\*\*Primary Objective:\*\* The primary objective of this study is to evaluate the efficacy and safety of liposomal irinotecan in combination with sintilimab and anlotinib in patients with recurrent or persistent ovarian clear cell carcinoma (OCCC).
\*\*Treatment Regimen:\*\*
Participants will receive the following treatment:
* \*\*Liposomal irinotecan:\*\* Initial dose of 50 mg/m²; if well tolerated, the dose will be increased to 70 mg/m² in subsequent cycles. Administered via intravenous infusion on Day 1 of each 3-week cycle.
* \*\*Sintilimab:\*\* 200 mg administered by intravenous infusion (over 30-60 minutes) on Day 1 of each cycle.
* \*\*Anlotinib:\*\* 8 mg orally once daily, starting on Day 1 of each cycle, taken for 2 consecutive weeks followed by a 1-week rest period.
\*\*Follow-up Schedule:\*\* Patients will be followed every 3 months during treatment and within the first year after completion of therapy, every 6 months from Year 2 to Year 5, and annually thereafter. Follow-up assessments will include physical examination, laboratory testing, and imaging studies.