 until surgery, or until 60 days after end of 
treatment if surgery doesn’t take place. A phone call or medical record check may take place at the 60 day 
time point (+/- 2 weeks) for AE collection if surgery doesn’t take place. 
7. Follow-up in person visit or call with physician’s office will occur 24-48 hours after administration of 
CDX-1140 to evaluate any acute changes.  
8. Assessment of AEs may be done at an outpatient visit 7 +/- 2 days after administration of CDX-1140 or 
after admission for surgery. 
 
 


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Arm 2 Calendar 
 
 
Screening5 D1 D2 D3 D4 D5 
D810 
Surgery3 
Follow-
up6 
Informed consent 
X 
 
 
 
 
 
 
 
 
ECOG PS 
X 
 
 
 
 
 
 
X8 
 
CBC w/diff 
X 
 
 
 
 
 
 
 
 
CMP 
X 
 
 
 
 
 
 
 
 
INR, aPTT 
X 
 
 
 
 
 
 
 
 
Pregnancy test1 
X 
 
 
 
 
 
 
 
 
Randomization 
X2 
 
 
 
 
 
 
 
 
CDX-1140 
 
 
 
 
 
 
X 
 
 
CDX-301 
 
X 
X 
X 
X 
X 
 
 
 
Research blood 
X4 
 
 
 
 
X4 
X4 
 
Research tissue 
 
 
 
 
 
 
 
X 
 
AE assessment 
 
 
X ------------------------------------ X7,8,9 
X7 
Progression and 
survival 
 
 
 
 
 
 
 
 
 
X 
1. For female patients of childbearing potential only. 
2. After confirmation of eligibility. 
3. 7-12 days after administration of CDX-1140. 
4. First research blood draw will take place at screening or at any point prior to the first dose of CDX-301, second 
on day 8 prior to CDX1140 administration, and third at time of surgery.  
5. Screening should occur no more than 6 weeks prior to surgery, CBC within 3 weeks prior to start of CDX-1140. 
6. Follow-up will occur at standard of care office visits (approx. Q6M) for 24 months after surgery. 
7. AEs will be collected from time of administration of CDX-301 until surgery, or until 60 days after end of 
treatment if surgery doesn’t take place. A phone call or medical record check may take place at the 60 day time 
point (+/- 2 weeks) for AE collection if surgery doesn’t take place. 
8. Follow-up in person visit or call with physician’s office will occur 24-48 hours after administration of CDX-
1140 to evaluate any acute changes.  
9. Assessment of AEs may be done at an outpatient visit 7 +/- 2 days after administration of CDX-1140 or after 
admission for surgery. 
10. Administration of CDX-1140 is on day 8 +/- 1 day. 
 
 
 


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1.0 
INTRODUCTION 
 
1.1 
Study Rationale 
 
The prognosis for pancreatic ductal adenocarcinoma (PDAC) patients is dismal. Therefore, 
the development of new and effective clinical approaches represents a significant unmet 
medical need. Unfortunately, attempts at immunotherapy in PDAC to date have not 
achieved significant clinical benefit as single agents1. This is likely due to the presence of 
a uniquely suppressive tumor microenvironment (TME). Two major drivers of this tumor 
protective microenvironment include a dense fibrotic tumor stroma and robust infiltration 
by tumor-supportive myeloid cells2, 3. High stromal density provides a barrier to the 
delivery of cytotoxic agents and limits T cell infiltration and function4, 5. Additionally, data 
from our group has shown that significant infiltration of PDAC tumors by immune-
suppressive macrophages decreases the efficacy of immunotherapy by inducing 
dysfunction in T cells6-9. While much focus has been on immune suppression within the 
PDAC TME, our recent data described below suggest immune priming by conventional 
dendritic cells (cDCs) may ultimately be the larger barrier to overcome. 
 
Conventional dendritic cells (cDCs) are central for generating tumor antigen specific 
responses in T cells 10. Thus, in animal models and human correlative studies, cDCs have 
been shown to be critical for responsiveness to both checkpoint immunotherapy and the 
induction of tumor immunity by radiation therapy10. Our striking new data has found that 
cDCs are severely dysfunctional in human PDAC patients. This dysfunction is driven by 
two mechanisms: 1) As we recently published (Meyer et al. Nature Comms. 2018 11) PDAC 
patients have impaired development of cDCs in their bone marrow, leading to functional 
depletion of circulating pre-DCs, impaired cross presentation to cytotoxic T lymphocytes 
(CTLs), and poor responsiveness to checkpoint inhibitors11; 2) In recent data (Hedge et al 
Cancer Cell 2020 12), we have shown that even when cDC development is not impaired, 
cDC1s are physically/biochemically excluded from the PDAC TME. We have found that 
treatment with systemic FLT3L and CD40 agonists overcomes cDC exclusion to drive 
tumor immunity that in turn slows tumor progression. 
 
1.2 
Background 
 
 Study disease 
 
Pancreatic ductal adenocarcinoma (PDAC) is a devastating disease whose 
incidence is increasing 13, 14. Currently, pancreatic cancer is the third most common 
cause of cancer death in the United States. Only 24% of pancreatic cancer patients 
survive >1 year from diagnosis, and only 9% live for 5 years 13, 15. Current therapies 
are woefully inadequate and costly14, 16. Efforts focusing on early detection are still 
in their infancy17. Proximate solutions to modifiable risk factors, such as smoking 
and obesity, are lacking18, 19. Many standard therapies that are effective for other 
cancers, including immune checkpoint blockade and radiation therapy, have little 
to no effect on survival in pancreatic cancer. In the last decade, multi-agent 


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cytotoxic chemotherapy has modestly improved the median survival at the cost of 
significant toxicity20, 21. Unfortunately, this increase in median survival has not 
translated into an overall survival benefit. New agents and novel approaches are 
desperately needed for pancreatic cancer. Any progress towards an effective 
treatment strategy for pancreatic cancer would be a highly significant healthcare 
advance.  
 
 Summary of Nonclinical Findings for CDX-301 
 
Hundreds of non-clinical studies have documented the biological activities of Flt3L 
in vivo and in vitro. Notably, CDX-301 is human Flt3L.  Administration of 
recombinant human Flt3L into mice and other laboratory species results in a broad 
expansion of HSC. These effects are transient, and hematopoietic values return to 
normal upon stopping recombinant Flt3L treatment. The most distinguishable in 
vivo CDX-301 effects have been observed within the dendritic cell (DC) 
compartment. Large numbers of DCs are generated in murine spleen, bone marrow, 
and the peripheral circulation, and these effects of recombinant Flt3L are far more 
potent than those following treatment with other DC growth promoting cytokines 
such as GM-SCF.  
 
 CDX-1140 Physical, Chemical, and Pharmaceutical Properties 
 
CDX-1140 is a human IgG2κ mAb with a calculated polypeptide molecular weight 
of 144,766 Da and a potential N-linked glycosylation site on the heavy chain. Based 
on the amino acid sequence, glycoform analysis, peptide mapping, and mass 
spectrometry, the overall structure of CDX-1140 is as expected for a human IgG2κ 
mAb with pairs of heavy and light chains stabilized through intra- and inter-chain 
disulfide bonds22. CDX-1140 is generated by in vitro Chinese hamster ovary (CHO) 
cell culture and using standard mAb purification methods. The CDX-1140 
formulated drug substance and drug product are identical in terms of formulation 
and concentration. 
 
 Rationale for CD40 agonism with CDX-1140  
 
Similar to other TNFR/TNFL family members,   CD40 signaling through the 
receptor appears optimal when the CD40L is constrained in a trimeric arrangement, 
thereby enforcing a co-localization or clustering of the CD40 itself, and the 
subsequent recruitment and interaction with TNF receptor associated factors 
(TRAFs). Thus, the requirement for FcR-mediated cross-linking of the agonist 
CD40 mAbs to effect a similar co-localization is reflected in the isotype-
dependence and FcR specificities of the resulting agonist activities. 
 
Two research groups concluded that FcγRIIb engagement was required for anti-
CD40 agonist activity 23, 24; however, it was cross-linking and not the intracellular 
signaling that was required, and cellular distribution as much as affinity was 
important for in vivo activity. Subsequently, it was shown that human IgG2 isotypes 


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of anti-CD40 mAb had greater agonist activities, such as B cell proliferation and 
CD70 up-regulation on DCs, than corresponding IgG1 isotypes and that this was a 
consequence of the IgG2 hinge region and was independent of FcγR binding 25. In 
general, the capacity of a particular mAb to promote colocalization or clustering of 
CD40, whether through FcγR interactions or independent of such interactions, 
favors downstream signaling and agonistic activities. Among several agonist anti-
CD40 mAb currently in oncology clinical trials is the highly agonistic CP-870,893 
mAb 26, 27. While clinical experience with CP-870,893 has provided encouraging 
evidence of activity, this was associated with significant dose-limiting toxicity and 
a maximally tolerated dose (MTD) of 0.2 mg/kg. Such a low dose (≤ 0.2 mg/kg) 
may not be ideal for systemic use, because saturation of CD40 on tissue resident 
DCs or macrophages may not be achieved at these dose levels due to the wide-
spread expression of CD40 on non-immune cells and some tumors28, 29. As these 
authors suggest, perhaps an alternative anti-CD40 mAb better suited for systemic 
use would have somewhat less potent agonist activity than CP-870,893 and thus 
could be used at higher doses, improving the likelihood of fully engaging 
macrophages and DCs in these tissues. As such we anticipate CDX-1140 overcome 
these issues. 
 
 Selected preclinical studies of CDX-301 and CDX-1140 
 
Flt3L Mobilizes Dendritic Cells 
• In mice, Flt3L increases the number of DC in the spleen, lymph nodes and 
peripheral blood. These DC are equivalent to splenic DC from untreated mice 
in presenting alloantigens and/or soluble antigens to T cells in vitro, and in 
priming an antigen-specific T cell response in naïve mice in vivo 30. 
• Flt3L administered subcutaneously at 100 μg/kg/day for 5-7 days was as 
effective as 14 days of such dosing in expanding the numbers of circulating DC 
in rhesus macaques. Numbers of DC peaked at approximately 4 days post 7 
days of treatment and decreased thereafter. The DC were predominantly of 
immature phenotype but were capable of being activated and expressing IL-12 
upon subsequent in vitro culture and stimulation with CD40L 31. 
• Flt3L treatment of humanized mice generated large numbers of human CD141+ 
(BDCA-3) and CD1c+ (BDCA-1) DC, and to a lesser extent plasmacytoid DCs, 
in the blood, spleen, and bone marrow. The CD141+ DC could be efficiently 
activated with poly-ICLC and crosspresentantigen to CD8 T cells 32. 
 
Flt3L Enhances Immune Responses 
• In mice immunized with ovalbumin, administration of Flt3L influences the 
class of antibody produced and enables productive immune responses to 
otherwise tolerogenic protocols 33. 
• Flt3L-treated mice developed lower cellular and humoral immune responses to 
transcutaneous administered hen egg lysozyme (HEL) than did PBS-treated 
control mice. In the presence of cholera toxin, however, Flt3L-treated mice 
developed significantly higher cellular and humoral immune responses to HEL 
when compared to PBS-treated mice 34. 


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Flt3L Enhances Anti-Tumor Responses and Retards Tumor Growth 
• Flt3L completely prevented B10.2 fibrosarcomas in >70% of mice when 
administered on the day of tumor cell inoculation (partial regression was 
observed in most other Flt3L-treated animals). Delaying treatment with a higher 
dose of Flt3L to 1 week after tumor inoculation still resulted in complete 
rejection of established tumors in 72% of mice. Spleen cells from Flt3L-treated 
mice transferred anti-tumor activity, which was abrogated by antibody 
 
 Pancreas Cancer-Specific Studies with CDX-301 and CDX-1140 
 
Mobilizing cDCs into early pancreatic lesions can reverse fibro-inflammatory 
responses  
We tested if increasing cDCs in early stages of PDAC could reassert TH1 and CTL-
mediated disease control. To accomplish this, we stimulated hematopoietic 
mobilization of cDC precursors using Fms-related tyrosine kinase 3 ligand (Flt3L) 
treatment 35-37. Flt3L administration at early stages of tumorigenesis resulted in 
robust infiltration of cDCs in the pancreas, including a 10-fold increase in cDC1s 
and revert disease acceleration and fibro-inflammatory pathology of PDAC in 
mice. Flt3L treatment also resulted in reduced number of pathogenic ROR-γt+ IL-
17A-expressing TH cells and increases in IFN-γ-producing TH1 cells. Flt3L 
treatment increased CD8+ T cell, proximity to lesions, effector function as measured 
by IFN-γ+ and TNF-α+ production, and proliferation. Together these data imply that 
restoring cDC numbers in early stages of PDAC results in a switch from pathogenic 
tumor-promoting TH17 to tumor-restraining TH1 and CD8+ CTL responses to 
neoantigens. 
 
Enhancing cDC infiltration and activation in advanced PDAC leads to disease 
stabilization 
Our observations raised the possibility that Flt3L-based cDC mobilization in 
established pancreatic tumors could benefit anti-tumor immunity. Additionally, our 
previous work has shown that established PDAC in human patients and mouse 
PDAC models can impair cDC1 development in the bone marrow 36 and therapeutic 
strategies might require boosting cDC mobilization to overcome this disruption. 
Thus, we treated PDAC bearing mice bearing advanced tumors with Flt3L. 
Notably, increases in cDC infiltration upon Flt3L treatment were more modest in 
established PDAC compared to premalignant pancreas and in this advanced setting 
FLT3L alone did not change intratumoral CTL infiltration.  
 
To overcome this barrier, we administered CD40-agonist IgGs to improve licensing 
and enhance APC function and survival 38, 39. We found the combination of Flt3L 
with CD40 agonists worked synergistically to drive massive influx of cDC1s and 
cDC2s, with CD40 agonist showing clear superiority and a >64-fold increase in 
cDC1s. Additionally, the combination with Flt3L triggered markedly enhanced 
intratumoral CD8+ CTL and CD4+ TH cell infiltration without TREG induction. 
Notably, the CD40 agonist plus Flt3L treatment elicited integrated anti-tumor 


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responses involving marked increases in infiltrating NK cells, NKT cells and γδT 
cells.  
 
Combining Flt3L administration with CD40 agonism resulted in improved disease 
control beginning a week into treatment in multiple PDAC mouse models. Together 
these data suggest synergistic activities of FLT3L (CDX-301) plus CD40 agonists 
(CDX-1140) can directly improve tumor immunity and retard disease progression 
in mouse models of PDAC.  
 
1.3 
Study Design 
 
 Overall Design 
 
Hypothesis: The combination of CDX-301 and CDX-1140 will work 
synergistically to improve anti-tumor immunity, both within tumor tissue and 
systemically. Specifically, we believe these two agents will combine to increase 
cDCs and T cells within tumor tissues. 
 
Clinical trial design: The trial is a phase II, single institution, open-label, 
randomized trial treating patients with surgically resectable pancreas cancer. 
Patients will be accrued upon designation of surgical resectability by our tumor 
board. Patients will be randomized to receive either CDX-1140 alone or CDX-310 
plus CDX-1140 prior to surgery. Patients will receive a single 7-day cycle of 
treatment followed by surgery 7-12 days after cycle completion. Surgical resection 
tissue will be accessed for endpoint and compared historical controls. 
 
 Justification for Dose 
 
Recombinant human FLT3 ligand, AMG949 originally developed by Immunex and 
subsequently acquired by Amgen, has been studied in numerous industry and 
investigator-initiated clinical trials.  Collectively, approximately 150 healthy 
volunteers and 380 cancer patients were enrolled on those trials.  Adverse events 
requiring cessation of treatment were rare (<5%).  However, FLT3 ligand did not 
demonstrate definitive anti-tumor activity in patients with ovarian cancer, breast 
cancer, or non-Hodgkin’s lymphoma.  This may have been related to the 
mobilization of immature DCs by FLT3 ligand and the absence of appropriate DC 
maturation signals and/or limited DC access to tumor antigens. 
 
