Prognostic influence of an early time to chemotherapy following primary cytoreductive surgery for advanced epithelial ovarian cancer.

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.