研究目的：
This is a prospective, interventional, single-arm, open-label, phase II study to evaluate the safety and efficacy of niraparib monotherapy as neoadjuvant therapy in patients with advanced ovarian cancer, primary peritoneal cancer, fallopian tube cancer ((FIGO stage III or IV), who can not achieve R0 tumor reduction surgery after imaging evaluation or laparoscopic evaluation or can not tolerate surgery.