More recently, recombinant human FLT3 ligand (CDX-301) developed by Celldex, 
which is identical in amino acid sequence to AMG949 but produced utilizing a 
serum-free manufacturing process, has been demonstrated to expand and mobilizes 
DCs into the peripheral blood and tissues, including into the tumor 
microenvironment. As of May 28, 2020, healthy volunteers (n=30), allogenic 
hematopoietic stem cell donors (n=4) or cancer patients (n=116), for a total of 150 
subjects, have been treated with CDX-301 as monotherapy or in combination with 
other agents. 


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CDX-301 has been shown to expand CD141+(BDCA3+) conventional DCs (cDCs) 
in healthy volunteers. In these same subjects, CDX-301 was also shown to expand 
precursor cDCs (pre-cDCs) that produce the two major cDC subsets, the 
CD141+(BDCA3+) and the CD1c+ DCs. DC expansion peaks approximately two 
weeks after initiation of FLT3 ligand therapy (see figure below). The intratumoral 
injection of CDX-301 also increases the number of CD141+ DCs in blood and in 
the injected tumor40. CDX-301 also expanded CD141+ DCs and augmented the 
kinetics, magnitude, and frequency of cellular and immune responses to a NY-ESO-
1 vaccine (CDX-1401) in patients with resected melanoma. 
 
 
 
Expansion of two dendritic cell populations in healthy volunteers treated with CDX-301 peaks at 10-14 days after 
treatment initiation. (source: Celldex Therapeutics) 
 
CDX-301 has been evaluated in two Celldex-sponsored clinical studies as 
monotherapy in healthy volunteers and donor/recipients (CDX301-02 and 
CDX301-03), in one study in combination with the antibody-drug conjugate 
glembatumumab vedotin in advanced melanoma (CDX011-05), and in one study 
in combination with CDX-1140 in advanced malignancies (CDX1140-01). CDX-
301 has also been investigated in four investigator-initiated studies: in combination 
with radiotherapy for non-small cell lung cancer (CDX301-53), in combination 
with poly-ICLC and radiotherapy in lymphoma (CDX301-51), in combination with 
poly-ICLC, radiotherapy and pembrolizumab in non-Hodgkin’s lymphoma, 
metastatic breast cancer and head and neck squamous cell carcinoma 
(CDX301-58), and in combination with poly-ICLC and the cancer vaccine CDX-
1401 in malignant melanoma (CDX1401-54).  
CDX-301 has been well 
tolerated. One SAE of grade 3 community-acquired pneumonia in the healthy 
volunteer study CDX301-02 was attributed to CDX-301.  Across all trials, no 
additional SAEs, and no deaths, have been assessed as related to CDX-301. In 
general treatment-related AE following CDX-301 administration are infrequent and 
mild to moderate in severity. Across all trials through August 2019, the most 
common treatment-related AE has been lymphadenopathy in 6 subjects (13%). 
Additional treatment-related grade 1 and grade 2 AEs that have been reported ≥ 5% 
of all patients treated with CDX-301 include: injection site reaction (including 
erythema, rash, reaction or pain; 8%), chills (6%), dyspepsia (6%), fatigue (6%), 
and hot flush (6%).  One case of chills (2%), two cases of fatigue (4%), and two 


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cases of hot flush (4%) were also attributed to CDX-1140; a single case of fatigue 
(2%) was also attributed to glembatumumab vedotin. The CDX-301 Investigator 
Brochure provides additional details. 
 
The safety, biological activity, and preliminary clinical activity of CDX-1140 as 
monotherapy and in combination with CDX-301 (FLT3 ligand) is being established 
in an ongoing phase I dose escalation and expansion trial (CDX1140-01; 
NCT03329950) whose interim results were presented at the 2019 AACR Annual 
Meeting. CDX-1140 is administered intravenously monthly, and CDX-301 is 
administered 75 μg/kg subcutaneously daily for 5 days the week prior to CDX-1140 
during cycles 1 and 2.  As of May 28th, 2020, a total of 89 patients have been 
administered CDX-1140, with 55 administered CDX-1140 monotherapy, 31 
administered CDX-1140 in combination with CDX-301, and 3 patients 
administered CDX-1140 in combination with pembrolizumab. The Maximum 
Tolerated Dose (MTD) of CDX-1140 was determined to be 1.5 mg/kg. To date in 
the CDX1140-01 trial, 23 patients have been administered CDX-1140 monotherapy 
at 1.5 mg/kg, and 10 have been administered CDX-1140 at 1.5 mg/kg in 
combination with CDX-301. 
 
Although not the primary objective of the study, evidence of anti-tumor activity has 
been observed, with an unconfirmed iRECIST partial response in a patient with 
gastroesophageal adenocarcinoma, treated with CDX-1140 + CDX-301. In 
addition, 2 patients with HNSCC who received CDX-1140 monotherapy have had 
early evidence of an anti-tumor effect with, cavitation and/or necrosis of lesions on 
CT scan.   
 
CDX-1140 is biologically active, with increases in serum cytokine and chemokines 
observed in the study, as well as increased activation markers on dendritic cells and 
B-cells.  Preliminary data indicates that CDX-301 increased the level of serum IL-
12p40. 
 
Most side effects associated with CDX-1140 have occurred in the 24-48 hours 
following the CDX-1140 infusion, consisted of infusion reactions/cytokine release 
syndromes, have been mild to moderate in severity, and have resolved with or 
without medications such as acetaminophen, NSAIDS, and/or anti-nausea 
medication. In a few cases, the side effects have been severe and have required 
hospitalization and treatment with corticosteroids or other immunosuppressive 
medications. Treatment related adverse events that have occurred in > 10% of 
patients are as follows: fatigue, joint pain, nausea, chills, fever, diarrhea, muscle 
pain, vomiting. Transient (usually low-grade) increases in liver transaminases have 
been seen in some patients, but no patient has had to discontinue therapy because 
of increased liver function tests. Cytokine release syndrome (including symptoms 
of fever, hypotension, hypoxia, fatigue, headache, and nausea) and pneumonitis 
have been the most common SAEs reported. Thus far, CDX-301 does not seem to 
add to the side effect profile of CDX-1140. The CDX-1140 Investigator Brochure 
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Our recommended phase II dose levels come from a phase I clinical trial that has 
established a MTD for CDX-1140 (Study CDX1140-01), as well as previous 
studies that have studied the MTD for CDX-301. These studies show the majority 
of potential toxicity comes CDX-1140, consistent with the mechanism of action of 
each drug.  
 
CDX-1140 is being studied in one clinical trial. The first in human (FIH) trial 
(Study CDX1140-01) is an open-label, non-randomized, multicenter, dose-
escalation study with expansion cohorts to evaluate the safety, tolerability, 
pharmacokinetics, pharmacodynamic, and clinical activity of intravenous CDX-
1140 as a monotherapy and in combination with subcutaneous CDX-301 (Flt3L) in 
patients with advanced solid tumors and hematologic malignancies.  
 
As of a cut-off date of 9/5/2019, a total of 58 patients have been treated; 41 with 
CDX-1140 monotherapy and 17 patients with CDX-1140 plus CDX-301 
combination therapy. The Maximum Tolerated Dose (MTD) and recommended 
dose and administration schedule for CDX-1140 monotherapy has been defined as 
1.5mg/kg every four weeks.   
 
CDX-301 and CDX-1140 had been used previously, alone and in combination, at 
the doses we are giving without grade 3 or higher AEs.  The combination has also 
been used safely in a dose escalation trial NCT03329950.  Few of these prior studies 
incorporated pancreatic cancer patients, which is why the first six patients on our 
study will be treated as phase I and assessed for potential toxicity.  
 
Initial studies examined the tolerability of CDX-301 alone. Using a standard 3+3 
dose-escalating design, sequential cohorts of 3–6 healthy volunteers received CDX-
301 by daily SC injection at a dose level of 1, 3, 10, 25 or 75 μg/kg for 5 days 
(Cohorts 1–5), 25 μg/kg for 7 days (Cohort 6) or 25 μg/kg for 10 days (Cohort 
7). Transient lymphadenopathy (Grade 1) was seen in six subjects (25 or 
75 μg/kg/day cohorts) and single cases of diarrhea, injection site erythema, 
folliculitis and dry mouth (all Grade 1) were observed. A single subject receiving 
CDX-301 at 75 μg/kg/day for 5 days developed community-acquired pneumonia 
on day 12. No other AE’s were seen.  
 
CDX-301 was given in a subsequent study (25 μg/kg) with a lower dose of RT (2 
Gy x 2) and another immune therapy without toxicity in lymphoma patients 
(Hammerich et al, Nat Med 2019).   
 
 Scientific Rationale for Study Design 
 
The key questions for these CDX-1140 and CDX-301 as anti-cancer agents in 
PDAC patients is what exactly their effects are on tumor infiltrating immune cells. 
While significant pre-clinical and modest clinical data are already present for both 
agents; Without fully understanding their effects in human PDAC tissues it is 


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difficult to predict the optimum ways to employ these agents.  In this study for our 
primary endpoint of changes in intratumoral cDCs we will compare to historical 
tissues and analysis of untreated PDAC patients. Thus, here-in we will simply run 
two arms testing CDX-1140 alone and CDX-301 plus CDX-1140.  
 
1.4 
Risk/Benefit Assessment 
 
 Known Potential Risks  
 
Evidence from mouse and human tolerability studies suggest the study drugs, at the 
doses we are using, have a safety profile supportive of its further development as 
an anti-cancer therapeutic.  
 
Treatment related adverse events that have occurred in > 10% of patients are as 
follows: fatigue, joint pain, nausea, chills, fever, diarrhea, muscle pain, and 
vomiting. Transient changes in liver function tests, platelet count, and lymphocyte 
count have been observed with CDX-1140. Transient increases in liver 
transaminases are expected in the 24-48 hours following the administration of 
CDX-1140. These changes have been mostly low grade and typically return to 
baseline within 1-2 week after the infusion. Important observed risks include 
cytokine release syndrome and pneumonitis. SQ and IV injections may lead to local 
discomfort or pain, and in some cases, infection.  
 
 Known Potential Benefits 
 
If the hypothesis of this study is correct, the experimental therapy will initiate a 
productive immune reaction against the tumor, locally and systemically, which may 
result in partial or complete tumor elimination and/or prevention of metastatic 
disease, however the validity of this hypothesis in humans is not currently known.  
 
Thus far preliminary results of the phase I study of CDX-1140 with CDX-301 have 
been reported in poster form, and show: 
 
• 1 unconfirmed iPR of 4 months duration in combination cohort (CDX-
1140 0.36 mg/kg) – see below 
• 6 patients with iSD; 4 in CDX-1140 monotherapy and 2 in CDX-1140 + 
CDX-301 with a duration of 1.8 months to 5.4 months; 1 iUPD  
in CDX-1140 + CDX301 with a duration of 10+ months 
• Of 62 patients, 38 patients with activity assessments (scans) available 
and 7 have response data pending  
 
Individual patients with encouraging responses are as follows: 


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While there are no established benefits, results from prior preclinical and clinical 
work are encouraging for the potential of benefit.   
 
 Assessment of Potential Risks and Benefits 
 
The benefit-risk assessment of CDX-1140 with CDX-301 should be taken in the 
context of a drug in the early stages of development, and therefore is by definition 
uncertain and evolving. In the early clinical experience to date, this therapy has 
demonstrated an acceptable toxicity profile with evidence of biologic and clinical 
activity consistent with the mechanism of action.  
 
In the best-case scenario, and that predicted by prior animal studies, the potential 
benefit of this therapy is tumor regression. In a population of patients that is 
overwhelmingly incurable, the potential risk benefit ratio appears very favorable.   
 
 


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2 
OBJECTIVES AND ENDPOINTS 
 
Objectives 
Endpoints 
Justification for 
Endpoints 
Primary 
To determine the amount of 
intratumor conventional 
dendritic cells in patients with 
resectable pancreatic cancer 
treated with neoadjuvant CDX-
1140 vs. patients with 
resectable pancreatic cancer 
treated with neoadjuvant CDX-
301 + CDX-1140. 
intratumoral cDCs in surgical 
tissues 
The immune therapy 
activates and increases the 
number of dendritic cells, 
which in mouse studies 
correlates with improved 
clinical outcome.  
Exploratory 
To report immunologic 
correlates in both groups 
before and after therapy. 
Immunologic correlates will be 
assessed by multiplex IHC, 
FACS, and CyTOF, performed 
on tumor tissue and blood. 
Global immune profiling by 
CyTOF, single cell RNASeq 
analysis, and histologic 
assessments,  
local control rate, distant 
metastasis-free survival, overall 
survival, margin negative 
resection rate. 
Immune correlates are 
important indicators of 
therapeutic effect, and may 
correlate with clinical 
response.  
To assess local control of 
resectable pancreatic cancer 
treated with neoadjuvant CDX-
1140 vs. resectable pancreatic 
cancer treated with 
neoadjuvant CDX-301 + CDX-
1140. 
To assess distant metastasis-
free survival of patients with 
resectable pancreatic cancer 
treated with neoadjuvant CDX-
1140 vs. resectable pancreatic 
cancer treated with 
neoadjuvant CDX-301 + CDX-
1140. 
To assess overall survival of 
patients with resectable 
pancreatic cancer treated with 
neoadjuvant CDX-1140 vs. 
resectable pancreatic cancer 
treated with neoadjuvant CDX-
301 + CDX-1140. 
To assess extent of resection in 
patients with resectable 


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pancreatic cancer treated with 
neoadjuvant CDX-1140 vs. 
resectable pancreatic cancer 
treated with neoadjuvant CDX-
301 + CDX-1140. 
To assess the safety and 
tolerability profile of CDX-
1140 vs. CDX-301 plus CDX-
1140 in surgically resectable 
pancreatic cancer patients. 
adverse events 
AE profile for this patient 
population. 
 
 
3 
STUDY POPULATION 
 
3.1 
Inclusion Criteria 
 
1. Histologically or cytologically confirmed surgically resectable pancreatic ductal 
adenocarcinoma, but not adenosquamous/squamous pancreas cancers (as determined 
by operating surgeon or tumor board).  Patients who have previously received 
chemotherapy for his/her pancreas cancer within the past 6 months and who are now 
deemed resectable are also eligible for this trial. 
 
2. At least 18 years of age. 
 
3. ECOG performance status ≤ 1 (see Appendix A) 
 
4. Normal bone marrow and organ function as defined below: 
a. Absolute neutrophil count ≥ 1,500 /cumm 
b. Platelets ≥ 100,000 /cumm 
c. Hemoglobin ≥ 9.0 g/dL 
d. AST(SGOT)/ALT(SGPT) ≤ 2.5 x IULN 
e. Creatinine clearance ≤ 1.5 x IULN or glomerular filtration rate of ≥ 60 mL/min 
f. INR ≤ 1.5 x IULN unless patient is receiving anticoagulant therapy as long as INR 
or PTT is within therapeutic range of intended use of anticoagulants 
g. aPTT ≤ 1.5 x IULN unless patient is receiving anticoagulant therapy as long as INR 
or PTT is within therapeutic range of intended use of anticoagulants 
h. Albumin ≥ 3.0mg/dL 
 
5. The effects of CDX-301 and CDX-1140 on the developing human fetus are unknown.  
For this reason, women of childbearing potential and men must agree to use adequate 
contraception (hormonal or barrier method of birth control, abstinence) prior to study 
entry, for the duration of study participation, and for 3 months after the last dose of 
either study drug.  Should a woman become pregnant or suspect she is pregnant while 
participating in this study or for 3 months after the last dose of either study drug, she 
must inform her treating physician immediately. 
 


