Changes of intestinal flora in patients with epithelial ovarian cancer treated with PARP inhibitor first-line maintenance therapy: a non-randomized, double-blind, observational cohort study

Interventions: Follow-up observation group:no;A drug maintenance treatment group:no;Two kinds of drugs maintenance treatment group:no Primary outcome(s): 16s rRNA sequencing results;Evaluation of therapeutic response in solid tumors Study Design: Cohort study