The study will consist of two parts : In the phase Ib: safety will be assessed in consecutive cohorts of 3 to 6 participants at increasing doses of TG4001 in combination with avelumab according to a 3+3 design. There will be no intra-participant dose escalation. In the phase II part 1, evaluation of efficacy and further evaluation of safety of the combination of TG4001 and avelumab will be performed in a single arm of participants with recurrent or metastatic HPV-16 positive advanced malignancies. In the phase II part 2, evaluation of efficacy of the combination of TG4001 and avelumab will be performed in a randomized, open-label controlled study comparing TG4001 in combination with avelumab to avelumab alone in participants with HPV-16 positive advanced malignancies. In both phases, evaluation of tumor response will be done locally according to RECIST 1.1. All participants will be followed up until disease progression, death, or unacceptable toxicity, or study withdrawal for any reason, whichever occurs first.
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Phase Ib: To Evaluate the Safety and Tolerability of the Combination of TG4001 Plus Avelumab in Participants With Recurrent or Metastatic HPV-16 Positive Advanced Malignancies
Timeframe: From Day 1 to Day 28
Phase II Part 1: Overall Response Rate (ORR) by RECIST 1.1
Timeframe: From treatment start, every 6 weeks for the first 9 months, then every 12 weeks up to 2 years.
Phase II Part 2 Cohort A: Progression Free Survival (PFS) by RECIST 1.1
Timeframe: From randomization: Every 6 weeks for the first 9 months, then every 12 weeks through study completion, for an average of 1 year.
Progression Free Survival (PFS) Phase II Part 2 Cohort A by Stratification
Timeframe: From randomization: Every 6 weeks for the first 9 months, then every 12 weeks through study completion, for an average of 1 year.