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Primary ovarian squamous cell carcinoma is uncommon, and the optimal treatment strategy for this disease has not yet been established. A 71-year-old woman diagnosed with FIGO stage IIb pure ovarian squamous cell carcinoma underwent cytoreductive surgery followed by combination chemotherapy with paclitaxel and carboplatin. After the second treatment course, a recurrent mass grew rapidly, and serum tumor maker levels increased. Monotherapy with weekly irinotecan was then instituted. This second-line chemotherapy was remarkably effective, and the patient subsequently underwent complete interval debulking surgery with a pathological complete response after the third treatment course. Weekly irinotecan is an effective choice for primary ovarian squamous cell carcinoma resistant to combination chemotherapy with paclitaxel and carboplatin.

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