Factors influencing time between biopsy and definitive surgery for malignant melanoma: do they impact clinical outcome?

Background: Whether time between biopsy and surgery for malignant melanoma affects clinical outcomes is sparsely defined. This study evaluated factors influencing surgical interval and surgical interval effect on outcomes. Methods: We performed a review of a prospective 10-year, single-institution database. Results: There were 473 patients treated for 478 malignant melanomas. The mean surgical interval was 30.5 days. The mean thickness was 2.1 mm; 46% of patients had a surgical interval of more than 28 days whereas 8% had a surgical interval of more than 56 days. Residual melanoma was found at excision in 170 (36%) patients. Age, sex, and referral source significantly affected surgical interval, however, lesion thickness, sentinel lymph node status, ulceration, and residual melanoma at excision did not. In univariate Cox models, neither a surgical interval of 28 or less nor less than 56 days showed better overall survival (OS) or disease-free survival (DFS). In multivariate Cox models of OS and DFS including lesion thickness, sentinel lymph node status, ulceration, and residual melanoma at excision, neither a surgical interval of 28 days or fewer nor a surgical interval of 56 days or fewer significantly affected outcomes. Conclusions: Age, sex, referral source, and lesion thickness were associated with surgical interval. Immediate surgery for malignant melanoma does not significantly impact OS or DFS.