This study will not exceed 100 participants. Participants will be reevaluated annually to assess the treatment benefit of zalifrelimab and/or balstilimab and thereby, continued eligibility for treatment. Under this program, treatment will be continued with balstilimab, as either monotherapy or as used in combination therapy with zalifrelimab, for participants that have previously received one or both of these investigational medicinal products in a clinical study.
