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The Clinicopathological Factors That Determine a Local Recurrence of Rectal Cancers That Have Been Treated with Surgery and Chemoradiotherapy  

Choi, Chul-Won (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Kim, Min-Suk (Departments of Radiation Pathology, Korea Institute of Radiological and Medical Sciences)
Lee, Seung-Sook (Departments of Radiation Pathology, Korea Institute of Radiological and Medical Sciences)
Yoo, Seong-Yul (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Cho, Chul-Koo (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Yang, Kwang-Mo (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Yoo, Hyung-Jun (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Seo, Young-Seok (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Hwang, Dae-Yong (Departments of Radiation Surgery, Korea Institute of Radiological and Medical Sciences)
Moon, Sun-Mi (Departments of Radiation Surgery, Korea Institute of Radiological and Medical Sciences)
Kim, Mi-Sook (Departments of Radiation Oncology, Korea Institute of Radiological and Medical Sciences)
Publication Information
Radiation Oncology Journal / v.24, no.4, 2006 , pp. 255-262 More about this Journal
Abstract
$\underline{Purpose}$: To evaluate the pathological prognostic factors related to local recurrence after radical surgery and adjuvant radiation therapy in advanced rectal cancer. $\underline{Materials\;and\;Methods}$: Fifty-four patients with advanced rectal cancer who were treated with radical surgery followed by adjuvant radiotherapy and chemotherapy between February 1993 and December 2001 were enrolled in this study. Among these patients, 14 patients experienced local recurrence. Tissue specimens of the patients were obtained to determine pathologic parameters such as histological grade, depth of invasion, venous invasion, lymphatic invasion, neural invasion and immunohistopathological analysis for expression of p53, Ki-67, c-erb, ezrin, c-met, phosphorylated S6 kinase, S100A4, and HIF-1 alpha. The correlation of these parameters with the tumor response to radiotherapy was statistically analyzed using the chi-square test, multivariate analysis, and the hierarchical clustering method. $\underline{Results}$: In univariate analysis, the histological tumor grade, venous invasion, invasion depth of the tumor and the over expression of c-met and HIF-1 alpha were accompanied with radioresistance that was found to be statistically significant. In multivariate analysis, venous invasion, invasion depth of tumor and over expression of c-met were also accompanied with radioresistance that was found to be statistically significant. By analysis with hierarchical clustering, the invasion depth of the tumor, and the over expression of c-met and HIF-1 alpha were factors found to be related to local recurrence. Whereas 71.4% of patients with local recurrence had 2 or more these factors, only 27.5% of patients without local recurrence had 2 or more of these factors. $\underline{Conclusion}$: In advanced rectal cancer patients treated by radical surgery and adjuvant chemo-radiation therapy, the poor prognostic factors found to be related to local recurrence were HIF-1 alpha positive, c-met positive, and an invasion depth more than 5.5 mm. A prospective study is necessary to confirm whether these factors would be useful clinical parameters to measure and predict a radio-resistance group of patients.
Keywords
Rectal cancer; Local recurrence; Prognostic factor; Immunohistochemical analysis;
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