Bossart, Simon; Daneluzzi, Cloé; Moor, Matthias B; Hirzel, Cédric; Heidemeyer, Kristine; Jafari, S Morteza Seyed; Hunger, Robert E; Sidler, Daniel (2023). HPV Vaccination in Immunosuppressed Patients with Established Skin Warts and Non-Melanoma Skin Cancer: A Single-Institutional Cohort Study. Vaccines, 11(9) MDPI 10.3390/vaccines11091490
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cSCC (cutaneous squamous cell carcinoma) and its precursors are a major cause of morbidity, especially in immunosuppressed patients, and are frequently associated with human papillomavirus (HPV) infections. The purpose of this study is to investigate the therapeutic potential of alpha-HPV vaccination for immunosuppressed patients with established cSCC and its precursors. In this retrospective study, all patients who received Gardasil-9®, a nonavalent HPV vaccine, as secondary prophylaxis were examined. Dermatologic interventions in both the pre- and post-vaccination periods were analyzed with zero-inflated Poisson regression and a proportional intensity model for repeated events with consideration of the clinically relevant cofactors. The hazard ratio for major dermatologic interventions was 0.27 (CI 0.14-0.51, p < 0.001) between pre- and post-Gardasil-9® intervention. Gardasil-9® vaccination showed good efficacy in reducing major dermatologic interventions even after correction of relevant cofactors and national COVID-19 caseloads during the observational period. Alpha-HPV vaccination may potentially cause a significant decrease in dermatologic interventions and overall mortality as well as healthcare costs in immunosuppressed patients with high skin tumor burden.