Study Evaluating the Safety Feasibility and Efficacy of ODI-2001 Vaccine, a Personnalized Immunotherapy in Patients With Metastatic or Locally Advanced Colon Cancer or Pancreatic Cancer

ECOG performance status 0 or 1

Baseline Tumoral evaluation (thoraco-abdomino-pelvic computed tomography) performed before the initiation of the standard first line-chemotherapy with at least one measurable lesion according to RECIST 1.1 criteria that can be accurately assessed at baseline and is suitable for repeated assessment.

Eligible to start a standard first line chemotherapy indicated in colorectal cancer (FOLFOX/FOLFIRI/FOLFIRINOX or FOLFOXIRI +/- anti-VEGF/EGF) pancreatic cancer (FOLFIRINOX/NabPaclitaxel-Gemcitabine).

Adequate haematological, renal and hepatic laboratory requirements : • Haemoglobin \> 9.0 g/dL • White Blood Cells (WBC) \> 2.5x109/L including, absolute neutrophils count (ANC) \> 1.5x109/L, total lymphocytes count \> 0.5x109/L • Platelet's count \> 100x109/L• Serum alkaline phosphatase (PAL) ≤ 3 x ULN in the absence of liver or bone metastases and ≤ 5 x ULN in patients with documented bone or liver metastases• Serum transaminases (alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 2.5 x ULN in the absence of liver metastases and ≤ 5 x ULN in case of liver metastases

• Total bilirubin ≤ 1.5 x ULN• Albumin ≥ 30 g/L • Glomerular Filtration Rate ≥ 50 mL/min (according to Modification of the Diet in Renal Disease \[MDRD\] formula or Cockroft \& Gault formula)

Adequate cardiac function with QTc \< 450 msec on baseline ECG, using the Fridericia correction cQTcF formula

Life expectancy of at least 6 months

Patient willing and able to comply with scheduled visits and exams during the follow-up and treatment compliance of the protocol, for the duration of the study including : • mandatory blood sampling (3 blood sampling) • mandatory biopsy of the tumor following enrolment in STEP 1 if no archived material dated less than 2 years is available in sufficient quality or quantity and a mandatory biopsy at 2 months after the initiation of ODI-2001 vaccine administration.

Men who are sexually active with women of childbearing potential must agree to use contraceptive method during the ODI-2001 treatment period and for at least 4 months after the last ODI-2001 administration. The individual methods of contraception may be determined in consultation with the investigator and it must have a failure rate of less than 1% per year.

A female participant is eligible to participate if she is not pregnant (negative urinary or serum pregnancy test), not breastfeeding, and at least one of the following conditions applies: • Not a woman of childbearing potential OR • Women of childbearing potential who agrees to apply effective contraception method during the treatment period and for at least 4 months after the last dose of study treatment. Effective contraception methods include a combination of any of the following (unless method is abstinence or sterilization, in which only one method is required): - Use of oral, injected, or implanted hormonal methods of contraception, or other forms of hormonal contraception that have comparable efficacy (failure rate \< 1%). In case of use of oral contraception, women should have been stable on the same pill for a minimum of 6 months before taking study treatment. - Placement of an intrauterine device or intrauterine system. - Barrier methods of contraception: condom or occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/vaginal suppository. - Total abstinence - Female sterilization at least eight weeks before taking study treatment. - Male sterilization (at least six months prior to screening)

Patient must be affiliated to a social health insurance regimen

Patients with \>10% hepatic involvement as per investigator

Exposure to any investigational agent within 30 days of enrolment.

Concurrent enrolment in another clinical study, unless it is an observational (non-interventional) clinical study or during the follow-up period of an interventional study

History of any second malignancy within 2 years with the exception of malignancies with a negligible risk of metastasis or death (e.g. adequately treated carcinoma-in situ of the breast or the cervix, melanoma-in-situ, prostate cancer with Gleason grade ≤6 and prostate specific antigen within normal range).

Known or suspected history of immunosuppression (severe auto-immune or immunodeficiency disease) including history of invasive opportunistic infections (e.g tuberculosis, histoplasmosis, listeriosis, coccidioidomycosis, pneumocystis, aspergillosis) despite infection resolution. Presence or suspicion of active bacterial, fungal or viral infections, or uncontrolled fever

Patients with major surgery within 4 weeks from enrolment

Previous vaccination (either therapeutic and/or prophylactic) against cancer

What this study is about