Interdisciplinary Management of Extramammary Paget's Disease Using Mohs Micrographic Surgery With Frozen Section Cytokeratin-7 Immunostains

To describe local recurrence rates and patient-reported outcomes when Mohs micrographic surgery with cytokeratin-7 immunostains (MMS-CK7) is included in the interdisciplinary management of extramammary Paget's disease (EMPD) A retrospective study was conducted of EMPD treated with MMS-CK7 as part of an interdisciplinary team at an academic medical center between 2009 and 2016. Local recurrence rates and patient-reported outcomes were determined by record review and patient surveys. Twenty tumors in 19 patients were treated using MMS-CK7. After MMS-CK7 defined clear microscopic margins, 75% (15/20) of tumors underwent excision or reconstruction by a surgical colleague. Internal malignancy screening was performed by multiple specialties in 17 patients, with 1 associated malignancy of prostate cancer detected. No local recurrence was detected with a mean follow-up of 75.2 months. Most patients were satisfied with appearance (18/19, 95%) and function (16/19, 84%) after surgery. Interdisciplinary teams that include MMS-CK7 can treat EMPD with low local recurrence rates, high patient satisfaction, and thorough internal malignancy screening.