A Study of Nivolumab Combined With Ipilimumab and Nivolumab Alone in Patients With Advanced or Metastatic Solid Tumors of High Tumor Mutational Burden (TMB-H)

Inclusion Criteria: * Participants with a refractory, metastatic, or unresectable histologically or cytologically confirmed solid malignant tumor with high tumor mutational burden (TMB-H) who are refractory to standard local therapies, or for which no standard treatment is available. * Must be able to provide tissue and blood TMB-H testing results * Must have measurable disease for response assessment Exclusion Criteria: * Participants with melanoma, non-small cell lung cancer (NSCLC), renal cell carcinoma (RCC) or hematological malignancy as primary site of disease * Participants who received prior treatment with an anti-programmed death-1 (anti-PD-1), anti-programmed death ligand 1 (anti-PD-L1), anti-programmed death ligand 2 (anti-PD-L2), anti-CD137, or anti-cytotoxic T-lymphocyte-associated protein 4 (anti-CTLA-4) antibody, or any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways * Treatment with any chemotherapy, radiation therapy, biologics for cancer, or investigational therapy within 28 days of first administration of study treatment Other protocol defined inclusion/exclusion criteria apply.