A Study to Assess Safety, Tolerability and Drug Levels of Navlimetostat (BMS-986504) in Participants With Advanced Solid Tumors

Inclusion Criteria: * Participants must have histologically confirmed diagnosis of a solid tumor malignancy with homozygous MTAP deletion or MTAP loss detected in tumor tissue by a Sponsor-provided central test or a Sponsor pre-approved local test. * Participants must have unresectable or metastatic disease not amenable to curative therapies after progression on prior therapies at the time of enrollment. * Participants must have Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. * Participants must have presence of at least one measurable tumor lesion per RECIST 1.1 at baseline. Exclusion Criteria: * Participants must not have prior treatment with a Protein arginine methyltransferase 5 (PRMT5) or Methionine adenosyltransferase 2A (MAT2A) inhibitor. * Participants must not have active brain metastases or carcinomatous meningitis. * Participants must not have a history of gastrointestinal disease or other gastrointestinal conditions (e.g., uncontrolled nausea, vomiting, malabsorption syndrome) likely to alter absorption of study treatment or result in inability to swallow oral medications. * Participants must not have known severe hypersensitivity to study treatment and/or any of its excipients. * Other protocol-defined Inclusion/Exclusion criteria apply.