Effect of time to surgical intervention in stage 3 cutaneous melanoma.

e21571 Background: Delay in surgical resection has been found to be associated with poorer overall survival (OS) in patients with stage 1 cutaneous melanoma. However, the impact of surgical timing on survival in stage 3 cutaneous melanoma remains unknown, especially in the era of immunotherapy. We sought to evaluate to the effect of time to definitive surgical intervention on OS in stage 3 cutaneous melanoma at Commission on Cancer accredited institutions. Methods: The National Cancer Database (2012-2016) was used to identify patients who underwent biopsy and definitive surgical intervention of cutaneous melanoma. Time to intervention (TTI) was analyzed from the time of initial biopsy to definitive surgical resection and classified into quartiles, (Q1≤22 days; Q2 = 23-33 days; Q3 = 34-49 days; Q4≥50 days) using χ2 and multivariable logistic regression. Survival was analyzed using Kaplan-Meier and Cox proportional hazard models. Results: We analyzed 4560 patients with a median age of 61 years (18-90) and most patients being non-Hispanic white and male (91.6% and 63%, respectively). Median Breslow thickness was 2.8 mm (0-9.8 mm). Median TTI was 33 days (0-352 days) with a mean OS of 52, 49.8, 48.4, 48.3 months for Q1 to Q4 respectively (p = 0.008). Age ≤50 years, treatment at a comprehensive community cancer center and only 1 positive lymph node (LN) were all associated with Q1 TTI (p = 0.002, p < 0.001 and p < 0.001, respectively). Black race, treatment at an academic facility, > 4 LN positive, > 4 mm thickness, and no administration of immunotherapy were all associated with Q4 TTI (p = 0.002, p < 0.0001, p < 0.0001, p < 0.0001 and p < 0.0001 respectively) on univariate analysis. Patients in Q4 TTI were more likely to be older (OR 1.01, 95% CI 1.00-1.02, p = 0.01), have T2-T4 tumors (OR 1.6, 95% CI 1.2-2.2, p < 0.001), and be treated at an academic facility (OR 2.4, 95% CI 1.8-3.5, p < 0.001) on multivariable analysis. In the survival analysis, multiple positive LNs (2, 3-4, > 4 LNs; HR 1.4, 1.6 and 2.9, p < 0.001), lymphovascular invasion (HR 1.4, p < 0.001), Breslow thickness > 4 mm (HR 1.7, p < 0.001), Charlson-Deyo score ≥2 (HR 1.5, p < 0.001), increasing age (HR 1.03, p < 0.001), and longer TTI (Q3-Q4) (HR 1.2, p = 0.001) were all associated with worse OS. There was no difference in survival based on TTI in patients who had received adjuvant immunotherapy in Q1-Q2 vs Q3-Q4 (p = 0.3). Conclusions: In stage 3 cutaneous melanoma, longer TTI ( > 33 days) was associated with worse OS but may be due to older age, higher T stage, and barriers to access. However, adjuvant immunotherapy may offer protection from delays in definitive surgery.