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HIPEC at interval cytoreductive surgery

Heated intraperitoneal cisplatin during interval surgery, after neoadjuvant chemotherapy, extends survival in stage III disease.

OVHIPEC-1: OS 45.7 vs 33.9 months (HR 0.67) without extra major complications, confirmed at 10 years. Benefit appears specific to the interval-surgery setting; primary-surgery HIPEC (OVHIPEC-2) is still being tested.

Rationale
Direct high-dose exposure of residual microscopic peritoneal disease at the moment of maximal cytoreduction, with hyperthermia enhancing platinum uptake.
Evidence
Phase 3 with OS benefit; one supportive Korean trial.

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