Pembrolizumab and Radiotherapy for Platinum-refractory Recurrent Uterine Carcinosarcoma With an Abscopal Effect: A Case Report

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...

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Bibliographic Details
Published in:Anticancer research 2020-07, Vol.40 (7), p.4131-4135
Main Authors: Yano, Mitsutake, Aso, Saki, Sato, Miho, Aoyagi, Yoko, Matsumoto, Harunobu, Nasu, Kaei
Format: Article
Language:English
Subjects:
Carboplatin
Case reports
Chemotherapy
Combinatorial analysis
Computed tomography
Endometrial cancer
Endometrium
Immune checkpoint inhibitors
Immune response
Immunotherapy
Inhibitors
Lymph nodes
Metastases
Metastasis
Microsatellite instability
Monoclonal antibodies
Paclitaxel
Pembrolizumab
Platinum
Radiation therapy
Surgery
Synergistic effect
Targeted cancer therapy
Tumors
Uterus
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Summary: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.
ISSN:0250-7005
1791-7530
DOI:10.21873/anticanres.14412