PMID- 37577341 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230928 IS - 2192-3183 (Electronic) IS - 2192-3183 (Linking) VI - 12 IP - 4 DP - 2023 Oct TI - Gastric neuroendocrine carcinoma presenting complete durable response by nivolumab treatment for multiple metastases and radiotherapy to oligoprogressive metastasis. PG - 268-273 LID - 10.1007/s13691-023-00611-z [doi] AB - Gastric neuroendocrine carcinomas (NEC) are highly aggressive cancer with dismal prognosis. Platinum-based chemotherapy is used as the first-line treatment for this entity. However, there are no established therapeutic guidelines for platinum-resistant gastric NEC. We herein report a patient with metastatic gastric NEC who achieved durable and complete response to nivolumab with radiotherapy for oligoprogressive metastasis. A 70-year-old male patient had recurrences of resected gastric NEC, involving the liver and lymph nodes. His disease became refractory to cisplatin and etoposide combination therapy, after which he was treated with nivolumab. All the tumors showed marked shrinkage. However, 1 year after starting nivolumab, one metastatic lesion of the liver began to enlarge, and radiotherapy was performed to the lesion. Thereafter, a complete response was obtained, which has been maintained without any treatment for the past 2 years. CI - (c) The Author(s) under exclusive licence to The Japan Society of Clinical Oncology 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. FAU - Seyama, Yusuke AU - Seyama Y AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Yamada, Takeshi AU - Yamada T AUID- ORCID: 0000-0001-7848-5827 AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Suzuki, Hirosumi AU - Suzuki H AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Fukuda, Satoshi AU - Fukuda S AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Tsuji, Miki AU - Tsuji M AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Niisato, Yusuke AU - Niisato Y AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Hirose, Suguru AU - Hirose S AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Yamamoto, Yoshiyuki AU - Yamamoto Y AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Moriwaki, Toshikazu AU - Moriwaki T AD - Department of Gastroenterology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575 Japan. GRID: grid.20515.33. ISNI: 0000 0001 2369 4728 FAU - Hyodo, Ichinosuke AU - Hyodo I AD - Department of Gastrointestinal Medical Oncology, National Hospital Organization Shikoku Cancer Center, Matsuyama, Ehime Japan. GRID: grid.415740.3. ISNI: 0000 0004 0618 8403 LA - eng PT - Journal Article DEP - 20230512 PL - Singapore TA - Int Cancer Conf J JT - International cancer conference journal JID - 101734231 PMC - PMC10421835 OTO - NOTNLM OT - Gastric neuroendocrine carcinoma OT - Nivolumab OT - Oligometastasis OT - Radiotherapy COIS- Conflict of interestI.H. serves as a consultant to Asahi Kasei, Ono, Chugai, Taiho, and Eisai pharmaceutical companies. The other authors declare that they have no conflict of interest. EDAT- 2023/08/14 06:43 MHDA- 2023/08/14 06:44 PMCR- 2024/05/12 CRDT- 2023/08/14 04:57 PHST- 2023/01/24 00:00 [received] PHST- 2023/04/24 00:00 [accepted] PHST- 2024/05/12 00:00 [pmc-release] PHST- 2023/08/14 06:44 [medline] PHST- 2023/08/14 06:43 [pubmed] PHST- 2023/08/14 04:57 [entrez] AID - 611 [pii] AID - 10.1007/s13691-023-00611-z [doi] PST - epublish SO - Int Cancer Conf J. 2023 May 12;12(4):268-273. doi: 10.1007/s13691-023-00611-z. eCollection 2023 Oct.