Basal cell carcinoma (BCC) is the most common malignancy worldwide. Fortunately, most tumors are localized and easily amenable to surgical resection or locally destructive treatments. However, a subset of BCCs can become locally advanced or metastatic. The development of small-molecule inhibitors of smoothened, a protein in the hedgehog pathway, which is almost universally activated in BCCs, was a breakthrough in the treatment of patients with advanced BCC. However, these agents are associated with primary and secondary resistance and have a toxicity profile that makes long-term use difficult. The recent approval of cemiplimab for patients with advanced BCC who are resistant to or are intolerant of hedgehog inhibitor therapy fills a significant unmet need as these patients now have a viable, second-line systemic therapeutic option. This article summarizes the rationale and data leading to the approval for cemiplimab in advanced BCC.

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