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6. Ability to understand and willingness to sign an IRB approved written informed 
consent document (or that of legally authorized representative, if applicable). 
 
3.2 
Exclusion Criteria 
 
1. Immmune deficienties such as HIV. 
 
2. A history of other malignancy with the exception of malignancies for which all 
treatment was completed at least 2 years before registration and the patient has no 
evidence of disease. 
 
3. Currently receiving any other investigational agents or has received any other 
investigational agents within 4 weeks or 5 half-lives of the planned first dose of study 
treatment. 
 
4. Receipt of chemotherapy within 2 weeks of planned first dose of study treatment. 
 
5. A history of allergic reactions attributed to compounds of similar chemical or biologic 
composition to CDX-301 or CDX-1140 or other agents used in the study. 
 
6. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy 
(for > 1 month of 10 mg prednisone daily, or equivalent) or any other form of 
immunosuppressive therapy not routinely associated with chemotherapeutic regimen. 
 
7. Uncontrolled intercurrent illness including, but not limited to, ongoing or active 
infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac 
arrhythmia, immunosuppression, autoimmune conditions, or underlying pulmonary 
disease. 
 
8. Uncontrolled intercurrent illness including, but not limited to, ongoing or active 
infection, immunosuppression, autoimmune conditions, or underlying pulmonary 
disease. 
 
9. Has an autoimmune disease requiring systemic treatment within the past 2 years (i.e. 
with use of disease modifying agents, corticosteroids, or immunosuppressive drugs).  
Replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid 
replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form 
of systemic treatment. 
 
10. Known history of hepatitis B (defined as hepatitis B surface antigen [HBsAg] reactive) 
or known active hepatitis C virus (defined as HCV RNA [qualitative] is detected). 
 
11. Has a history of (non-infectious) pneumonitis that required steroids or current 
pneumonitis. 
 
12. Has a known history of active TB (bacillus tuberculosis). 


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13. Major surgery within 28 days prior to the first study treatment. 
 
14. Pregnant and/or breastfeeding.  Women of childbearing potential must have a negative 
pregnancy test within 14 days of study entry. 
 
15. History of bone marrow or solid organ transplant.  
 
16. Patients with a history of myocardial infarction, cerebral vascular accident, thrombosis 
or pulmonary embolus within 12 months prior to the first dose of study treatment are 
excluded from this study. 
 
17. Patients with known mutations/amplifications in Flt3 
 
3.3 
Inclusion of Women and Minorities 
 
Both men and women and members of all races and ethnic groups are eligible for this trial.  
 
 
4 
REGISTRATION PROCEDURES 
 
Patients must not start any protocol intervention prior to registration through the Siteman 
Cancer Center. 
 
The following steps must be taken before registering patients to this study: 
 
1. Confirmation of patient eligibility 
2. Registration of patient in the Siteman Cancer Center database 
3. Assignment of unique patient number (UPN) 
 
4.1 
Confirmation of Patient Eligibility 
 
Confirm patient eligibility by collecting the information listed below: 
 
1. Registering MD’s name 
2. Patient’s race, sex, and DOB 
3. Three letters (or two letters and a dash) for the patient’s initials 
4. Copy of signed consent form 
5. Completed eligibility checklist, signed and dated by a member of the study team 
6. Copy of appropriate source documentation confirming patient eligibility 
 
4.2 
Patient Registration in the Siteman Cancer Center OnCore Database 
 
All patients must be registered through the Siteman Cancer Center OnCore database. 
 
 


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4.3 
Assignment of UPN 
 
Each patient will be identified with a unique patient number (UPN) for this study.  All data 
will be recorded with this identification number on the appropriate CRFs. 
 
4.4 
Screen Failures 
 
Screen failures are defined as participants who consent to participate in the clinical trial 
but are not subsequently randomized to the study intervention or entered in the study.  A 
minimal set of screen failure information is required to ensure transparent reporting of 
screen failure participants, to meet the Consolidated Standards of Reporting Trials 
(CONSORT) publishing requirements and to respond to queries from regulatory 
authorities.  Minimal information includes demography, screen failure details, eligibility 
criteria, and any serious adverse event (if applicable).   
 
4.5 
Strategies for Recruitment and Retention 
 
All patients with pancreatic cancer are discussed in our weekly multidisciplinary tumor 
board and clinical trial options are reviewed. WUSM department of surgery preforms 
greater than 100 pancreatic cancer resections per year. Many of these patients would be 
eligible for this trial. We anticipate an accrual rate of approximately 15 patients per year. 
To have outreach meetings in the community to explain the radiation therapy and clinical 
trial options available at Washington University. We will accrue without respect to race, 
gender or socioeconomic background. 
 
4.6 
Measures to Minimize Bias:  Randomization 
 
Consenting and eligible patients will be randomized on a 1:1 basis to receive CDX-1140 
followed by surgery or CDX-301 + CDX-1140 followed by surgery until 12 patients 
evaluable for the primary objective have been randomized to each arm.  The randomization 
table will be generated by the statistician using a statistical software and will be uploaded 
to REDCap to randomize patients. 
 
 
5 
TREATMENT PLAN 
 
5.1 
Premedication Administration 
 
 CDX-1140 
 
Prophylactic premedication is required for all patients: diphenhydramine 25/50 mg 
(or equivalent anti-histamine), 500 to 750 mg paracetamol (acetaminophen), and 
naproxen sodium 250 mg (or equivalent NSAID) at least 30 minutes prior to CDX-
1140 administrations. Ranitidine 150 mg (or equivalent) may also be incorporated 
into the premedication regimen.  Prophylactic premedication with corticosteroids 


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is to be avoided because of the potential to attenuate the anti-tumor activity of 
CDX-1140.  
 
CDX-1140 will be administered intravenously over 90 minutes using a 0.22 micron 
in-line filter. 
 
CDX-1140 post-infusion medication is also required for all patients.  In the 24-48 
hours following the CDX-1140 infusion, alternate oral acetaminophen (1000 mg) 
and non-steroidal anti-inflammatory (e.g., ibuprofen 200 mg) q6H. An anti-
histamine and anti-emetic may also be utilized if clinically indicated.  Patients 
should be evaluated to determine if continuation of post-infusion medication is 
needed on the day after CDX-1140 dosing. Note that the potential for toxicity with 
these drugs and appropriate precaution should be utilized in patients with risk 
factors for toxicity, e.g. patients with peptic ulcers, increased LFTs, or increased 
creatinine. Also, care should be taken to medicate for no longer than is necessary 
in order to avoid potential confounding factors in determining adverse event 
causality (e.g. increased LFTs). 
 
All patients should be monitored for 4 to 6 hours post administration of CDX-1140 
with standard post-infusion monitoring. 
 
 CDX-301 
 
Injection site reactions have been infrequent and mild with CDX-301. Pre-
medication with diphenhydramine has been reported to be effective in the 
prevention of pruritic and erythemic reactions and may be considered for subjects 
who experience local reactions after treatment with CDX-301. Injection site 
reactions may also be treated with analgesics (i.e., Tylenol). If there is injection site 
pain, a numbing cream such as Emla cream can be used prior to administration of 
CDX-301. 
 
5.2 
Study Intervention Administration 
 
Patients randomized to the CDX-1140 monotherapy arm will receive a single IV infusion 
at a dose of 1.5 mg/kg, with surgery to follow 7-12 days after administration of CDX-1140. 
 
Patients randomized to the CDX-301 + CDX-1140 arm will receive CDX-301 at 75 
mcg/kg/day as a subcutaneous injection every day for 5 days (Days 1-5) with CDX-1140 
IV at 1.5 mg/kg on Day 8.  Patients will be required to be present in clinic for each injection. 
Surgery will be 7-12 days after administration of CDX-1140. 
 
5.3 
Definitions of Evaluability 
 
Patients must undergo collection of blood and tissue at the time of resection in order to be 
evaluable for the primary objective of determining amount of intratumor cDC.  Patients 
who are not evaluable for the primary objective will not count towards analysis of this 


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objective and will be replaced. However, these patients will continue on study/in follow-
up to be followed for toxicity and local control, DMFS, and OS regardless of whether they 
had resection. 
  
All patients who receive any study treatment are evaluable for the exploratory objective of 
safety and tolerability.  Patients are evaluated from first receiving study treatment until 
time of resection, or until 60 days after end of treatment if resection doesn’t take place. 
 
In order to be evaluable for the exploratory objective evaluating immunologic correlates, 
patients must have blood and tissue collected before and after therapy. 
 
In order to be evaluable for the exploratory objectives of assessing local control, DMFS, 
and OS, patients must have received at least one dose of study treatment. 
 
In order to be evaluable for the exploratory objective of assessing extent of resection, 
patient must have received at least one dose of study treatment and undergone resection. 
 
5.4 
Concomitant Therapy and Supportive Care Guidelines 
 
The investigational drugs are not known or predicted to interact with other drugs, and are 
not broken down by CYP enzymes.  
 
Infusion reactions may occur when giving any IV medication. Recommendations for the 
management of peri-infusional reactions are provided below and may be modified based 
on local treatment standards and guidelines, as appropriate. Infusion reactions should be 
graded according to NCI-CTCAE guidelines, http://ctep.cancer.gov. Obtain serum at the 
time of an infusion reaction.  
 
For Grade 1 symptoms: (Mild transient reaction; infusion interruption not indicated; 
intervention not indicated)  
 
Remain at bedside and monitor patient until recovery from symptoms.  
 
For Grade 2 symptoms: (infusion interruption indicated but responds promptly to 
symptomatic treatment [e.g., antihistamines, nonsteroidal anti-inflammatory drugs, 
narcotics, corticosteroids, i.v. fluids]; prophylactic medications indicated for ≤ 24 hours)  
 
Stop the CDX-1140 infusion, begin an i.v. infusion of normal saline, and treat the patient 
with diphenhydramine 50 mg i.v. (or equivalent) and/or 500 to 1000 mg 
paracetamol/acetaminophen; remain at bedside and monitor patient until resolution of 
symptoms. Corticosteroid therapy may also be administered as appropriate. If the infusion 
is interrupted, then restart the infusion at 50% of the original infusion rate when symptoms 
resolve; if no further complications ensue after 30 minutes, the rate may be increased to 
100% of the original infusion rate. Monitor patient closely. If symptoms recur then no 
further CDX-1140 will be administered at that visit. The amount of study drug infused 
must be recorded on the case report form (CRF). Patients who experience an adverse event, 


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including an infusion reaction of Grade 2, during the 4-6 hour observation period that does 
not resolve during this time should be observed for 24 hours or until the adverse event 
resolves with vital sign measurements every 4 hours and additional evaluations as 
medically indicated for the management of the adverse event.  
 
For Grade 3 or Grade 4 symptoms: (Grade 3: prolonged [i.e., not rapidly responsive to 
symptomatic medication and/or brief interruption of infusion]; recurrence of symptoms 
following initial improvement; hospitalization indicated for other clinical sequelae [e.g., 
renal impairment, pulmonary infiltrates]. Grade 4: life-threatening consequences; urgent 
intervention indicated).  
 
Immediately discontinue infusion of CDX-1140. Begin an i.v. infusion of normal saline, 
and treat the patient as follows: Recommend bronchodilators, epinephrine 0.2 to 1 mg of a 
1:1,000 solution for subcutaneous administration or 0.1 to 0.25 mg of a 1:10,000 solution 
injected slowly for i.v. administration, and/or diphenhydramine 50 mg i.v. with 
methylprednisolone 100 mg i.v. (or equivalent), as needed. Patient should be monitored 
until the Investigator is comfortable that the symptoms will not recur. Investigators should 
follow their institutional guidelines for the treatment of anaphylaxis. Patients who 
experience an infusion reaction of Grade ≥ 3, regardless of resolution, will be observed for 
24 additional hours or until the adverse event resolves with vital sign measurements every 
4 hours and additional evaluations as medically indicated for the management of the 
adverse event. In the case of late-occurring hypersensitivity symptoms (e.g., appearance of 
a localized or generalized pruritus within 1 week after treatment), symptomatic treatment 
may be given (e.g., oral antihistamine, or corticosteroids). CDX-1140 will be permanently 
discontinued for patients with Grade 4 infusion reactions or Grade 3 infusion reactions 
lasting more than 6 hours.  
 
5.5 
Women of Childbearing Potential 
 
Women of childbearing potential (defined as women with regular menses, women with 
amenorrhea, women with irregular cycles, women using a contraceptive method that 
precludes withdrawal bleeding, and women who have had a tubal ligation) are required to 
have a negative serum or urine pregnancy test within 14 days prior to the first day of study 
treatment.  
 
Female and male patients (along with their female partners) are required to use two forms 
of acceptable contraception, including one barrier method, during treatment with the 
investigational agents.  
 
If a patient is suspected to be pregnant, the study agent should be immediately 
discontinued.  In addition, a positive urine test must be confirmed by a serum pregnancy 
test.  If it is confirmed that the patient is not pregnant, the patient may resume dosing. 
 
If a female patient or female partner of a male patient becomes pregnant during therapy 
with the study agent or 3 months thereafter, the investigator must be notified in order to 
facilitate outcome follow-up. 


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5.6 
Duration of Therapy 
 
If at any time the constraints of this protocol are considered to be detrimental to the 
patient’s health and/or the patient no longer wishes to continue protocol therapy, the 
protocol therapy should be discontinued and the reason(s) for discontinuation documented 
in the case report forms. 
 
Treatment may also be discontinued early for the following reasons: 
• Documented and confirmed disease progression 
• Death 
• Adverse event(s) that, in the judgment of the investigator, may cause severe or 
permanent harm or which rule out continuation of study drug 
• General or specific changes in the patient’s condition render the patient unable to 
receive further treatment in the judgment of the investigator 
• Suspected pregnancy 
• Serious non-compliance with the study protocol 
• Lost to follow-up 
• Patient withdraws consent 
• Investigator removes the patient from study 
• The Siteman Cancer Center decides to close the study 
 
Patients who prematurely discontinue treatment for any reason will still be followed as 
indicated in the study calendar. 
 
5.7 
Duration of Follow-up 
 
Patients will be followed every  6 months for 2 years or until death, whichever occurs first.  
Patients removed from study for unacceptable adverse events will be followed until 
resolution or stabilization of the adverse event. 
 
5.8 
Lost to Follow-Up 
 
A participant will be considered lost to follow-up if he or she fails to return for three 
scheduled visits and is unable to be contacted by the study team. 
 
The following actions must be taken if the participant fails to return to clinic for a required 
study visit: 
o The study team will attempt to contact the participant and reschedule the missed 
visit within 1 week and counsel the participant on the importance of maintaining 
the assigned visit schedule and ascertain if the participant wishes to and/or should 
continue in the study. 
o Before a participant is deemed lost to follow-up, the investigator or designee will 
make every effort to regain contact with the participant (where possible, 3 telephone 
calls and, if necessary, a certified letter to the participant’s last known mailing 


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address).  These contact attempts should be documented in the participant’s medical 
record or study file. 
o Should the participant continue to be unreachable, he or she will be considered to 
have withdrawn from the study with a primary reason of lost to follow-up. 
 
5.9 
Protocol Stopping Criteria 
 
The principal investigator will closely monitor and analyze study data as they become 
available and will make determinations regarding the presence and severity of adverse 
events. The administration of study injections and new enrollments will be halted and the 
QASMC promptly notified if any of the following events occurs: 
 
1. One (or more) subject(s) experiences a Grade 3 or 4 adverse event that is classified 
as probably or definitely related to treatment with CDX-301 or CDX-1140; this 
excludes Grade 3 arthralgia and myalgia that has been adequately treated with a 
short course of steroids. 
 
