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Importance: The incidence of melanoma in situ (MIS) has increased significantly over the past decades, and traditional guidelines for treatment of MIS have been excision with a 5-mm clinical margin; however, current Australian and other guidelines now recommend 5- to 10-mm margins. This changed recommendation was largely driven by the outcomes of studies using Mohs micrographic surgery, and recent studies using Mohs micrographic surgery are advocating for even wider excisions up to 18 mm for clearance., Objective: To assess the rate of recurrence of MIS excised with a 5-mm margin., Design, Setting, and Participants: This case series studied all MIS lesions from a single private dermatology clinic between January 1, 2011, and November 30, 2018. The criteria for inclusion were a documented 5-mm excisional margin on operation report and more than 5 years of site-specific follow-up after wide local excision. Lesions were excluded if the excisional margin was more than 5 mm or undocumented, there was less than 5 years of follow-up, or they required more than 1 wide local excision. Data analysis was performed January 30 to February 25, 2024., Intervention: Wide local excision with 5-mm margin., Results: A total of 351 MISs were identified from 292 patients (mean [SD] age, 60.3 [11.8] years; 162 females [55.5%]). Superficial spreading melanoma was the most common subtype diagnosed (177 lesions [50.4%]), followed by lentigo maligna (107 lesions [30.5%]) and lentiginous MIS (67 lesions [19.1%]). The trunk was the most common location of lesions (168 lesions [47.9%]), followed by upper limb (96 lesions [27.4%]) and lower limb (59 lesions [16.8%]). Scalp was the least common location (2 lesions [0.6%]). Most of the lesions were small, with 274 lesions (78.1%) having a length less than 10 mm and 312 lesions (88.9%) having a width less than 10 mm. A total of 348 lesions (99.1%) did not have clinical recurrence after excision with a 5-mm clinical margin following then current guidelines. A total of 3 lesions (0.9%) experienced local recurrence with no metastatic spread., Conclusions and Relevance: This case series found that excision with a 5-mm margin for MIS of smaller size (<10 mm) on low-risk body sites had a low rate of recurrence. Conservative 5-mm excisional margin is likely to be suitable for small MIS on lower-risk body sites.

Background: As the availability of Mohs micrographic surgery (MMS) continues to expand in Australia and incidence of keratinocyte cancer increases in adolescents and young adults, there has been rising interest in the use of MMS in this population., Objective: This study aimed to evaluate the characteristics of MMS cases in patients younger than 40 years., Methods: A review was performed of all MMS cases in patients younger than 40 years at the time of their surgery from 2012 to 2017 at the Skin and Cancer Foundation Australia, with comparison to a control group, aged older than 40 years. Patient, tumor and management characteristics were analyzed., Results: Four hundred ninety-three cases were eligible. Study and control groups differed significantly regarding gender (p < .001), tumor pathology (p < .001), anatomic site of tumor (p < .001), Mohs surgery stages (p = .039), defect size (p < .001), and repair method (p < .001)., Limitations: Retrospective study at a single institution., Conclusion: Mohs micrographic surgery cases in patients younger than 40 years exhibit unique patient and tumor characteristics influencing choice of repair method.

Background: Sebaceous adenocarcinomas are rare and potentially aggressive tumors, which typically arise in the periocular region. Surgical treatments for eyelid sebaceous adenocarcinomas include Mohs micrographic surgery (MMS) and wide local excision (WLE). The objective of this study was to compare long-term survival outcomes of MMS versus WLE techniques for eyelid sebaceous adenocarcinomas., Methods: A retrospective analysis was performed using data obtained from the Surveillance, Epidemiology, and End Results (SEER) cancer registry database. We analyzed cases diagnosed from 1998 to 2015 within the database. Patients diagnosed with sebaceous adenocarcinoma were identified using ICD codes. Cases were limited to primary sebaceous adenocarcinomas involving specifically the eyelid region. The main outcomes were assessed by Kaplan-Meier (KM) survival and Cox proportional hazards model., Results: Sixty-seven cases of MMS were compared with 114 cases of WLE for eyelid sebaceous carcinoma. Overall KM survival rates for MMS compared to WLE at 5-year (75.6% vs. 70.3%) and 10-year follow-up (69.2% vs. 46.9%) did not show significant difference by logrank (P = 0.062). Similarly, after adjusting for demographic, tumor, and treatment characteristics, there was no significant difference in cancer-specific survival (HR 0.45, 95% CI 0.03-6.92, P = 0.57) and overall survival (HR 0.94, 95% CI 0.50-1.74, P = 0.83) when MMS surgical technique was compared with WLE techniques., Conclusions: Our adjusted analyses demonstrated no differences in overall survival or cancer-adjusted survival for patients with eyelid sebaceous adenocarcinomas treated with MMS compared with WLE. In areas requiring preservation of tissue because of cosmetic or functional purposes, MMS is a reasonable surgical approach., (Copyright © 2019 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.)