Dermatofibrosarcoma protuberans: our 10-year experience on 80 patients.

Dermatofibrosarcoma protuberans (DFSP) is a rare soft tissue sarcoma. Its high recurrence rate is a clinical challenge. To analyze DFSP clinicopathologic factors and review our experience of treatments. A total of 80 patients who were treated between 2007 and 2017 in Shanghai Ninth People's Hospital were evaluated. Outcomes were compared focusing on recurrence following different treatment methods. Classical DFSP and transformed DFSP were classified as the two subtypes. The recurrence rate after local excision was significantly higher than that after wide margin excision. Patients undergoing wide margin excision (margins over 3 cm) were found to have lower recurrence rate compared with those margins less than 3 cm, while 10 underwent Mohs surgery were not found recurrence. Transformed DFSP had a greater tendency to recur. Clean margin of excision should be achieved to prevent recurrence of DFSP. Slow Mohs surgery is recommended to treat DFSP.