Cemiplimab for Locally Advanced Cutaneous Squamous Cell Carcinoma: A Case Series of 3 Unique Scenarios

Abstract

Cemiplimab, a monoclonal antibody directed against programmed death receptor 1 (PD-1), has shown promising results in cutaneous squamous cell carcinoma (cSCC). In a nonrandomized trial where cemiplimab 3 mg/kg was given every 2 weeks for up to 96 weeks, a 44% response rate was noted. This case series discusses 3 unique scenarios of patients with advanced cSCC treated with cemiplimab. The first case is of an end stage kidney disease (ESKD) patient with failed living donor kidney transplant who had developed recurrent cSCC despite several excisions and topical 5-flurouracil and acitretin therapy. He received 8 cycles of cemiplimab leading to resolution. This case serves as an example of the safety and efficacy of cemiplimab in a complex patient who is a kidney transplant recipient on hemodialysis. The second case describes an elderly gentleman with inoperable cSCC initially treated with radiotherapy who later received 9 cycles of cemiplimab for recurrent metastatic disease with excellent response. This case supports the safe and effective use of cemiplimab in an elderly patient. In the third case, cSCC presented itself as a large fungating mass that would have otherwise necessitated limb amputation and was successfully treated with 18 cycles of cemiplimab. This case highlights the dramatic response to cemiplimab obviating the need for surgical intervention and resulting in limb salvage.

Keywords: PD-1; cSCC; cemiplimab; cutaneous squamous cell carcinoma; immunotherapy; programmed death receptor 1.