Mismatch Repair Gene Expression as a Predictor of Tumor Responses in Patients With Rectal Cancer Treated With Preoperative Chemoradiation

Medicine
Jung Wook HuhHo-Kyung Chun

Abstract

This study evaluated the predictive and prognostic value of expression of mismatch repair (MMR) protein, including MLH1, MSH2, and MSH6 in rectal cancer patients with preoperative chemoradiotherapy.MMR protein expression was measured by immunohistochemistry in both pretreatment biopsies (pre-) and pathologic specimens (post-) from 209 patients with locally advanced rectal cancer who underwent preoperative chemoradiotherapy and radical surgery. The patients were followed for a median period of 44 months.A pathologic complete response (pCR) was observed in 30 patients (14.4%). The expression levels of MLH1, MSH2, and MSH6 were not significantly different between the pCR and non-pCR groups. A multivariate analysis revealed that tumor differentiation, postoperative chemotherapy, and pre-MSH6 expression were independent predictors of overall survival; ypN category and perineural invasion were independent predictors of disease-free survival. The pre-MSH6 expression was significantly associated with tumor budding and expression of all MMR proteins. On multivariate analysis, ypN category and post-MSH6 expression were independent predictors for local recurrence.In our study, we observed the independent prognostic value of MSH6 expressio...Continue Reading

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Citations

Nov 10, 2018·Technology in Cancer Research & Treatment·Jiang-Tao HouXin-Lin Chen
Aug 14, 2019·International Journal of Radiation Oncology, Biology, Physics·Nicolas MeillanFlorence Huguet

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Methods Mentioned

BETA
biopsies
biopsy

Software Mentioned

SPSS

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