2. One (or more) subject(s) experiences a SAE that is classified as probably or 
definitely related to treatment with CDX-301 or CDX-1140;  
3. Two (or more) subjects experience the same Grade 2 or higher adverse event  that 
is classified as probably or definitely related to study treatment: this criterion 
applies to cytokine-release syndrome, infusion-related reactions, laboratory 
abnormalities or other clinical adverse experiences. This excludes adverse events 
of arthralgia and myalgia that have been adequately treated with a short course of 
steroids. 
4. Any other observation occurs that in the opinion of the PI results in a 
recommendation to halt enrollment. 
 
If one of these events does occur, study enrollments would only resume if review of the 
adverse events that caused the halt resulted in a recommendation to permit further study 
treatment and study enrollments. 
 
 
6 
DOSE DELAYS/DOSE MODIFICATIONS 
 
Dosing interruptions are permitted in the case of medical / surgical events or logistical reasons not 
related to study therapy (e.g., elective surgery, unrelated medical events, patient vacation, and/or 
holidays). Subjects should be placed back on study therapy within 4 weeks of the scheduled 
interruption, at PI discretion. A hold longer than 4 weeks will be allowed at PI discretion.  
 
There will be no dose modifications for CDX-1140 as it is given as a single dose.   
 
CDX-301 will be discontinued for any grade 3 and grade 4 events that are deemed at least possibly 
related to it. If discontinued, the patient may still remain on study.  Any missing doses are made 
up, if feasible.  Since this is an immune therapy and the dose-response relationship is not likely to 
be linear, the therapy will be held rather than dose reduced for patients experiencing an AE.    


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Toxicity 
Possibly, probably or 
definitely attributed to 
CDX-301 
Treatment Interruption and Dose Reduction Instructions 
Lymphadenopathy 
No treatment modification, since lymphadenopathy is not 
dangerous or indicative of a poor outcome.  
Injection site erythema 
No treatment modification. Rotate injection site. Treat with 
topical antibiotic ointment.  
Folliculitis 
No treatment modification. Treat with topical antibiotic 
ointment. 
Dry mouth 
No treatment modification.  
Other holds and modifications may be made at the discretion of the PI. 
 
 
7 
REGULATORY AND REPORTING REQUIREMENTS 
 
The entities providing oversight of safety and compliance with the protocol require reporting as 
outlined below.  Please refer to Appendix B for definitions and Appendix C for a grid of reporting 
timelines. 
 
Adverse events will be tracked from start of treatment through time of surgery (or 60 days after 
end of treatment if surgery doesn’t take place).  All adverse events must be recorded on the toxicity 
tracking case report form (CRF) with the exception of: 
• Baseline adverse events, which shall be recorded on the medical history CRF 
 
Refer to the data submission schedule in Section 10.0 for instructions on the collection of AEs in 
the EDC. 
 
Reporting requirements for Washington University study team may be found in Section 7.1.   
 
7.1 
Sponsor-Investigator Reporting Requirements 
 
 Reporting to the Human Research Protection Office (HRPO) at 
Washington University 
 
Reporting will be conducted in accordance with Washington University IRB 
Policies. 
 
Pre-approval of all protocol exceptions must be obtained prior to implementing the 
change. 
 
 Reporting to the Quality Assurance and Safety Monitoring Committee 
(QASMC) at Washington University 
 


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The Washington University Sponsor-Investigator (or designee) is required to notify 
the QASMC of any unanticipated problems involving risks to participants or others 
occurring at WU or any BJH or SLCH institution that has been reported to and 
acknowledged by HRPO.  (Unanticipated problems reported to HRPO and 
withdrawn during the review process need not be reported to QASMC.) 
 
QASMC must be notified within 10 days of receipt of IRB acknowledgment via 
email to qasmc@wustl.edu.  Submission to QASMC must include the myIRB form 
and any supporting documentation sent with the form. 
 
 Reporting to Celldex Therapeutics 
 
Any serious adverse event (SAE) or follow-up to an SAE, including death due to 
any cause other than progression of the cancer under study, whether or not related 
to study drug, must be reported to Celldex Therapeutics within 1 business day. 
 
The investigator must inform Celldex Therapeutics in writing using a MedWatch 
3500a form of any SAE within 24 hours of the investigator becoming aware of the 
event.  The initial report must be as complete as possible, including an assessment 
of the causal relationship between the event and the investigational product(s), if 
available.  Information not available at the time of the initial report (e.g., an end 
date for the adverse event or laboratory values received after the report) must be 
documented on a follow-up report. 
 
“Adverse Event” or “AE” shall mean any untoward medical occurrence in a study 
subject who is administered the Study Drug regardless of whether or not a causal 
relationship with the Study Drug exists.  By way of example and without limitation, 
an AE can be any unfavorable and unintended sign (for example, an abnormal 
laboratory finding), symptom, or disease temporally associated with the use of the 
Study Drug. 
  
Celldex Therapeutics, Inc., considers an SAE to be any adverse event that is life-
threatening or that results in any of the following outcomes: death; inpatient 
hospitalization or prolongation of existing hospitalization; persistent or significant 
disability/incapacity; or a congenital anomaly/birth defect. 
 
“Suspected Unexpected Serious Adverse Reaction” or “SUSAR” shall mean any 
Serious Adverse Event, the nature, severity or frequency of which is not consistent 
with information in the most current investigator’s brochure.  
 
Elective or previously scheduled hospitalizations for pre-existing conditions that 
have not worsened after initiation of treatment should not be classified as SAEs.  
For example, an admission for a previously scheduled hernia repair would not be 
classified as an SAE. 
 
Completed SAE reports are to be submitted to: 


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Celldex Therapeutics, Inc. 
Pharmacovigilance 
Hotline: 908-323-2233 
Fax No.: 781-644-6434 
Email: SAE@celldex.com  
 
7.1.3.1 Reporting Pregnancy 
 
Pregnancy per se is not considered an AE unless there is cause to believe 
that the study drug may have interfered with the effectiveness of a 
contraceptive medication or if the outcome of the pregnancy meets SAE 
criteria (miscarriage or congenital anomaly/birth defect), it should be 
reported as an SAE.  Hospitalization for normal delivery of a healthy 
newborn is not an SAE.   
 
Each pregnancy that occurs in female subjects or female partners of male 
subjects while on the study drug or within three months following 
completion of the study drug must be reported to the Celldex within 24 
hours of the Investigator becoming aware of its occurrence.  If a subject 
becomes pregnant, drug administration must be discontinued immediately.  
The pregnancy should be followed up to determine outcome (including 
spontaneous or voluntary termination), details of the birth, and the presence 
or absence of any birth defects, congenital abnormalities, or maternal or 
newborn complications.  Follow-up and documentation must occur even if 
the subject withdraws from the study or the study is completed.  Every effort 
should be made to gather information regarding the pregnancy outcome 
until 8 weeks postpartum.  It is the responsibility of the Investigator to 
obtain all pregnancy information. 
 
 Reporting to the FDA 
 
The conduct of the study will comply with all FDA safety reporting requirements.  
PLEASE NOTE THAT REPORTING REQUIREMENTS FOR THE FDA 
DIFFER FROM REPORTING REQUIREMENTS FOR HRPO/QASMC.  It 
is the responsibility of the Washington University Sponsor-Investigator to report to 
the FDA as follows: 
 
• Report any unexpected fatal or life-threatening suspected adverse reaction 
(refer to Appendix B for definitions) no later than 7 calendar days after 
initial receipt of the information.   
• Report a suspected adverse reaction that is both serious and unexpected 
(SUSAR, refer to Appendix B) no later than 15 calendar days after it is 
determined that the information qualifies for reporting.  Report an adverse 
event (refer to Appendix B) as a suspected adverse reaction only if there is 
evidence to suggest a causal relationship between the drug and the adverse 
event, such as: 


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o A single occurrence of an event that is uncommon and known to be 
strongly associated with drug exposure 
o One or more occurrences of an event that is not commonly associated 
with drug exposure but is otherwise uncommon in the population 
exposed to the drug 
o An aggregate analysis of specific events observed in a clinical trial that 
indicates those events occur more frequently in the drug treatment 
group than in a concurrent or historical control group 
• Report any findings from epidemiological studies, pooled analysis of 
multiple studies, or clinical studies that suggest a significant risk in humans 
exposed to the drug no later than 15 calendar days after it is determined 
that the information qualifies for reporting. 
• Report any findings from animal or in vitro testing that suggest significant 
risk in humans exposed to the drug no later than 15 calendar days after it 
is determined that the information qualifies for reporting.  
• Report any clinically important increase in the rate of a serious suspected 
adverse reaction of that listed in the protocol or IB within 15 calendar days 
after it is determined that the information qualifies for reporting. 
 
Submit each report as an IND safety report in a narrative format or on FDA Form 
3500A or in an electronic format that FDA can process, review, and archive.  Study 
teams must notify the Siteman Cancer Center Protocol Development team of each 
potentially reportable event within 1 business day after initial receipt of the 
information, and must bring the signed 1571 and FDA Form 3500A to the Siteman 
Cancer Center Protocol Development team no later than 1 business day prior to the 
due date for reporting to the FDA. 
 
Each notification to FDA must bear prominent identification of its contents (“IND 
Safety Report”) and must be transmitted to the review division in the Center for 
Drug Evaluation and Research (CDER) or in the Center for Biologics Evaluation 
and Research (CBER) that has responsibility for review of the IND.  Relevant 
follow-up information to an IND safety report must be submitted as soon as the 
information is available and must be identified as such (“Follow-up IND Safety 
Report”).  
 
7.2 
Exceptions to Expedited Reporting 
 
Events that do not require expedited reporting as described in Section 7.1 include: 
• planned hospitalizations 
• hospitalizations < 24 hours 
• respite care 
• events related to disease progression 
 
Events that do not require expedited reporting must still be captured in the EDC. 
 
 


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8 
PHARMACEUTICAL INFORMATION 
 
8.1 
CDX-301 
 
 CDX-301 Description 
 
CDX-301 is recombinant human Flt3L, which stimulates dendritic cell 
development.  More specifically, CDX-301 is a soluble glycoprotein, which, after 
the leader sequence has been cleaved off, consists of 153 amino acids representing 
most of the protein’s extracellular domain except for the C-terminal three amino 
acids, 
and 
whose 
calculated 
molecular 
weight 
is 
17,445 
kD 
(C777H1224N213O229S8). It exists as numerous isoforms, some of which are 
separated by isoelectric focusing in the pI range of 3.5 to 5.5. There are two N-
glycosylation sites (N100 and N123), which are partially occupied by complex 
carbohydrate structures and five O-glycosylation sites (S136, S137, T138, S144 
and T151), three of which are always occupied.  
 
CDX-301 drug product is formulated as a sterile solution intended for single-use 
parenteral administration. Each vial contains a nominal 2.5 mg/mL CDX-301 
protein in a 1 mL volume of buffered solution composed of sodium phosphate and 
sodium chloride, with a pH of 7.0.  
 
 Pharmacokinetics and Drug Metabolism 
 
CDX-301 half life, efficacy and safety of CDX-301, recombinant human Flt3L, at 
expanding dendritic cells and hematopoietic stem cells in healthy human volunteers 
has been reported 41 and is shown in breif below.  
 
 


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 Supplier(s) 
 
The drug will be supplied free of charge by Celldex. 
 
 Dosage Form and Preparation 
 
CDX-301 is formulated as an injectable solution, for SQ administration.  CDX-301 
vials should not be shaken. CDX-301 liquid should be withdrawn from vial gently, 
avoiding foaming and excess shearing. CDX-301 should be used as soon as possible 
once drawn into a syringe within 4 hours). Each CDX-301 vial is single use only. 
Partially used vials or solutions must not be used to prepare another dose and 
instead should be handled for destruction according to the study sites’ regulations 
for the disposal of biological agents. CDX-301 is injected subcutaneously using 
standard procedures, in either abdominal or gluteal subcutaneous tissue.   
 
 Storage and Stability 
 
CDX-301 will be stored in a refrigerator at 2 to 8°C and protected from light. CDX-
301 should not be frozen. 
 
 Administration 
 
Patients should be given CDX-301 SQ, in either the stomach or gluteal 
subcutaneous tissue.  The injection can be performed any time during the day, but 
preferably will be given at roughly the same time each day.  
 
 Special Handling Instructions 
 
No special handling instructions. 
 
8.2 
CDX-1140 
 
 CDX-1140 Description 
 


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CDX-1140 is an agonistic antibody against CD40.  Specifically, CDX-1140 is a 
recombinant fully human IgG2 anti-CD40 mAb generated by in vitro Chinese 
Hamster Ovary (CHO) cell culture and using standard mAb purification processes. 
The product is composed of two identical pairs of polypeptide chains, each pair 
having one fully-human kappalight (23,227 Da) and one fully-human IgG2 heavy 
chain (49,172 Da). The heavy and light chains expected molecular weights are 
based on the amino acid sequence of each chain. The N-terminal amino-acid 
sequences of the variable regions have been confirmed by sequence analysis.  
 
No animal-derived raw materials are used during the cell culture, purification, and 
formulation of the drug substance. A low pH step and a nanofiltration step are used 
for virus inactivation and reduction. Testing for adventitious agents is performed in 
accordance to the Food and Drug Administration (FDA) Points to Consider in the 
Manufacture and Testing of Monoclonal Antibody Products for Human Use (1997).  
 
The Drug Product manufacturing process consists of sterile filtration (2 x 0.22 μm 
filters in series) of the CDX-1140 formulated bulk Drug Substance, aseptic filling 
into Type 1 vials, stoppering with gray butyl stoppers, and capped with 
polypropylene flip-off caps. Each vial contains a nominal 3.0 mg/mL CDX-1140 
protein in a 10.0 mL volume of buffered solution composed of sodium phosphate, 
potassium phosphate, potassium chloride, sodium chloride, and Polysorbate 80, 
with a pH of 7.0.  
 
The final Drug Product dosage form is provided in a 10-mL Type 1 vial with a gray 
butyl stopper and a polypropylene flip-off cap, containing a sterile, single-use liquid 
with a nominal 3.0 mg/mL of CDX-1140 to be used for intravenous administration. 
The drug product vials are stored at ≤ - 65°C (-85°F). The CDX-1140 formulated 
drug substance and drug product are identical in terms of formulation and 
concentration.  
 
 Pharmacokinetics and Drug Metabolism 
 
CDX-1140 has previously been described: Vitale et al, Cancer Immunol 
Immunother 2019 42 
 
(https://link.springer.com/article/10.1007%2Fs00262-018-2267-0).  
 
Summary of Nonclinical Findings  
CDX-1140 is an agonist anti-CD40 human IgG2κ mAb being developed as a cancer 
therapeutic. The main findings from the in vitro pharmacology studies are as 
follows:  
• 
CDX-1140 bound specifically to human CD40 with high affinity but not to 10 
TNFRSF members with the closest homology to CD40.  
• 
CDX-1140 does not block CD40 ligand (CD40L) binding to CD40.  
• 
CDX-1140 bound to human and cynomolgus macaque CD40.  


