Surgery performed later in the week is associated with inferior survival in advanced ovarian cancer

Background Complete macroscopic resection without any residual tumour after completion of surgery is a strong prognostic factor in advanced epithelial ovarian cancer (EOC). It has previously been reported that surgery performed later in the week is associated with failure to achieve complete macroscopic resection. Our objective was to examine if weekday of surgery influences oncologic outcome. Materials and Methods This population-based observational study included 100% of all women diagnosed with advanced-stage invasive epithelial ovarian cancer between 2009-2011 and 2014-2016 in the Stockholm/Gotland County of Sweden. The association between weekday of surgery and survival was analysed with proportional hazards regression yielding hazard ratios (HR) with 95% confidence intervals (CI), adjusted for predefined confounders. Results Out of 1066 identified women, 524 with advanced stage EOC treated with surgery were included in the final analysis. Surgery performed Wednesday to Thursday was associated with an increased hazard of death (HR 1.28, 95% CI 1.04-1.58, p-value 0.02). The trend of the hazard of surgery performed throughout the week from Monday through Thursday was also significant (p = 0.01). Conclusion The increased mortality associated with surgery that is performed later in the week suggests that surgery for advanced ovarian cancer is best conducted early in the week.