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Erschienen in: Tumor Biology 12/2015

01.12.2015 | Research Article

Association between mismatch repair gene and irinotecan-based chemotherapy in metastatic colon cancer

verfasst von: Junli Ma, Yan Zhang, Hong Shen, Linda Kapesa, Wenqiang Liu, Mengsi Zeng, Shan Zeng

Erschienen in: Tumor Biology | Ausgabe 12/2015

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Abstract

Mismatch repair (MMR) gene is closely related to the pathogenesis of colon cancer. This study aimed to evaluate the association between MMR status and efficacy of irinotecan-based chemotherapy. As a target of 5-FU, thymidylate synthase (TS) expression level might be influenced by irinotecan. Understanding whether this influence of TS is related with MMR status is helpful to the further exploration of the mechanism of irinotecan sensitivity in metastatic colon cancer with different MMR status. One hundred eighty-four patients with metastatic colon cancer receiving irinotecan-based chemotherapy for the first-line treatment were included. Correlations between MMR and clinicopathological characteristics and prognosis were determined. Two pairs of colon cancer cell lines (HCT-116-hMLH1Vector (deficient MMR, dMMR) versus HCT-116-hMLH1+ (proficient MMR, pMMR); SW480-shRNA-hMLH1 (dMMR) versus SW480-shRNA-Control (pMMR)) were established by regulating MMR status. Sensitivity of these cell lines to irinotecan was determined by MTT assay. Regulation of TS by irinotecan was evaluated by western blotting and quantitative real-time PCR assay. dMMR accounted for 18.5 % and was related with proximal colon cancer (p = 0.005), poorly differentiated tumors (p = 0.018) and favorable efficacy with a higher disease control rate (DCR), a longer progression-free survival (PFS) and a trend of longer overall survival (OS). dMMR colon cancer cells were more sensitive to irinotecan. TS expression level was reduced more in dMMR cells after irinotecan treatment (p < 0.05). Our study favors an increased sensitivity of irinotecan in colon cancer with dMMR status. MMR status may be a predictive biomarker of response to irinotecan-based chemotherapy in metastatic colon cancer.
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Metadaten
Titel
Association between mismatch repair gene and irinotecan-based chemotherapy in metastatic colon cancer
verfasst von
Junli Ma
Yan Zhang
Hong Shen
Linda Kapesa
Wenqiang Liu
Mengsi Zeng
Shan Zeng
Publikationsdatum
01.12.2015
Verlag
Springer Netherlands
Erschienen in
Tumor Biology / Ausgabe 12/2015
Print ISSN: 1010-4283
Elektronische ISSN: 1423-0380
DOI
https://doi.org/10.1007/s13277-015-3723-5

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