Surveillance, Epidemiology, and End Results (SEER) Database Analysis of Microcystic Adnexal Carcinoma (Sclerosing Sweat Duct Carcinoma) of the Skin

Background:Microcystic adnexal carcinoma (MAC) is a very rare cancer of the skin. It has only been described previously in case reports and small retrospective series. Objective:To analyze and summarize data from the National Cancer Institute, Surveillance, Epidemiology, and End Results (SEER) database regarding MAC. Methods:The SEER 1973 to 2004 database was investigated, and patients with MAC were identified. A statistical analysis was performed. Results:Two hundred twenty-three patients were identified. Predominant site of disease was the head and neck skin (74%). There was only 1 case of recorded metastatic disease. Lymph nodes were pathologically involved in 1%. The 10-year overall survival was 86.4% (Standard Error [SE]: 3.3%). US census population-matched relative survival was 97.7% at 10 years (SE: 5.2%). Limitations:This study is limited by the retrospective nature of the SEER database. Conclusions:MAC is locally invasive, and rarely metastasizes to lymph nodes. Overall and population-matched relative survival is excellent.

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