As for resection for colorectal liver metastasis (CRLM), secur-ing an adequate surgical margin is important for achieving a better prognosis. However, it is often difficult to achieve ade-quate margins for the resecti...As for resection for colorectal liver metastasis (CRLM), secur-ing an adequate surgical margin is important for achieving a better prognosis. However, it is often difficult to achieve ade-quate margins for the resection of CRLM. So the current sur-vival impact of sub-centi/millimeter surgical margins in he-patectomy for CRLM should be evaluated. In the current era of multidisciplinary treatment options, this review focused on the prognostic impact of a sub-centi/millimeter surgical margin width in hepatectomy for CRLM. We systematically reviewed retrospective studies that clearly described the sur-gical margin width for hepatectomy for CRLM. We selected studies conducted since 2000 that involved patients diag-nosed as having CRLM. We focused on studies that investi-gated not only surgical margins, but also microscopic surgical curability such as R0 (microscopically complete resection) or R1 (microscopically incomplete resection), which clearly de-scribe their definitions. Based on our literature review, 1, 2, or 5 mm was considered the minimum surgical margin width for hepatectomy for CRLM. Although a surgical margin width of 1 mm is acceptable for hepatectomy for CRLM, submil-limeter margins, which are defined as R1 in many reports, are only acceptable for limited patients such as those who have undergone preoperative chemotherapy. Zero-mm mar-gins are also acceptable in limited patients such as those who show a good response to preoperative chemotherapy. New chemotherapy agents have been reported to reduce the prognostic impact of a narrow surgical margin width. The incidence of margin recurrence, which is a major concern regarding R1 resection of CRLM, is about 20-30% according to the majority of earlier reports. As evaluations of the actual prognostic impact of the surgical margin remain difficult, fur-ther study is warranted.展开更多
文摘As for resection for colorectal liver metastasis (CRLM), secur-ing an adequate surgical margin is important for achieving a better prognosis. However, it is often difficult to achieve ade-quate margins for the resection of CRLM. So the current sur-vival impact of sub-centi/millimeter surgical margins in he-patectomy for CRLM should be evaluated. In the current era of multidisciplinary treatment options, this review focused on the prognostic impact of a sub-centi/millimeter surgical margin width in hepatectomy for CRLM. We systematically reviewed retrospective studies that clearly described the sur-gical margin width for hepatectomy for CRLM. We selected studies conducted since 2000 that involved patients diag-nosed as having CRLM. We focused on studies that investi-gated not only surgical margins, but also microscopic surgical curability such as R0 (microscopically complete resection) or R1 (microscopically incomplete resection), which clearly de-scribe their definitions. Based on our literature review, 1, 2, or 5 mm was considered the minimum surgical margin width for hepatectomy for CRLM. Although a surgical margin width of 1 mm is acceptable for hepatectomy for CRLM, submil-limeter margins, which are defined as R1 in many reports, are only acceptable for limited patients such as those who have undergone preoperative chemotherapy. Zero-mm mar-gins are also acceptable in limited patients such as those who show a good response to preoperative chemotherapy. New chemotherapy agents have been reported to reduce the prognostic impact of a narrow surgical margin width. The incidence of margin recurrence, which is a major concern regarding R1 resection of CRLM, is about 20-30% according to the majority of earlier reports. As evaluations of the actual prognostic impact of the surgical margin remain difficult, fur-ther study is warranted.
