식도암으로 인한 식도절제술 후 둘레절제가장자리 병발의 유의성
Significance of Circumferential Resection Margin Involvement Following Esophagectomy for Esophageal Cancer
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Abstract
Background : This study was performed to examine the significance of the circumferential resection margin (CRM) involvement by a tumor on the postoperative survival after esophageal cancer surgery. Methods : Fifty nine resected cases of esophageal cancers were retrospectively reviewed. The presence of a tumor either at, or within 1 mm of, the CRM was recorded. By an immunohistochemical study for Ki-67, the Ki-67 differential grades (Ki-67 DG) were defined according to the differences between the Ki-67 labeling indices of the central and of peripheral areas of the tumor nearest to the CRM: Ki-67 DG 0 (≤10%) and Ki-67 DG 1 (>10%). The CRM involvement was correlated with the clinicopathological factors, Ki-67 DG and survival data. Results : CRM involvement was found in 26 (44.1%) of the 59 cases. There were significant differences in the cases, both with and without CRM involvement of tumor cells, in relation to lymph node metastasis, lymphovascular, perineural invasions and tumor stage (p<0.05). Ten (38.3%) of the 26 with, and 3 (9.1%) of 33 cases without, CRM involvement, showed Ki-67 DG 1 (p=0.007). The 3-year survivals of patients with and without CRM involvement were 26.8 and 61.8%, respectively (p=0.003). Conclusions : These results show that the CRM involvement status may be used as a predictor of survival after esophageal cancer surgery, and CRM involvement is more an indicator of an advanced disease than of an incomplete resection.
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