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Pembrolizumab demonstrated clinically meaningful and durable antitumor activity with a manageable safety profile in recurrent/metastatic (R/M) cutaneous squamous cell carcinoma (cSCC). KEYNOTE-629 was a global, open-label, nonrandomized, phase II trial of patients with locally advanced (LA) or R/M cSCC conducted at 59 centers. Eligible patients received intravenous pembrolizumab 200 mg every 3 weeks for up to 35 cycles. Primary endpoint was objective response rate (ORR), defined as the percentage of patients with a complete (CR) or part