A Study to Assess the Safety, and Tolerability of Nivolumab + Relatlimab Fixed-Dose Combination (FDC) In Unresectable or Metastatic Melanoma Participants In India

Inclusion criteria

• Participants must have an Eastern Cooperative Oncology Group (ECOG) performance status of ≤ 1/Lansky Performance Score ≥ 80% for minors (ages 12-17) ONLY.

Note: Participants with ECOG PS 2 are allowed if the performance status of 2 is attributable to disease burden (and not to significant comorbidity), and if the investigator and Medical Monitor agree the patient may benefit from treatment.

• Participants must have histologically confirmed Stage III (unresectable) or Stage IV melanoma, per the American Joint Committee on Cancer (AJCC) staging system (8th edition).
• Participants must have measurable disease by Computed Tomography (CT) or Magnetic Resonance Imaging (MRI) per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 criteria.
• Participants must have completed prior radiotherapy at least 2 weeks prior to study treatment administration.
• Individuals of Childbearing Potential (IOCBP) must not be pregnant or breastfeeding.

Exclusion criteria

• Participants must not have active brain metastases or leptomeningeal metastases.
• Participants must not have uveal melanoma.
• Participants must not have an active, known, or suspected autoimmune disease.

Note: Participants may enroll with the following conditions:

i) type 1 diabetes mellitus; ii) hypothyroidism only requiring hormone replacement; iii) skin disorders (such as vitiligo, psoriasis, or alopecia) not requiring systemic treatment; iv) conditions not expected to recur in the absence of an external trigger are permitted to enroll.

• Participants must not have a condition requiring systemic treatment with either corticosteroids (> 10 mg daily prednisone equivalent) or other immunosuppressive medications within 14 days of start of study treatment.

Note: Inhaled or topical steroids, and adrenal replacement steroid doses > 10 mg daily prednisone equivalent, are permitted in the absence of active autoimmune disease.

• Participants must not have a history of myocarditis.
• Other protocol-defined Inclusion/Exclusion criteria apply.