PT - JOURNAL ARTICLE AU - YANO, MITSUTAKE AU - ASO, SAKI AU - SATO, MIHO AU - AOYAGI, YOKO AU - MATSUMOTO, HARUNOBU AU - NASU, KAEI TI - Pembrolizumab and Radiotherapy for Platinum-refractory Recurrent Uterine Carcinosarcoma With an Abscopal Effect: A Case Report AID - 10.21873/anticanres.14412 DP - 2020 Jul 01 TA - Anticancer Research PG - 4131--4135 VI - 40 IP - 7 4099 - http://ar.iiarjournals.org/content/40/7/4131.short 4100 - http://ar.iiarjournals.org/content/40/7/4131.full SO - Anticancer Res2020 Jul 01; 40 AB - Background: Immune responses due to radiotherapy and immune checkpoint inhibitors potentially have synergistic effects. Case Report: Here, we report a 65-year-old Japanese woman presenting with high-grade endometrial cancer. She was diagnosed with carcinosarcoma, stage IB. A month post-surgery, lung, and mediastinal lymph node metastasis/recurrence was detected. Progressive disease (with high microsatellite instability) with local recurrence and bone metastasis was detected after six chemotherapy cycles with paclitaxel and carboplatin. After combination therapy with pembrolizumab (2 mg/kg, tri-weekly, 10 cycles) and pelvic radiotherapy (30 Gy/10 fractions), enhanced computed tomography revealed a complete response. The patient survived for 14 months with the residual tumour post-relapse. This is the first case of a complete response of recurrent endometrial carcinosarcoma upon combinatorial pembrolizumab and radiotherapy. Conclusion: Combinatorial immune checkpoint inhibitors and local radiotherapy cause the abscopal effect and may be a promising treatment strategy for advanced or recurrent carcinosarcomas refractory to traditional chemotherapy.