Phase Ib/II of TG4001 and Avelumab in HPV16 Positive R/M Cancers

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.