Do Not Forget Poly (Adenosine Diphosphate-Ribose) Polymerase Inhibitors in Ovarian Carcinosarcoma.

Ovarian carcinosarcoma (OCS) is a rare entity with a poor prognosis and without evidence-based therapy. Here, we report the case of a 55-year-old woman with a germline mutation and a stage IV OCS who was proposed olaparib maintenance therapy after three platinum-based chemotherapies in relapsed disease. Currently, the patient has an overall survival of 102 months and progression-free survival of 60 months with olaparib, with a good quality of life and not experiencing any adverse events. Despite the lack of evidence for the use of poly (adenosine diphosphate-ribose) polymerase inhibitors in OCS, our case report proves that patients with a potential biomarker of response to these drugs (such as mutation and platinum-sensitive disease) derive great benefits from it.