Benmelstobart in Combination With Anlotinib and Oral Metronomic Cyclophosphamide in the Treatment of Recurrent Epithelial OvariaN, Fallopian Tube, or Primary Peritoneal Cancer

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• 1.The age on the day of signing the informed consent form is 18 years or older. 2.Eastern Cooperative Oncology Group performance status of 0-1, with the ability to tolerate chemotherapy.
  • 3.There is measurable disease according to the RECIST 1.1 or irRECIST criteria. 4.The histological types can be serous, endometrioid, clear cell, mucinous or undifferentialed types of recurrent epithelial ovarian cancer, fallopian tube cancer or primary peritoneal cancer. The original primary tumor needs to be histologically confirmed through the pathological report.
  • 5.Participants can be either platinum-sensitive (with a platinum-free interval(PFI) of ≥6 months before the recent recurrence) or platinum-resistant (with a PFI of <6 months before the recent recurrence). If the participant has a platinum-sensitive disease, they can only participate in this clinical trial with platinum-based chemotherapy contraindications (such as severe persistent toxicity or a severe hypersensitivity reaction to platinum drugs, or refuse standard treatment).
  • 6.The participants must be willing to undergo hollow needle biopsy or excisional biopsy of tumor lesion within 4 weeks (28 days) before the start of the treatment and after 3 cycles treatment. For participants who are unable to provide new samples (for example, unable to obtain or there are issues related to the safety of the participants), only with the consent of the principal investigator can archived samples be submitted.