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• 
CDX-1140 activated CD40 signaling in a CD40-expressing HEK-293 NF- kB 
reporter cell line in vitro.  
• 
CDX-1140 promoted B cell activation in vitro as measured by proliferation, 
upregulation of activation markers CD86 and HLA-DR, and induction of IL-
12p40 production by dendritic cells (DCs).  
• 
Based on in vitro B cell and DC activation, the MABEL is estimated to be 
approximately 0.004 mg/kg for CDX-1140.  
• 
CDX-1140 agonist activity is independent of Fc receptor (FcR) interactions.  
• 
Prolonged incubation (6 days) of human peripheral blood mononuclear cells 
(PBMCs) with CDX-1140 led to the accumulation of various cytokines and 
chemokines, most prominently TNF-α, MIP-1α, and MIP-1β, with lower levels 
of IL-1RA, IL-6, and IL-10. Depletion of CD14+ monocytes, but not B cells, 
eliminated the production of TNF-α.  
• 
CDX-1140 was assessed for the capacity to induce cytokines in whole blood 
from healthy human donors when added in soluble form, or adsorbed to 
microtiter plates from wet solution, or adsorbed to microtiter plates by drying 
down completely. Overall, very little specific cytokine induction was observed 
with CDX-1140 relative to the human IgG2 isotype control under any 
condition, although donor to donor variability was observed with some 
activation greater than the negative control.  
• 
CDX-1140 upregulated CD95 on Ramos lymphoma cells and the addition of 
CD40L enhanced the CD95 expression when combined with suboptimal lower 
CDX-1140 concentrations. A similar synergy was observed between CDX-
1140 and CD40L in DC and B cell activation assays.  
• 
CDX-1140 was compared in vitro to CP*, an mAb having the same amino acid 
sequence as CP-870,893, an agonist anti-CD40 IgG2 mAb in clinical 
development by Roche. CDX-1140 was similar, though generally lower 
compared to CP* in the upregulation of CD86 on B cells and induction of IL-
12p40 by DC.  
• 
The main findings from the in vivo pharmacology studies are as follows:  
• 
CDX-1140 significantly increased the duration of survival of severe combined 
immunodeficiency (SCID) mice implanted subcutaneously with human B cell 
lymphoma Daudi, Ramos or Raji cells.  
• 
When Ramos lymphoma cells were co-implanted with human PBMCs in SCID 
mice, the survival of the mice was extended further compared to the absence of 
added PBMCs, suggesting a contribution from immune responses.  
 
Effects of on peripheral blood immune cells have been preliminarily examined, as 
shown below.   


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Effects on pro-inflammatory cytokines have been examined, as shown below:  
 


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 Supplier(s) 
 
The drug will be supplied free of charge by Celldex. 
 
 Dosage Form and Preparation 
 
CDX-1140 is formulated as an injectable solution, for IV administration.  The 
morning that a patient is due for treatment, research personnel will remove a vial 
from the -85°F freezer and place it in the refrigerator at 2-8 degrees °C.  When a 
patient arrives for treatment, research personnel will remove the vial and deliver it 
to the patient’s treatment location. After equilibration to room temperature and 
before use, the vial should be gently swirled (but not inverted or shaken) to ensure 
uniform mixing of the contents. Solution should be gently withdrawn (avoiding 
foaming and excess shearing). Once the sterile vials are entered (i.e., once CDX-
1140 is drawn into a syringe), the drug should be used as soon as possible (typically 
within 3 hours if kept at room temperature or within 6 hours if refrigerated; or in 
accordance with any applicable institutional guidance). The infusion should take 
place at a standard rate appropriate for the type of IV access, lasting between 1-15 
minutes.  
 
 Storage and Stability 
 
Vials of CDX-1140 are shipped in insulated shippers and must be stored at ≤ - 65°C 
(-85°F) until use and protected from light – storage at -85°F will be done by the 
primary investigators. The day of treatment, CDX-1140 can be stored at room 
temperature for up to 3 hours, or refrigerated (at 2-8 degrees) for up to 6 hours if 
necessary.   
 
 Administration 
 


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Each vial to be used for intravenous administration contains a premixed solution, 
containing 3.0 mg/mL CDX-1140 protein in a 10.0 mL volume of buffered solution.  
Injections can be performed through any standard IV method (peripheral IV, PICC, 
PORT, or any other IV access that is in place or most convenient for the patient).  
Patients should be given CDX-1140 IV once per month.  
 
 Special Handling Instructions 
 
No special handling instructions. 
 
 
9 
CORRELATIVE STUDIES 
 
9.1 
Fresh Tumor Tissue 
 
 Collection of Specimen  
 
Tumor tissue will be collected at the time of surgical resection. Tissue received 
from the OR is brought to the pathology processing table.  At this point, the tissue 
is sectioned and “bread loaved” by a pathologist.  Current best practice for 
correlative studies will take a central plane cross-section from the tumor if not 
interfering with clinical pathological assessments.  Tumor tissue will then be 
transported to the research labrotory on wet ice in DMEM media. A smaller portion 
(~20% of available biomarker tissue) will directly cryopreserved in liquid N2 or on 
dry ice.  
 
Processing labrotory is located at BJCIH 7th floor, room 7202 (DeNardo-lab). 
 
 Handling of Specimen(s) 
 
Tumor tissues will be divided into two pieces. Twenty percent of tissue will be 
directly cryopreserved in liquid N2 or on dry ice, while eighty percent of the tissue 
will be placed in DMEM Media in wet ice.  Samples will be transported on wet and 
dry ice to the research labrotory for processing. Research processing laboratory is 
located at BJCIH 7th floor, room 7202 (DeNardo-lab). 
 
9.2 
Archived Tumor Tissue 
 
Archival tissue will be retrieved from pathology thru the SCC request system.  This will 
also be used to inspect potential sampling biases or problems. 
 
9.3 
Research Blood 
 
Blood will be collected at three time points: 
• At screening 
• Prior to first therapeutic dose of CDX-1140, on the day of infusion 


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• At the time of surgery. 
 
For each blood collection three 10ml green-top (sodium heparin) tubes will be collected 
for PBMCs and plasma along with one red-top sera (no-anticoagulant) tubes. Samples will 
be transported on wet ice to the research laboratory for processing.  
 
Processing laboratory is located at BJCIH 7th floor, room 7202 (DeNardo-lab). 
 
Additionally, no more than 10 mL of blood will be collected at any standard follow-up 
visit to analyze for CDX-301 ADAs.  This blood will be collected in to a single red top 
tube, labeled with patient ID, date, and visit time point, and will be taken directly to the 
DeNardo lab for cryopreservation and batch shipping to Celldex. 
 
9.4 
Specimen Analysis 
 
First, we will assess the impact of CDX-1140 compared to CDX-301/CDX-1140 on 
multiple parameters of PDAC local and systemic tumor immunity. Second, we expect 
diverse objective responses to therapy; blood and PDAC tissues parameters can be 
correlated with patient outcomes to identify the biological parameters that indicate 
therapeutic benefit. 
 
Our tissue collections will include pre- treatment and time of surgery blood and sera, as 
well as tumor tissue collected at the time of surgery. Tissue collection will be mandatory 
for all patients. Tumor tissues will be divided into cryopreserved, formalin-fixed paraffin-
embedded (FFPE), and flow cytometry/CyTOF samples. We will directly assess how no-
treatment vs CDX-1140 vs CDX-301/CDX-1140 alters immune cell tumor infiltration 
using high-density flow cytometry and CyTOF. We optimized two 14-parameter flow 
cytometry protocols to assess T-cell infiltration, activation, and exhaustion, and myeloid 
cell and DC infiltration and two 35 parameter CyTOF panel (see Figure). This will be 
complemented by Single Cell RNA sequencing when tissue it sufficient.  Conventional 
dendritic cells are defined by the  lack of expression of CD3, CD19, CD20, CD16, CD56, 
and the expression of CD45, CD11c, MHCII high and either CD1c or CD141. 
 


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On archival FFPE tissues we will complement flow 
cytometry with multiplex IHC on FFPE tissue. We 
optimized several multiplex IHC panels using the 
PerkinElmer OPAL system. These panels can identify 
changes in T-cell infiltration and proliferation (e.g., 
CD3+/CD8+/Ki67+) and proximity to tumor cells 
(CK19). For imaging and deconvolution we will capture 
images and conduct quantitative analysis using HALO 
pattern recognition software. 
 
We will analyze blood leukocyte populations using two 
optimized 36-parameter CyTOF panels designed for 
adaptive and innate immune cells, respectively. We will 
focus on evidence of increased T-cell activation 
corresponding with tumor reactivity (similar to results 
from human checkpoint studies43, 44). This will include 
analyses of T-cell proliferation (Ki67), lineage 
transcription factors (e.g., GATA3, T-bet, Eomes), 
effector function (Granzyme B, perforin), memory 
status 
(e.g., 
KLRG1, 
CD28, 
CD127), 
and 
exhaustion/checkpoint marker expression (e.g., 41BB, 
LAG3, TCF1 and SLMF6). We will perform unguided 
analysis of this CyTOF data using PhenoGraph and X-
Shift to identify uniquely changing T-cell subsets, and 
Citirs to determine potential biomarkers of treatment 
response.  
 
 
10 
DATA SUBMISSION SCHEDULE 
 
Case report forms with appropriate source documentation will be completed according to the 
schedule listed in this section. 
 
 
Figure. (A) T-cell CyTOF panel. 
(B) CyTOF data from human PDAC 
tissues (n=6) analyzed for T-cell 
subsets by PhenoGraph. 


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Case Report Form 
Submission Schedule 
Original Consent Form 
Prior to registration 
On-Study Form 
Medical History Form 
Prior to starting treatment 
Toxicity Form 
Continuous 
Treatment Summary Form 
Completion of treatment 
Surgery Form 
Time of surgery 
Research Specimen Form 
Baseline, time of CDX-1140 treatment, time of surgery 
Follow Up Form 
Every 6 months for 2 years; 60 days after EOT if surgery 
is not performed  
Progression Form 
Time of disease progression 
Death Form 
Time of death 
MedWatch Form 
See Section 7.0 for reporting requirements 
 
10.1 
Adverse Event Collection in the Case Report Forms 
 
All adverse events that occur beginning with start of treatment (minus exceptions defined 
in Section 7.0) must be captured in the Toxicity Form.  Baseline AEs should be captured 
on the Medical History Form. 
 
Participant death due to disease progression should be reported on the Toxicity Form as 
grade 5 disease progression.  If death is due to an AE (e.g. cardiac disorders: cardiac arrest), 
report as a grade 5 event under that AE.  Participant death must also be recorded on the 
Death Form. 
 
 
11 
MEASUREMENT OF EFFECT 
 
Primary Endpoint: This study is powered to detect a two-fold change in intratumoral 
conventional dendritic cells between CDX-1140 vs. CDX-301 plus CDX-1140 treated patients. 
This is a critical endpoint to ensure CDX-301 plus CDX-1140 is having its intended biological 
effect and thus has a likelihood of impacting tumor immunity and patient outcomes.  
 
Correlative Secondary Endpoints: These will include global immune profiling by CyTOF, 
single cell RNASeq analysis, and histologic assessments. Critical to this assessment will be 
comparative analysis of the impact of CDX-1140 vs. CDX-301 plus CDX-1140 on T cell and cDC 
number and phenotype.  
 
 
Exploratory endpoints: These will include local control rate, distant metastasis-free survival 
(DMFS), overall survival (OS), and margin negative resection rate. Proportions of local control 
and margin negative resection for all treated patients.  
 
 
12 
DATA AND SAFETY MONITORING 


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In compliance with the Washington University Institutional Data and Safety Monitoring Plan, the 
Principal Investigator will provide a Data and Safety Monitoring (DSM) report to the Washington 
University Quality Assurance and Safety Monitoring Committee (QASMC) semi-annually 
beginning six months after accrual has opened (if at least one patient has been enrolled) or one 
year after accrual has opened (if no patients have been enrolled at the six-month mark). 
 
The Principal Investigator will review all patient data at least every six months, and provide a 
semi-annual report to the QASMC. This report will include: 
• HRPO protocol number, protocol title, Principal Investigator name, data coordinator 
name, regulatory coordinator name, and statistician 
• Date of initial HRPO approval, date of most recent consent HRPO approval/revision, 
date of HRPO expiration, date of most recent QA audit, study status, and phase of study 
• History of study including summary of substantive amendments; summary of accrual 
suspensions including start/stop dates and reason; and summary of protocol exceptions, 
error, or breach of confidentiality including start/stop dates and reason 
• Study-wide target accrual and study-wide actual accrual 
• Protocol activation date 
• Average rate of accrual observed in year 1, year 2, and subsequent years 
• Expected accrual end date and accrual by cohort 
• Objectives of protocol with supporting data and list the number of participants who 
have met each objective 
• Measures of efficacy 
• Early stopping rules with supporting data and list the number of participants who have 
met the early stopping rules 
• Summary of toxicities separated by cohorts  
• Abstract submissions/publications 
• Summary of any recent literature that may affect the safety or ethics of the study  
 
The study principal investigator and Research Patient Coordinator will monitor for serious 
toxicities on an ongoing basis. Once the principal investigator or Research Patient Coordinator 
becomes aware of an adverse event, the AE will be reported to the HRPO and QASMC according 
to institutional guidelines. 
 
 
13 
STATISTICAL CONSIDERATIONS 
 
13.1 
Study Design 
 
This is a two-arm randomized Phase II trial. All the enrolled patients with resectable 
pancreatic cancer will undergo surgery. Patients will be 1:1 randomized to one of two 
treatments: neoadjuvant CDX-1140 vs. CDX-301 plus CDX-1140.  
 


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13.2 
Sample Size Calculation 
 
The primary endpoint is intratumoral conventional dendritic cells (cDCs) at surgery. The 
sample size calculation is based on the primary endpoint only. Our pilot data in animal 
models showed that the mean and standard deviation of the number of intratumoral cDCs 
per gram of tissue in CD40 agonist IgGs was 44726 with a standard deviation of 37895, 
and for mice treated with CDX-301 plus CD40 agonist, the mean cDCs per gram of tissue 
was 2716742 with a standard deviation of 1322448. Assuming a similar therapeutic effect 
on cDCs and similar distribution among samples, 12 patients per arm will have at least 
99.9% power to detect the intratumoral cDCs difference as measured by CyTOF between 
two arms using a two-sided two-group T-test at the type I error of 5%. We plan to enroll 
12 patients evaluable for the primary objective per arm for a total of 24 evaluable patients. 
An interim analysis can be performed at 5 patients per arm or greater; 5 patients per arm 
will have >80% power to detect changes in cDCs. 
 
13.3 
Accrual 
 
We perform surgery in 80-110 patients per year at Washington University with similar 
characteristics and estimate approximately 30-40 patients/year may be eligible for and will 
participate in this trial. We anticipate enrollment of approximately 1-3 patients per month.  
 
13.4 
Statistical Analyses 
 
 Patient Disposition 
 
The number of patients discontinued, the reasons for discontinuation, and the 
amount of therapy administered will be summarized by patient and by reason for 
discontinuation by arm. 
 
 Protocol Deviations 
 
All significant deviations will be summarized by patient and by type of deviation. 
 
 Demographics and Baseline Characteristics 
 
Subject demographic and clinical characteristics will be summarized to 
characterize the population. Descriptive summaries will include means, standard 
deviations, medians, ranges for continuous variables and frequency and percentage 
for categorical variables. They are presented by total and each arm, respectively. 
 
 Endpoint Analysis 
 
The primary endpoint is intratumoral cDCs in surgical tissues. Conventional 
dendritic cells are defined by the lack of expression of CD3, CD19, CD20, CD16, 
CD56, and the expression of CD45, CD11c, MHCII high and either CD1c or 
CD141.  Kruskal-Wallis test will be used to compare the difference between two 


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arms.  
 
Exploratory endpoints include global immune profiling by CyTOF, single cell 
RNASeq analysis, and histologic assessments. Kruskal-Wallis test will be used to 
compare the difference on T cell and cDC number and phenotype between two 
arms.  
 
Additional exploratory endpoints include local control rate, distant metastasis-free 
survival (DMFS), overall survival (OS), and margin negative resection rate. 
Proportions of local control and  margin negative resection for all treated patients 
and their associated 95% confidence intervals will be calculated assuming a 
binomial distribution. Chi-square or Fisher’s exact test will be used to compare the 
difference between two arms.  
 
