Epidemiology, survival, and risk of subsequent primary malignancies in patients with digital papillary adenocarcinoma: a retrospective study of 213 patients in the Surveillance, Epidemiology, and End Results (SEER) Program.

Digital papillary adenocarcinoma (DPAc) is a rare, aggressive cutaneous malignancy of sweat gland derivation. Herein, we conduct a retrospective study of 213 DPAc patients using the 17 registries of the Surveillance, Epidemiology, and End Results (SEER) program. We estimate the incidence of DPAc to be 0.11 per million persons per year, with the incidence rising over the past two decades. Our study shows DPAc to most commonly afflict White males, typically in their 40s-60s. We note a 5-year disease-specific survival of 98.3% and 5-year overall survival of 95.7%. We also show advanced age to be associated with more aggressive disease and identify tumor size as an independent risk factor impacting disease-specific survival. Our results also suggest that patients with DPAc have an elevated risk of developing subsequent primary malignancies, with males being at increased risk of developing lung/bronchial neoplasms and females being at increased risk of developing breast cancer.