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이석환 대한대장항문학회 2019 Annals of Coloproctolgy Vol.35 No.1
The current standard of care for treating patients with locally advanced rectal cancer includes preoperative chemoradiation therapy (PCRT) followed by a total mesorectal excision and postoperative adjuvant chemotherapy. A subset of these patients has achieved a pathologic complete response (pCR) and they have shown improved disease-free and overall survival compared to non-pCR patients. Thus, many efforts have been made to achieve a higher pCR through PCRT. In this review, results from various ongoing and recently completed clinical trials that are being or have been conducted with an aim to improve tumor response by modifying therapy will be discussed.
국소 진행된 원위부 직장암에 대한 수술 전 화학방사선치료 후 복회음 절제술 치료성적
김정연,김진수,김영완,허혁,민병소,김남규 대한대장항문학회 2010 Annals of Coloproctolgy Vol.26 No.2
Purpose: An abdominoperineal resection (APR) has a poor prognosis. However, limited studies about the prognostic factors in APR and the role of preoperative chemoradiotherapy (CRT) have been performed even though in rectal cancer, the application of preoperative CRT provides better local control compared to postoperative CRT. The aim of this study was to identify the prognostic factors and the impact of preoperative CRT in patients who undergo an APR. Methods: A retrospective analysis was conducted with a total of 133 patients who underwent an APR, cT3, cT4, or cN(+)patients, for rectal cancer between January 1995 and October 2004. Fifty-one patients treated with preoperative CRT (Group 1) were compared with 82 APR patients treated with postoperative CRT (Group 2). Oncologic outcomes were compared between the two groups, and the clinicopathologic factors affecting the treatment outcomes were evaluated. Results: The median follow-up period was 61.2 mo (range 6 to 194 mo). Circumferential margin (CRM) involvement was significantly associated with local recurrence (LR) and with disease-free survival in APR patients (P<0.001, P=0.011). The 5-yr LR rate was significantly lower in Group 1 than in Group 2 (P=0.013) in the univariate analysis, but no difference was noted in multivariate analysis (P=0.315). In Group 1, CRM involvement, tumor size, and lymph node metastasis were significantly lower than they were in Group 2 (P=0.043, P=0.003, P<0.001). Conclusion: For achieving adequate oncologic outcomes in APR patients, an adequate CRM should be acquired with an optimal operation. In addition, preoperative CRT would be helpful for high-risk APR patients with a threatening CRM margin,providing the benefit of tumor downstaging.