OS is defined as the time from the date of treatment to the date of death, censored 
at the last follow-up otherwise. DMFS is defined as the time from treatment to the 
date of distant metastasis or death, whichever occurs first. The alive patients 
without distant metastasis is censored at the last follow-up. The Kaplan-Meier 
method will be used to calculate the probability of OS and DMFS. The log-rank 
test will be considered to compare the difference of OS and DMFS between two 
arms. 
 
Data on the toxicity in each arm will be collected for each subject, including 
frequency, type, and severity of adverse events. All analyses will be conducted 
using SAS (SAS Institute, Cary, NC) at the two-sided 5% significance level.  
 
 
 


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14 
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Patient Survival in Pancreatic Cancer: a Role for Targeting the CCL2/CCR2 Axis. Clin Cancer 
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8. Zhu Y, Knolhoff BL, Meyer MA, et al. CSF1/CSF1R Blockade Reprograms Tumor-
Infiltrating Macrophages and Improves Response to T Cell Checkpoint Immunotherapy in 
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Immunity. Trends Cancer. 2018;4: 784-792. 
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12. Hegde S, Krisnawan VE, Herzog BH, et al. Dendritic Cell Paucity Leads to Dysfunctional 
Immune Surveillance in Pancreatic Cancer. Cancer Cell. 2020;37: 289-307 e289. 
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14. Bray F, Ferlay J, Soerjomataram I, Siegel RL, Torre LA, Jemal A. Global cancer statistics 
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19. Pang Y, Holmes MV, Chen Z, Kartsonaki C. A review of lifestyle, metabolic risk factors, 
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pancreatic cancer to prolong survival and reduce treatmentassociated toxicities. Mol Med Rep. 
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31. Teleshova N, Jones J, Kenney J, et al. Short-term Flt3L treatment effectively mobilizes 
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32. Ding Y, Wilkinson A, Idris A, et al. FLT3-ligand treatment of humanized mice results in the 
generation of large numbers of CD141+ and CD1c+ dendritic cells in vivo. J Immunol. 
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33. Pulendran B, Smith JL, Jenkins M, Schoenborn M, Maraskovsky E, Maliszewski CR. 
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34. Baca-Estrada ME, Ewen C, Mahony D, Babiuk LA, Wilkie D, Foldvari M. The haemopoietic 
growth factor, Flt3L, alters the immune response induced by transcutaneous immunization. 
Immunology. 2002;107: 69-76. 
35. Hammerich L, Marron TU, Upadhyay R, et al. Systemic clinical tumor regressions and 
potentiation of PD1 blockade with in situ vaccination. Nature Medicine. 2019. 
36. Meyer MA, Baer JM, Knolhoff BL, et al. Breast and pancreatic cancer interrupt IRF8-
dependent dendritic cell development to overcome immune surveillance. Nature 
Communications. 2018;9: 1250. 
37. Salmon H, Idoyaga J, Rahman A, et al. Expansion and Activation of CD103+ Dendritic Cell 
Progenitors at the Tumor Site Enhances Tumor Responses to Therapeutic PD-L1 and BRAF 
Inhibition. Immunity. 2016;44: 924-938. 
38. Byrne KT, Vonderheide RH. CD40 Stimulation Obviates Innate Sensors and Drives T Cell 
Immunity in Cancer. Cell Reports. 2016;15: 2719-2732. 
39. Beatty GL, Chiorean EG, Fishman MP, et al. CD40 agonists alter tumor stroma and show 
efficacy against pancreatic carcinoma in mice and humans. Science (New York, N.Y.), 
2011:1612-1616. 
40. Hammerich L, Marron TU, Upadhyay R, et al. Systemic clinical tumor regressions and 
potentiation of PD1 blockade with in situ vaccination. Nat Med. 2019;25: 814-824. 
41. Anandasabapathy N, Breton G, Hurley A, et al. Efficacy and safety of CDX-301, 
recombinant human Flt3L, at expanding dendritic cells and hematopoietic stem cells in healthy 
human volunteers. Bone Marrow Transplant. 2015;50: 924-930. 
42. Vitale LA, Thomas LJ, He LZ, et al. Development of CDX-1140, an agonist CD40 antibody 
for cancer immunotherapy. Cancer Immunol Immunother. 2019;68: 233-245. 
43. Takeuchi Y, Tanemura A, Tada Y, Katayama I, Kumanogoh A, Nishikawa H. Clinical 
response to PD-1 blockade correlates with a sub-fraction of peripheral central memory CD4+ T 
cells in patients with malignant melanoma. Int Immunol. 2018;30: 13-22. 
44. Manjarrez-Orduno N, Menard LC, Kansal S, et al. Circulating T Cell Subpopulations 
Correlate With Immune Responses at the Tumor Site and Clinical Response to PD1 Inhibition in 
Non-Small Cell Lung Cancer. Front Immunol. 2018;9: 1613. 
 
 
We would like to thank the Alvin J. Siteman Cancer Center at Washington University School of 
Medicine and Barnes-Jewish Hospital in St. Louis, Missouri, for the use of the Clinical Trials Core 
which provided protocol development services. The Siteman Cancer Center is supported in part 
by an NCI Cancer Center Support Grant #P30 CA91842. 
 
 


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APPENDIX A: ECOG Performance Status Scale 
 
 
Grade 
 
 
Description 
0 
Normal activity.  Fully active, able to carry on all pre-disease 
performance without restriction. 
1 
Symptoms, but ambulatory.  Restricted in physically strenuous 
activity, but ambulatory and able to carry out work of a light or 
sedentary nature (e.g., light housework, office work). 
2 
In bed <50% of the time.  Ambulatory and capable of all self-care, but 
unable to carry out any work activities.  Up and about more than 50% 
of waking hours. 
3 
 
In bed >50% of the time.  Capable of only limited self-care, confined 
to bed or chair more than 50% of waking hours. 
 
4 
100% bedridden.  Completely disabled.  Cannot carry on any self-care.  
Totally confined to bed or chair. 
5 
 
Dead. 
 
 
 
 


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APPENDIX B: Definitions for Adverse Event Reporting 
 
A. Adverse Events (AEs) 
 
As defined in 21 CFR 312.32: 
 
Definition: any untoward medical occurrence associated with the use of a drug in humans, 
whether or not considered drug-related. 
 
Grading: the descriptions and grading scales found in the revised NCI Common Terminology 
Criteria for Adverse Events (CTCAE) version 5.0 will be utilized for all toxicity reporting.  A 
copy of the CTCAE version 5.0 can be downloaded from the CTEP website. 
 
Attribution (relatedness), Expectedness, and Seriousness: the definitions for the terms 
listed that should be used are those provided by the Department of Health and Human Services’ 
Office for Human Research Protections (OHRP).  A copy of this guidance can be found on 
OHRP’s website: 
http://www.hhs.gov/ohrp/policy/advevntguid.html 
 
B. Suspected Adverse Reaction (SAR) 
 
As defined in 21 CFR 312.32: 
 
Definition: any adverse event for which there is a reasonable possibility that the drug caused 
the adverse event.  “Reasonable possibility” means there is evidence to suggest a causal 
relationship between the drug and the adverse event.  “Suspected adverse reaction” implies a 
lesser degree of certainty about causality than adverse reaction, which means any adverse event 
caused by a drug. 
 
C. Life-Threatening Adverse Event / Life Threatening Suspected Adverse Reaction  
 
As defined in 21 CFR 312.32: 
 
Definition: any adverse drug event or suspected adverse reaction is considered “life-
threatening” if, in the view of the investigator, its occurrence places the patient at immediate 
risk of death. It does not include an adverse event or suspected adverse reaction that, had it 
occurred in a more severe form, might have caused death. 
 
D.  Serious Adverse Event (SAE) or Serious Suspected Adverse Reaction 
 
As defined in 21 CFR 312.32: 
 
Definition:  an adverse event or suspected adverse reaction is considered “serious” if, in the 
view of the investigator, it results in any of the following outcomes: 
o Death 
o A life-threatening adverse event 


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o Inpatient hospitalization or prolongation of existing hospitalization 
o A persistent or significant incapacity or substantial disruption of the ability to conduct 
normal life functions 
o A congenital anomaly/birth defect 
o Any other important medical event that does not fit the criteria above but, based upon 
appropriate medical judgment, may jeopardize the subject and may require medical or 
surgical intervention to prevent one of the outcomes listed above 
 
E. Protocol Exceptions 
 
Definition: A planned change in the conduct of the research for one participant. 
 
F. Deviation 
 
Definition: Any alteration or modification to the IRB-approved research without prospective 
IRB approval.  The term “research” encompasses all IRB-approved materials and documents 
including the detailed protocol, IRB application, consent form, recruitment materials, 
questionnaires/data collection forms, and any other information relating to the research study. 
 
A minor or administrative deviation is one that does not have the potential to negatively impact 
the rights, safety, or welfare of participants or others or the scientific validity of the study. 
 
A major deviation is one that does have the potential to negatively impact the rights, safety, or 
welfare of participants or others or the scientific validity of the study. 
 


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APPENDIX C: Reporting Timelines 
 
Expedited Reporting Timelines 
Event 
HRPO 
QASMC 
FDA 
Celldex 
Serious AND 
unexpected suspected 
adverse reaction 
 
 
Report no later than 15 
calendar days after it is 
determined that the 
information qualifies for 
reporting 
 
Serious adverse events 
regardless of 
relatedness 
 
 
 
Report to Celldex within 24 
hours of the investigator 
becoming aware of the event.   
Unexpected fatal or 
life-threatening 
suspected adverse 
reaction 
 
 
Report no later than 7 
calendar days after initial 
receipt of the information 
 
Unanticipated 
problem involving risk 
to participants or 
others 
Report within 10 working days.  If the 
event results in the death of a participant 
enrolled at WU/BJH/SLCH, report within 
1 working day. 
Report via email after IRB 
acknowledgment 
 
 
Pregnancy 
 
 
 
Each pregnancy that occurs in 
female subjects or female 
partners of male subjects while 
on the study drug or within 3 
months following completion 
of the study drug must be 
reported to Celldex within 24 
hours of the investigator 
becoming aware of its 
occurrence. 
Major deviation 
Report within 10 working days.  If the 
event results in the death of a participant 
enrolled at WU/BJH/SLCH, report within 
1 working day. 
 
 
 
A series of minor 
deviations that are 
Report within 10 working days.   
 
 
 


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Expedited Reporting Timelines 
Event 
HRPO 
QASMC 
FDA 
Celldex 
being reported as a 
continuing 
noncompliance 
Protocol exception 
Approval must be obtained prior to 
implementing the change 
 
 
 
Clinically important 
increase in the rate of 
a serious suspected 
adverse reaction of 
that list in the protocol 
or IB 
 
 
Report no later than 15 
calendar days after it is 
determined that the 
information qualifies for 
reporting 
 
Complaints 
If the complaint reveals an unanticipated 
problem involving risks to participants or 
others OR noncompliance, report within 
10 working days.  If the event results in 
the death of a participant enrolled at 
WU/BJH/SLCH, report within 1 working 
day.  Otherwise, report at the time of 
continuing review. 
 
 
 
Breach of 
confidentiality 
Within 10 working days. 
 
 
 
Incarceration 
If withdrawing the participant poses a 
safety issue, report within 10 working 
days.   
 
If withdrawing the participant does not 
represent a safety issue and the patient 
will be withdrawn, report at continuing 
review. 
 
 
 
 


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Routine Reporting Timelines 
Event 
HRPO 
QASMC 
FDA 
Celldex 
Adverse event or SAE 
that does not require 
expedited reporting 
If they do not meet the definition of an 
unanticipated problem involving risks to 
participants or others, report summary 
information at the time of continuing review 
Adverse events will be 
reported in the toxicity 
table in the DSM report 
which is typically due 
every 6 months. 
The most current 
toxicity table from the 
DSM report is provided 
to the FDA with the 
IND’s annual report. 
 
Minor deviation 
Report summary information at the time of 
continuing review. 
 
 
 
Complaints 
If the complaint reveals an unanticipated problem 
involving risks to participants or others OR 
noncompliance, report within 10 working days.  If 
the event results in the death of a participant 
enrolled at WU/BJH/SLCH, report within 1 
working day.  Otherwise, report at the time of 
continuing review. 
 
 
 
Incarceration 
If withdrawing the participant poses a safety 
issue, report within 10 working days.   
 
If withdrawing the participant does not represent a 
safety issue and the patient will be withdrawn, 
report at continuing review. 
 
 
 
 

ICF_001.pdf: 
 
FOR IRB USE ONLY 
IRB ID #: 202011125 
APPROVAL DATE: 12/01/23 
RELEASED DATE: 12/01/23 
EXPIRATION DATE: 10/08/24 
 
INFORMED CONSENT DOCUMENT 
 
Project Title: 
Testing the immunologic effects of CDX-301 and CDX-1140 in resectable 
pancreatic cancer patients 
 
Principal Investigator: 
Roheena Panni, M.D. 
 
Research Team Contact: 
Roheena Panni, M.D. – (314) 362-7046 
 
 
This consent form describes the research study and helps you decide if you want to participate.  It 
provides important information about what you will be asked to do during the study, about the risks and 
benefits of the study, and about your rights and responsibilities as a research participant. By signing this 
form you are agreeing to participate in this study. 
o You should read and understand the information in this document including the procedures, 
risks and potential benefits.  
o If you have questions about anything in this form, you should ask the research team for more 
information before you agree to participate.   
o You may also wish to talk to your family or friends about your participation in this study. 
o Do not agree to participate in this study unless the research team has answered your 
questions and you decide that you want to be part of this study.  
 
KEY INFORMATION    
The first section of this document contains some key points that the research team thought you would 
find important. The research study is described in more detail after this section. 
 
This is a research study conducted by Dr. Roheena Panni having to do with the investigational treatment 
of pancreatic cancer. You should carefully consider the information in this consent document and 
discuss it with the research team. Be sure you understand why you might want to participate, or why you 
might not want to participate. You may choose to participate or not. 
 
If you agree and sign this consent, you will be volunteering to participate in the research study. All of 
the information below will be explained and is listed in more detail in the consent document below. The 
research team must give you a copy of this signed consent document. 
 
How will this study affect me? 
• 
The purpose of this study is to look at the effects of treating pancreatic cancer with either a drug 
called CDX-1140 or with CDX-1140 in combination with CDX-301. 
• 
As a voluntary participant, your treatment will last for 2 to 3 weeks and will also include 2 years 
of follow-up afterwards. 
• 
You were selected because you have pancreatic cancer that can be surgically removed. 
• 
You will be in this study for approximately 2 years and will have the following tests and 
procedures at various time points throughout the study:  
o Physical exam 
o Safety blood tests 
o Research blood tests 


 
FOR IRB USE ONLY 
IRB ID #: 202011125 
APPROVAL DATE: 12/01/23 
RELEASED DATE: 12/01/23 
EXPIRATION DATE: 10/08/24 
 
Version 11/30/23 
Page 2 of 15 
• 
You will need to come to the Siteman Cancer Center for your treatment. 
• 
The main risks to you are muscle pain, joint pain, chills, nausea, fever, fatigue.  More detail 
about risks is provided below. 
• 
You will not be paid for participating in this study. As part of this study you will receive tests 
and procedures that are similar to what you would receive during routine clinical care of your 
condition.  Your health plan/insurance company will be billed for some or all of these costs, and 
you will be responsible for any co-pays and deductibles that are normally required by your health 
plan/insurance.   
• 
If you withdraw from the study, the research team may continue to use information already 
collected about you in this study. 
 
The rest of this document provides more details about the study.  
 
