Melanomas of the head and neck have high-local recurrence risk features and require tissue-rearranging reconstruction more commonly than basal cell carcinoma and squamous cell carcinoma: A comparison of indications for microscopic margin control prior to reconstruction in 13,664 tumors

Background: On the basis of high -local recurrence risk features and tissue-rearranging reconstruction, consensus guidelines recommend microscopic margin control for keratinocyte carcinomas (KCs) but not for cutaneous melanoma. Objective: To compare high -local recurrence risk features and frequency of tissue-rearranging reconstruction for head and neck KC with those for melanoma. Methods: Retrospective cohort study of KC versus melanoma treated at the Hospital of the University of Pennsylvania with Mohs micrographic surgery. Results: A total of 12,189 KCs (8743 basal cell carcinomas and 3343 squamous cell carcinomas) and 1475 melanomas (1065 melanomas in situ and 410 invasive melanomas) were identified from a prospectively updated Mohs micrographic surgery database. Compared with KCs, melanomas were significantly more likely to have high -local recurrence risk features, including larger preoperative size (2.10 cm vs 1.30 cm [P < .0001]), recurrent status (5.08% vs 3.91% [P = .031]), and subclinical spread (31.73% vs 26.52% [P <.0001]). Tissue-rearranging reconstruction was significantly more common for melanoma than for KCs (44.68% vs 33.02% [P < .0001]; odds ratio, 1.98 [P < .0001]). Limitations: This was a retrospective study, and it did not compare outcomes with those of other treatment methods, such as slow Mohs or conventional excision. Conclusion: Melanomas of the head and neck have high-local recurrence risk features and require tissue rearranging reconstruction more frequently than KCs do.