Merkel cell carcinoma (MCC) is a rare, aggressive neuroendocrine skin cancer associated with Merkel cell polyomavirus (MCPyV) in ~80% of cases and UV exposure. It has high metastatic potential and poor prognosis in advanced stages. Treatment includes surgery (wide local excision), radiation therapy, immunotherapy (checkpoint inhibitors: avelumab, pembrolizumab), chemotherapy (limited role), and...