WHAT IS THE PURPOSE OF THIS STUDY? 
This is a research study.  We invite you to participate in this research study because you have been 
diagnosed with pancreatic cancer that can be surgically removed. 
 
The purpose of this research study is to look at the effects, good and bad, of treating pancreatic cancer 
with either a drug called CDX-1140 or with CDX-1140 in combination with CDX-301.  People 
enrolling to this study will be randomly assigned (like the flip of a coin) to receive either a single dose of 
CDX-1140 before surgery to remove their cancer OR five doses of CDX-301 AND a single dose of 
CDX-1140 before surgery. 
 
Both CDX-1140 and CDX-301 are considered investigational, which means that they have not been 
approved by the U.S. Food and Drug Administration.   
 
WHAT WILL HAPPEN DURING THIS STUDY? 
All treatment will be given in either the outpatient or inpatient setting at Siteman Cancer Center. We feel 
it is important to remind you that any procedures, regardless of whether they are tests you would have if 
you did not take part in the research or are research-related, will require you to remain at the Siteman 
Cancer Center up to several hours. There may also be a wide variability in the length of clinic visits. It is 
important that you are able to be available to complete the procedures at each visit to ensure that your 
safety and treatment needs are met. 
 
If you decide to join the study, you may experience side effects that could delay or prevent surgery. 
 
Before you begin study treatment: 
You will need to have the following screening exams, tests, or procedures to find out if you can continue 
to be in the study. Most of these procedures are part of regular cancer care and may be done even if you 
do not join the study. If you have had some of them recently, they may not need to be repeated. This will 
be up to your study doctor. 
• Physical exam, including taking of vital signs, measuring your height and weight, reviewing your 
medical history, and talking about any symptoms or health problems you’re having 
• Blood tests to check your blood counts, organ function, and how your blood is clotting 
(approximately 1 tablespoon blood will be drawn from a vein in your arm) 
• Pregnancy test if you are a person who can get pregnant (approximately ½ teaspoon blood will 


 
FOR IRB USE ONLY 
IRB ID #: 202011125 
APPROVAL DATE: 12/01/23 
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be drawn from a vein in your arm) 
• Blood draw for research purposes (approximately 2 tablespoons blood will be drawn from a vein 
in your arm) 
 
It is possible that after your medical history, tests, and procedures are reviewed, you will not be able to 
continue in this study. Your study doctor will go over any reasons why you might not be able to 
continue in the study with you. 
 
Procedures throughout the study: 
If you are able to continue in the study and you choose to do so, you will be randomly assigned (like the 
flip of a coin) to Arm 1 or Arm 2 of the study.  People assigned to Arm 1 will receive a single dose of 
CDX-1140 as an IV infusion 7 to 12 days prior to standard surgery to remove the pancreas tumor.  
People assigned to Arm 2 will also receive a single dose of CDX-1140 as described above, but they will 
also receive 5 subcutaneous injections of CDX-301 3, 4, 5, 6, and 7 days before the CDX-1140 infusion. 
 
Regardless of whether you are assigned to Arm 1 or Arm 2, you will have another 2 tablespoons of 
blood drawn for research purposes immediately before the infusion of CDX-1140, and again at the time 
of surgery.  You will also have a piece of the tumor tissue that is removed from your pancreas collected 
for research purposes for this study. 
 
Follow-up procedures: 
After surgery, you will have routine follow-up with your doctor.  For this study, we will continue to 
collect information about your health and wellbeing for up to 2 years after surgery.  That could be done 
at the time of an in-person doctor’s visit or by phone call from a nurse or research coordinator. 
 
Will you save my research information and/or biospecimens to use in future research studies? 
We would like to use the blood, tissue, and data we are obtaining in this study for studies going on right 
now as well as studies that are conducted in the future, including future genetic research.  These studies 
may provide additional information that will be helpful in understanding pancreatic cancer, or other 
diseases or conditions, including research to develop investigational tests, treatments, drugs or devices 
that are not yet approved by the U.S. Food and Drug Administration.  It is unlikely that what we learn 
from these studies will have a direct benefit to you.  There are no plans to provide financial 
compensation to you should this occur.  By allowing us to use your blood, tissue, and data you give up 
any property rights you may have in the blood, tissue, and data. 
 
Future research may include genetic research. Genes are a unique combination of molecules (called 
DNA) that we inherit from our parents.  There are millions of tiny differences in our genes.  These 
differences may make us more or less likely to develop certain diseases or conditions or to have certain 
characteristics.  Genetic research involves studying the differences in genes and DNA between 
individuals. This type of testing creates information that is as unique to you as your fingerprint. 
 
We will share your blood, tissue, and data with other researchers. They may be doing research in areas 
similar to this research or in other unrelated areas.  These researchers may be at Washington University, 
at other research centers and institutions, or industry sponsors of research.  We may also share your 
research data with large data repositories (a repository is a database of information) for broad sharing 
with the research community.  If your individual research data is placed in one of these repositories only 


 
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qualified researchers, who have received prior approval from individuals that monitor the use of the 
data, will be able to look at your information.   
 
If you change your mind and do not want us to store and use your blood, tissue, and data for future 
research you should contact the research team member identified at the top of this document.  The 
blood, tissue, and data will no longer be used for research purposes. However, if some research with 
your blood, tissue, and data has already been completed, the information from that research may still be 
used. Also, if the blood, tissue, and data has been shared with other researchers it might not be possible 
to withdraw the blood, tissue, and data to the extent it has been shared. 
 
Please place your initials in the blank next to Yes or No for the question below: 
 
My blood, tissue, and data may be stored and used for future research as described above. 
 
_____ Yes 
_____ No 
Initials  
Initials 
 
Unless you agree to future use as described above, your private information including blood, tissue, and 
data collected as part of this study will not be used or distributed for future research studies, even if 
identifiers are removed. 
 
HOW MANY PEOPLE WILL PARTICIPATE? 
Approximately 24 people will take part in this study conducted by investigators at Washington 
University. 
 
HOW LONG WILL I BE IN THIS STUDY? 
If you agree to take part in this study, your involvement will last for 2 to 3 weeks, with up to 2 years of 
follow-up afterwards. 
 
WHAT ARE THE RISKS OF THIS STUDY? 
You may experience one or more of the risks indicated below from being in this study. In addition to 
these, there may be other unknown risks, or risks that we did not anticipate, associated with being in this 
study.  
 
Some risks described in this consent document, if severe, may cause death.  
 
As of September 5, 2022, CDX-1140 has been administered to 129 patients in a Celldex sponsored study 
and the information below reflects data from that study.  In the Celldex sponsored study, 58 patients 
received CDX-1140 as monotherapy, and 37 patients received CDX-1140 in combination with CDX-
301.   Side effects thought to be related to CDX-1140 monotherapy and in combination with CDX-301 
are further detailed below. 
 
Risks of CDX-1140 Monotherapy: 
There have been 58 patients who have received CDX-1140 monotherapy in a Celldex sponsored study.   
 
 


 
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Side effects thought to be related to CDX-1140 monotherapy have included the following: 
 
Very common  
(Out of 100 people who receive CDX-1140, more than 20 people may have the following): 
• Joint Pain 
• Chills 
• Nausea 
• Fever 
• Fatigue 
 
Common  
(Out of 100 people who receive CDX-1140, 11-20 people may have the following): 
• Diarrhea 
• Muscle pain 
• Vomiting 
• Digestive enzyme increase 
• Liver enzyme increase 
 
Less common  
(Out of 100 people who receive CDX-1140, 6-10 people may have the following): 
• Joint inflammation 
• Swelling in arms and/or legs 
• Anemia (low red blood cells) 
• Influenza like illness 
• Decreased appetite 
• Pneumonitis (inflammation of the lungs) 
• Rash 
 
It is anticipated that most patients may experience at least some side effects. Most adverse events 
associated with CDX-1140 to date have started in the 24-48 hours following the CDX-1140 infusion, 
been mild to moderate, and have resolved with or without medications such as acetaminophen (Tylenol 
®), anti-inflammatory medications such as naproxen sodium (Aleve ®), and/or anti-nausea medication 
such as ondansetron (Zofran ®). In a few cases, the side effects have been severe and have required 
hospitalization and treatment with corticosteroids or other immunosuppressive medications. You will be 
given medications to prevent or lessen the severity of side effects.  You will take these medications prior 
to each CDX-1140 infusion and for at least 24-48 hours after each CDX-1140 infusion.  It is important 
that you take the medications even if you do not have any symptoms.  
 
It is expected that CDX-1140 will cause a decrease in certain white blood cells and platelets and an 
increase in liver enzymes (as noted above) as determined by blood tests in the first few days after the 
infusion. These effects have not generally been associated with any symptoms, have not required 
treatment, and the laboratory values usually resolved within approximately 1-2 weeks after the CDX-
1140 infusion. The study requires that your doctor closely monitor these tests.  If the effects of CDX-
1140 on white blood cells and platelets are severe or prolonged, then you might be at increased risk of 
infection and bleeding and your doctor might need to treat you with other medications, for example, 


 
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with steroids. If your liver enzymes increase too much your doctor will follow you closely and will want 
to continue testing until the levels return to normal. 
 
Significant and Common Side Effects Associated with CDX-1140 in a Celldex Sponsored Study 
 
Cytokine Release Syndrome: Infrequently, patients who received CDX-1140 experienced more severe 
infusion reactions called cytokine release syndrome. Cytokine release syndrome has been reported in 
12/129 (9%) patients in a Celldex sponsored study, with 3 occurring in patients who received CDX-1140 
monotherapy, 5 occurring in patients receiving CDX-1140 in combination with CDX-301, and 4 
occurring in patients receiving CDX-1140 in combination with another agent.  Four patients 
discontinued study treatment due to cytokine release syndrome and no patients have died due to 
cytokine release syndrome.  Symptoms included fever, weakness, low blood pressure, low blood 
oxygen, elevated liver enzymes, nausea, diarrhea, vomiting and poor functioning of the kidneys.  
Treatment for cytokine release syndrome may include strong medications like corticosteroids and other 
medications to reduce inflammation. These treatments can have serious side effects that can be outlined 
by your doctor. 
 
Lung inflammation (pneumonitis): 7/129 (5%) patients who received CDX-1140 monotherapy 
experienced severe treatment related inflammation of the lungs called pneumonitis, 4 occurring in 
patients who received CDX-1140 monotherapy, 2 occurring in patients who received CDX-1140 in 
combination with CDX-301, and 1 occurring in patients who received CDX-1140 in combination with 
other agents. Patients developed shortness of breath and imaging of the lungs demonstrated new 
inflammatory changes. These patients required hospitalization and treatment with stronger medications, 
such as corticosteroids and other medications to reduce inflammation. Pneumonitis can be life-
threatening, and one patient died in the CDX1140-01 study where the cause of death was partially 
attributed to pneumonitis.  Please immediately inform your physician and study team if you develop any 
new or worsening shortness of breath, pain or discomfort while breathing, cough, chest pain or other 
respiratory symptoms. 
 
Fever: Fever is common following the CDX-1140 infusion, occurring in approximately 41% of patients. 
Onset is typically within 48 hours of the CDX-1140 infusion. Some patients may have accompanying 
dehydration along with the fever.  Therefore, if you do develop a fever, you should try to stay well 
hydrated as instructed by your doctor. Pre- and post-infusion acetaminophen and a non-steroidal anti-
inflammatory drug (NSAID) should be taken as described above. 
 
Joint pain and muscle pain: Joint pain and muscle pain are common treatment side effects following 
CDX-1140 administration, occurring in 53% and 24% of patients, respectively. Please inform your 
physician and study team if you are having joint pain and/or muscle pain and you may be told to take 
acetaminophen or NSAID medications or prescribed a short course of corticosteroids if the symptoms 
are not relieved with over-the-counter medicine. 
 
Immune-related inflammatory reactions: Drugs that increase anticancer immune responses can 
sometimes cause swelling (or inflammation) in normal (non-diseased) organs. These reactions may 
cause a range of symptoms and involve any organ. Side effects that have been reported with other types 
of immune activating agents include: 
• Ocular: Eye inflammation 


 
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• Digestive: Inflammation of the gut lining that could be associated with diarrhea, constipation, 
bleeding, abdominal pain; inflammation of the pancreas (pancreatitis) 
• Skin: Rash, itching, loss of skin pigmentation (color) 
• Liver: Inflammation in the liver (hepatitis) 
• Endocrine: Overactive or underactive glands that produce hormones. These hormones regulate a 
number of body processes; Diabetes (increase in blood glucose levels) 
Other: weakness, numbness, and pain usually in hand or feet, disorder in which your body’s 
immune system attacks your nerves (Guillain-Barre syndrome)  
 
These kinds of side effects can occasionally be severe or even life-threatening. Sometimes, treatment 
with medications that suppress the immune system, such as corticosteroids, is required. These types of 
medications can also be associated with serious side effects, such as the development of infections. You 
should ask your doctor if you have questions about the side effects of any medications used to manage 
side effects of CDX-1140. Based on experience with other drugs that activate the immune system, it is 
expected that if events listed above were to occur, they would likely be quickly controlled with 
appropriate therapy. However, it is possible that side effects could potentially rapidly worsen and 
become life-threatening and even cause death. Any delay in treating these side effects may prolong their 
duration and make them more difficult to treat. You should always immediately contact the study 
doctor if you develop any worrisome symptoms and report any new side effects during your 
regular study visit. 
 
Risks of CDX-301 
Approximately 155 individuals (including 34 healthy volunteers or healthy stem cell donors) have been 
treated with CDX-301.  Thirty-seven patients have been treated with the combination of CDX-1140 and 
CDX-301.  There have been no side-effects that have reached the level of 6 or more people out of 100 
people for the approximately 155 individuals who have received CDX-301.   
 
Side effects thought to be related to CDX-301 have included the following:   
 
CDX-301 is a fully human protein and it is unlikely, but possible, that it will induce an allergic reaction. 
No such reactions have been observed in the CDX-301 program. However, if such reactions were to be 
observed, possible symptoms could include fever, chills, rash, sudden feeling of cold with shivering 
accompanied by a rise in temperature (rigors), itching, or other symptoms. If not treated immediately, an 
allergic reaction could become life-threatening. If you think you might be having a reaction after being 
treated with CDX-301, or your symptoms are not going away, you must seek immediate medical 
attention. 
 
In theory, CDX-301 could cause your body to have an immune response against the FLT3 your body 
normally makes. If that were to happen, you might be at increased risk for infections.  Another 
theoretical risk of an anti-CDX-301 immune response is that your immune system might attack your 
body, resulting in a disease such as arthritis or kidney damage. However, none of these types of 
problems have been seen with CDX 301.   
 
Certain blood cancers have a mutation in the receptor for FLT3L, called FLT3, and it is possible that 
CDX-301 could enhance the growth of such tumor cells.  You should not receive CDX-301 if you have 
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An increase in certain white blood cells may be observed on routine blood testing after treatment with 
CDX-301 and is expected to return to normal within 2-3 weeks after the last dose of CDX-301.  You 
should tell your doctor if you are receiving any other drugs that can increase white blood cells, such as 
Neupogen (filgrastim) or Leukine (sargramostim), as the combination with CDX-301 could cause an 
unsafe increase in certain white blood cells. 
 
CDX-1140 in Combination with CDX-301 
There have been 37 patients who have received CDX-1140 in combination with CDX-301 (a growth 
factor for certain immune cells) in a Celldex sponsored study. 
 
