ArticleSurgical case reports2024
Clinical complete response after trastuzumab deruxtecan 6th-line treatment for postoperative gastric cancer recurrence: a case report.
Article in Surgical case reports, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundDespite the recent developments in the treatment of advanced or recurrent gastric cancer, the median survival time remains shorter than 15 months. Herein, we report a case of postoperative gastric cancer recurrence in which a complete clinical response was achieved with trastuzumab deruxtecan as 6th-line treatment. CASE PRESENTATION: A 70-year-old man underwent abdominal contrast-enhanced computed tomography (CT) during follow-up after rectal cancer surgery. The CT revealed an enlarged perigastric lymph node. After further examination, the patient's condition was diagnosed as gastric cancer cT2N1H0P0M0 cStage IIA. The patient underwent distal gastrectomy and D2 lymph node dissection. The resulting pathological diagnosis was pT1bN3aH0P0 pStageIIB, HER2 score 3+. Abdominal contrast-enhanced CT 19 months postoperatively revealed para-aortic lymph node recurrence, thus systemic chemotherapy courses were planned. The primary treatment was a combination of S-1, cisplatin, and trastuzumab administered in 11 courses. However, there was an enlargement of the para-aortic lymph node which was evaluated as progressive disease. Systematic chemotherapy with various regimens was continued until the 5th-line treatment. However, therapeutic benefits were not achieved and lung metastasis was observed. Trastuzumab deruxtecan (TDXD) was initiated as 6th-line treatment. Abdominal contrast-enhanced CT at 4 months after the start of treatment showed marked shrinkage of the enlarged para-aortic lymph node and disappearance of the lung metastasis in the right upper lung lobe, which was evaluated as partial response (PR). The para-aortic lymph node metastasis was evaluated as PR with only a slight accumulation of SUV-Max 2.66 with a shrinking trend by positron emission tomography-computed tomography (PET-CT) performed after 1 year. Tumor markers CEA, CA19-9, and CA125 also improved significantly. PET-CT after 1 year and 4 months showed no lymph node enlargement or accumulation, indicating a complete response (CR). All tumor markers also normalized. The patient has maintained clinical CR without additional treatment to date.
conclusionsWe report the apparent first case of postoperative gastric cancer recurrence successfully treated with TDXD, achieving clinical CR with TDXD as a 6th-line treatment.
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