LAUSR

Objective The current investigation analyzes the prognostic role of the time to chemotherapy (TTC) interval following primary cytoreductive surgery for patients with advanced epithelial ovarian cancer. Methods Characteristics and outcome data for 509 consecutive patients with stage IIIB–IVB ovarian, fallopian tube, and peritoneal cancer who had primary cytoreductive surgery between January 2000 and December 2019 are utilized. A univariate Cox regression determined the association of categorical variables with progression-free survival (PFS) and overall survival (OS). Significant variables (p≤0.05) on univariate analysis were applied to Cox proportional hazard regression. Results The median TTC was 19 days and overall follow-up was 62.2 months. The PFS and OS were 25.5 months and 78.4 months for the study cohort plus 28.4 months and OS 84.5 months for patients rendered grossly disease-free. An early TTC (7–14 vs. 15–21 vs. 22–28 vs. >28 days) was associated with an improved PFS (41.7 vs. 30.6 vs. 18.9 vs. 17.9 months; p<0.001) and OS (132.7 vs. 104.6 vs. 56.5 vs. 48.0 months; p<0.001). The performance status, histology, disease distribution, dimension of residual disease, and categorical plus continuous TTC were predictors of PFS and OS. The use of maintenance therapy was also a predictor of PFS, and the route of chemotherapy administration was a predictor of OS. Conclusions For advanced epithelial ovarian cancer, a TTC of less than 21-days was observed to independently improve the PFS and OS. A 7–14 days TTC trended towards a further extension of the OS.