Side effects thought to be related to CDX-1140 in combination with CDX-301 have included the 
following: 
 
Very common 
(Out of 100 people who receive CDX-1140 and CDX-301, more than 20 people may have the 
following): 
• Fatigue (tiredness) 
• Fever 
• Joint pain 
• Muscle pain 
 
Common  
(Out of 100 people who receive CDX-1140 and CDX-301, 11-20 people may have the following): 
• Chills 
• Cytokine release syndrome, which may include symptoms such as fever, low blood pressure, and 
low blood oxygen levels 
• Liver enzyme increase 
• Hot flash 
• Diarrhea 
• Nausea 
• Vomiting 
• Headache 
• Low blood pressure 
• Decreased platelet count 
• Low levels of salt in the blood 
 
Less Common 
(Out of 100 people who receive CDX-1140 and CDX-301, 6-10 people may have the following): 
• Influenza like illness 
• Dehydration (low fluids in body) 
• Night sweats 
• Increased blood creatinine 
• Low levels of oxygen in the blood 
 


 
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Risks of Blood Draw 
Possible side effects from a blood draw include fainting, dizziness, pain, swelling, bruising, or bleeding 
where the needle is inserted. There is also a slight possibility of infection where the needle is inserted. 
 
Risks of Randomization 
There is a risk that you may be assigned to a treatment group that is not the one your physician would 
choose for you. 
 
Risks for Women Capable of Becoming Pregnant 
If you are a woman capable of becoming pregnant, we will ask you to have a pregnancy test before 
beginning this study.  You must use effective birth control methods and try not to become pregnant 
while participating in this study or within 6 months after your last dose of study treatment.  If you 
become pregnant, there may be unknown risks to your unborn child, or risks to your unborn child that 
we did not anticipate.  There may be long-term effects of the treatment being studied that could increase 
the risk of harm to an unborn child.  You must tell the doctor if your birth control method fails while you 
are on the study. If you believe or know you have become pregnant while participating in this research 
study, please contact the research team member identified at the top of this document as soon as 
possible.  Please discuss with the research team how long you need to wait before becoming pregnant 
after completing the treatment or procedures on this study. 
 
Risks for Sexually Active Males 
If you are a sexually active male it is important that you not impregnate anyone or donate sperm during 
your participation in this study or within 3 months after your last dose of study treatment. There may be 
unknown risks to the unborn child or risks we did not anticipate. If pregnancy is a possibility, you must 
agree to use birth control if you want to take part in this study. If you believe or know that you have 
impregnated anyone, donated sperm or otherwise fathered a child during your participation in this study, 
please contact the research team member identified at the top of the document as soon as possible. 
 
Risk of Breach of Confidentiality 
One risk of participating in this study is that confidential information about you may be accidentally 
disclosed.  We will use our best efforts to keep the information about you secure.  Please see the section 
in this consent form titled “How will you keep my information confidential?” for more information. 
 
WHAT ARE THE BENEFITS OF THIS STUDY? 
You may or may not benefit from being in this study.   
 
However, we hope that, in the future, other people might benefit from this study because it will help 
researchers learn more about treatments for pancreatic cancer. 
 
WHAT OTHER TREATMENT OPTIONS ARE THERE? 
Before you decide whether or not to be in this study, your doctor will discuss the other options that are 
available to you.  Instead of being in this study, you could: 
• Get treatment or care for your cancer without being in a study; 
• Take part in another research study; 
• Get no treatment. 


 
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WILL IT COST ME ANYTHING TO BE IN THIS STUDY? 
As part of this study you will receive tests and procedures that are similar to what you would receive 
during routine clinical care of your condition.  Your health plan/insurance company will be billed for 
some or all of these costs, and you will be responsible for any co-pays and deductibles that are normally 
required by your health plan/insurance.  Not all insurance plans cover the costs associated with being in 
a study. Even if they do, you may be responsible for more out-of-pocket expenses, such as co-pays and 
deductibles, when there are more tests and procedures or more expensive tests and procedures involved 
in the study than if you were to receive routine clinical care outside the study.   
 
If you wish to know whether there are more tests and procedures or more expensive tests and procedures 
in the study, you should ask your study doctor.   
 
If you wish to know whether your insurance will pay, you should contact them directly, or speak with 
the study team about obtaining a financial pre-certification prior to enrolling in the study. 
 
Celldex Therapeutics is providing the CDX-1140 and CDX-301 at no cost to you. 
 
WILL I BE PAID FOR PARTICIPATING? 
You will not be paid for being in this research study.   
 
WHO IS FUNDING THIS STUDY? 
The Foundation for Barnes-Jewish Hospital, the National Institutes of Health (NIH), and Swim Across 
America (through the Siteman Investment Program) as well as Celldex Therapeutics are funding this 
research study.  This means that Washington University is receiving payments from the Siteman 
Investment Program and Celldex to support the activities that are required to conduct the study.  No one 
on the research team will receive a direct payment or increase in salary from the Siteman Investment 
Program or Celldex for conducting this study. 
 
WHAT IF I AM INJURED AS A RESULT OF THIS STUDY? 
Washington University investigators and staff will try to reduce, control, and treat any complications 
from this research. If you feel you are injured because of the study, please contact the investigator at 
(314) 362-7046 and/or the Human Research Protection Office at 1-(800)-438-0445.  
 
Decisions about whether payment for medical treatment for injuries relating to your participation in 
research will be made by Washington University and Celldex Therapeutics.  If you need to seek medical 
care for a research-related injury, please notify the investigator as soon as possible.  
 
HOW WILL YOU KEEP MY INFORMATION CONFIDENTIAL? 
Other people such as those indicated below may become aware of your participation in this study and 
may inspect and copy records pertaining to this research.  Some of these records could contain 
information that personally identifies you. We will keep your participation in this research study 
confidential to the extent permitted by law.   
• Government representatives (including the Office for Human Research Protections) to complete 
federal or state responsibilities 
• The U.S. Food and Drug Administration 
• Celldex Therapeutics (manufacturer of CDX-301 and CDX-1140) 


 
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• Your primary care physician if a medical condition that needs urgent attention is discovered 
• Hospital or University representatives to complete Hospital or University responsibilities 
• Information about your participation in this study may be documented in your health care records 
and will be available to anyone with access to your health care record, including your health 
insurance company.  This information may also be released as part of a release of information 
request. 
• The last four digits of your social security number may be used in hospital or University systems 
to track billing information for research procedures. 
• Washington University’s Institutional Review Board (a committee that oversees the conduct of 
research involving human participants) and the Human Research Protection Office. The 
Institutional Review Board has reviewed and approved this study.  
• The Siteman Cancer Center Clinical Trials Office 
• The Quality Assurance and Safety Monitoring Committee (to monitor the conduct of this study) 
• Any report or article that we write will not include information that can directly identify you.  
The journals that publish these reports or articles require that we share your information that was 
collected for this study with others to make sure the results of this study are correct and help 
develop new ideas for research. Your information will be shared in a way that cannot directly 
identify you. 
 
To help protect your confidentiality, we will make sure that your study information is kept secure. We 
will keep study information in a secure database that requires a username and password. You will have 
an opportunity to ask questions about this study privately. The research location will be in the clinic and 
treatment areas of the Center for Advanced Medicine where precautions are made to protect the privacy 
of all patients, not only research or non-research patients. We will store paper records (those containing 
identifiers and those that are de-identified) in a locked office in a locked suite and we will store 
electronic records (which will contain identifiers) in a password-protected database on a secure server. 
All biologic specimens will be stored in a coded fashion in a restricted-access lab. 
 
The research team will send study results to Celldex Therapeutics.  Information sent to Celldex will not 
be identifiable.  Celldex will use this information to study the safety and effectiveness of the study 
drugs.  In the future, Celldex may continue to use your health information that is collected as part of this 
study. For example, Celldex may combine information from this study with the results of other studies 
to re-analyze the safety and effectiveness of the study medications, to evaluate other products or 
therapies, to develop a better understanding of a disease, or to improve the design of future research 
studies. Celldex may also share information from the study with regulatory agencies in foreign 
countries. 
 
If you receive Medicare benefits, are injured as part of your participation in this research study and 
medical treatment relating to this injury is paid by anyone other than you or your insurance company, 
that payer will need to collect personal information about you.  This information includes your name, 
date of birth, gender, social security number, Medicare identification number and information related to 
this research study. The payer will report this information to the Centers for Medicare & Medicaid 
Services (CMS), the federal agency that oversees the Medicare program, during your participation in the 
study and for as long as the payer is required by CMS to report this information.  If you do not want to 
release your personal or treatment related information you have the right to refuse reimbursement by the 


 
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payer for any research injury.  The payer will not use this information for any other purpose. 
 
The Siteman Cancer Center at Washington University School of Medicine and Barnes-Jewish Hospital 
is supported by funding from the National Cancer Institute (NCI). To meet NCI requirements, your 
protected health information relating to your participation in this study (including your social security 
number) will be stored in a secure database at the Siteman Cancer Center.  This database and also your 
health care records may be reviewed by Siteman Cancer Center personnel.  All information will be 
securely and confidentially maintained.  
 
A description of this clinical trial will be available on http://www.clinicaltrials.gov/, as required by U.S. 
law. This website will not include information that can identify you. At most, the website will include a 
summary of the results. You can search this website at any time. 
 
To further protect your privacy, this research is covered by a Certificate of Confidentiality from the 
federal government. This means that the researchers can refuse to disclose information that may identify 
you in any legal or court proceeding or to anyone who is not connected with the research except if:  
• there is a law that requires disclosure, such as to report child abuse and neglect, or harm to self or 
others;  
• 
you give permission to disclose your information, including as described in this consent form; or 
• it is used for other scientific research allowed by federal law. 
 
This Certificate may not be effective for information held in foreign countries. 
 
You have the right to share your information or involvement in this study with anyone at any time. You 
may also give the research team permission to disclose your information to a third party or any other 
person not connected with the research.  
 
Are there additional protections for my health information? 
Protected Health Information (PHI) is health information that identifies you. PHI is protected by federal 
law under HIPAA (the Health Insurance Portability and Accountability Act). To take part in this 
research, you must give the research team permission to use and disclose (share) your PHI for the study 
as explained in this consent form.  The research team will follow state and federal laws and may share 
your health information with the agencies and people listed under the previous section titled, “How will 
you keep my information confidential?” 
 
Once your health information is shared with someone outside of the research team, it may no longer be 
protected by HIPAA.   
 
The research team will only use and share your information as talked about in this form or as permitted 
or required by law.  When possible, the research team will make sure information cannot be linked to 
you (de-identified).  Once information is de-identified, it may be used and shared for other purposes not 
discussed in this consent form. If you have questions or concerns about your privacy and the use of your 
PHI, please contact the University’s Privacy Officer at 866-747-4975.  
 
Although you will not be allowed to see the study information, you may be given access to your health 
care records by contacting your health care provider.  


 
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If you decide not to sign this form, it will not affect 
• your treatment or the care given by your health provider. 
• your insurance payment or enrollment in any health plans.   
• any benefits to which you are entitled. 
However, it will not be possible for you to take part in the study. 
 
If you sign this form: 
• You authorize the use of your PHI for this research 
• This authorization does not expire. 
• You may later change your mind and not let the research team use or share your information 
(you may revoke your authorization).  
• To revoke your authorization, complete the withdrawal letter, found in the Participant section 
of 
the 
Human 
Research 
Protection 
Office 
website 
at 
https://hrpo.wustl.edu/participants/withdrawing-from-a-study/ or you may request that the 
investigator send you a copy of the letter.    
 
 
 
o If you revoke your authorization: 
 The research team may only use and share information already collected for 
the study. 
 Your information may still be used and shared as necessary to maintain the 
integrity of the research, for example, to account for a participant’s 
withdrawal from the research study or for safety reasons. 
 You will not be allowed to continue to participate in the study. 
 
IS BEING IN THIS STUDY VOLUNTARY? 
Taking part in this research study is completely voluntary.  You may choose not to take part at all.  If 
you decide to be in this study, you may stop participating at any time. Any data that was collected as 
part of your participation in the study will remain as part of the study records and cannot be removed.   
 
If you decide not to be in this study, or if you stop participating at any time, you won’t be penalized or 
lose any benefits for which you otherwise qualify.   
 
What if I decide to withdraw from the study? 
You may withdraw by telling the study team you are no longer interested in participating in the study or 
you may send in a withdrawal letter. A sample withdrawal letter can be found at 
https://hrpo.wustl.edu/participants/withdrawing-from-a-study/ under Withdrawing from a Research 
Study. 
 
If you decide to leave the study early, we will ask you to tell the study doctor if you are thinking about 
stopping so any risks can be evaluated by your doctor. Another reason to tell your doctor that you are 
thinking about stopping is to discuss what follow-up care and testing could be most helpful for you. 
 
Will I receive new information about the study while participating? 
If we obtain any new information during this study that might affect your willingness to continue 
participating in the study, we’ll promptly provide you with that information. 
 


 
FOR IRB USE ONLY 
IRB ID #: 202011125 
APPROVAL DATE: 12/01/23 
RELEASED DATE: 12/01/23 
EXPIRATION DATE: 10/08/24 
 
Version 11/30/23 
Page 14 of 15 
Can someone else end my participation in this study? 
Under certain circumstances, the investigator might decide to end your participation in this research 
study earlier than planned.  This might happen for no reason or because staying in the study would be 
harmful, you need treatment that is not allowed while on the study, you fail to follow instructions, you 
become pregnant, or the study is canceled. 
 
WHAT IF I HAVE QUESTIONS? 
We encourage you to ask questions.  If you have any questions about the research study itself, please 
contact: Dr. Panni at (314) 362-7046.  If you experience a research-related injury, please contact Dr. 
Panni as well; if this is after hours, you will be directed to the exchange number which will be covered 
by a resident or fellow on call. Please tell this person that you are a research participant. 
 
If you have questions, concerns, or complaints about your rights as a research participant, please contact 
the Human Research Protection Office 1-(800)-438-0445, or email hrpo@wustl.edu.   General 
information about being a research participant can be found on the Human Research Protection Office 
web site, http://hrpo.wustl.edu.  To offer input about your experiences as a research participant or to 
speak to someone other than the research staff, call the Human Research Protection Office at the number 
above. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


 
FOR IRB USE ONLY 
IRB ID #: 202011125 
APPROVAL DATE: 12/01/23 
RELEASED DATE: 12/01/23 
EXPIRATION DATE: 10/08/24 
 
Version 11/30/23 
Page 15 of 15 
This consent form is not a contract. It is a written explanation of what will happen during the study if 
you decide to participate. You are not waiving any legal rights by agreeing to participate in this study. 
As a participant you have rights and responsibilities as described in this document and including: 
• To be given enough time before signing below to weigh the risks and potential benefits and 
decide if you want to participate without any pressure from the research team or others. 
• To understand all of the information included in the document, have your questions answered, 
and receive an explanation of anything you do not understand. 
• To follow the procedures described in this document and the instructions of the research team to 
the best of your ability unless you choose to stop your participation in the research study. 
• To give the research team accurate and complete information. 
• To tell the research team promptly about any problems you have related to your participation, or 
if you are unable to continue and wish to stop participating in the research study. 
 
Your signature indicates that this research study has been explained to you, that your questions have 
been answered, and that you agree to take part in this study.  You will receive a signed and dated copy 
of this form. 
 
Do not sign this form if today’s date is after EXPIRATION DATE: 10/08/24. 
 
 
__________________________________________ 
_______________________________ 
(Signature of Participant) 
 
 
 
 
(Date) 
 
 
____________________________________________ 
(Participant's name – printed) 
 
 
 
Statement of Person Who Obtained Consent 
 
The information in this document has been discussed with the participant or, where appropriate, with the 
participant’s legally authorized representative.  The participant has indicated that they understand the 
risks, benefits, and procedures involved with participation in this research study. 
 
 
__________________________________________ 
_______________________________ 
(Signature of Person who Obtained Consent) 
 
(Date) 
 
 
___________________________________________ 
(Name of Person who Obtained Consent - printed)