Assessment of PK Similarity of FYB206 in Comparison With Keytruda in Resected Stage II or III Melanoma Patients

Inclusion Criteria: * Patients with Stage IIB, IIC, or III histologically confirmed cutaneous melanoma (as classified by the American Joint Committee on Cancer \[AJCC\]'s Cancer Staging Manual, 8th Edition) who have undergone complete resection within 12 weeks before randomization. No evidence of past or current satellites or in-transit metastases. * Disease status for the post-surgery baseline assessment must be documented by full chest/abdomen/pelvis computed tomography (CT) and/or magnetic resonance imaging (MRI) with neck CT and/or MRI (for head and neck primaries) and must have completed a clinical examination after the informed consent form has been signed and before enrollment. * Eastern Cooperative Oncology Group performance status (ECOG PS) of 0 or 1. * Caucasian adult patients ≥18 years of age on the day of signing the informed consent. Exclusion Criteria: * History of radiation therapy for melanoma before trial entry. Post-lymph node dissection radiotherapy is allowed; however, this should be completed at least 7 days before treatment starts. * Uveal or ocular melanoma. * Diagnosis of immunodeficiency or receiving long-term systemic steroid therapy (\>10 mg/day of prednisone or equivalent) or any other form of immunosuppressive therapy ≤7 days before the first dose of IMP. * Received prior therapy with an anti-cytotoxic T-lymphocyte antigen-4 (CTLA-4) monoclonal antibody (eg, ipilimumab), anti-programmed cell death 1 (PD-1), anti-programmed cell death ligand 1 (PD-L1), or anti-programmed cell death ligand 2 (PD-L2) agent or agent directed to another stimulatory or co-inhibitory T-cell receptor. * Received prior systemic anticancer therapy for melanoma.