ArticleClinical journal of gastroenterology2020
A case of an enlarged rectal adenoma while achieving a clinical complete response with chemotherapy for advanced rectal cancer.
Article in Clinical journal of gastroenterology, 2020. 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
The effect of chemotherapeutic agents on concomitant colorectal adenomas in patients with advanced colorectal cancer is not clear. We report a case of an enlarged rectal adenoma while achieving a clinical complete response with chemotherapy for an advanced rectal adenocarcinoma. A 78-year-old man was referred to our hospital for evaluation of bloody stools. The clinical diagnosis was an advanced lower rectal adenocarcinoma with para-aortic lymph node metastases, and a sessile polyp on the proximal aspect of the rectal tumor. The rectal adenocarcinoma was treated with chemotherapy, including 1 cycle of capecitabin plus oxaliplatin (CapeOX), 22 cycles of tegafur/gimeracil/oteracil (S-1) plus irinotecan (IRIS), and 1 cycle of tegafur (UFT) plus calcium folinate (LV). One year after the last course of chemotherapy, colonoscopy showed a scar without visible rectal tumor; CT imaging confirmed no para-aortic lymphadenopathy. The patient had a clinical complete response to chemotherapy. In contrast, the polyp increased in size. The polyp was removed by endoscopic mucosal resection (EMR). The pathologic evaluation showed a well-differentiated tubular adenocarcinoma with adenoma localized in the mucosa. No recurrence of the advanced adenocarcinoma or intramucosal adenocarcinoma with adenoma occurred for 2 years after EMR. This case indicates the importance of careful surveillance for synchronous adenomas, even in patients with advanced colorectal cancer.
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