Abstract:
:DNA intrastrand cross-linking agents such as oxaliplatin induce DNA double-strand breaks (DSBs) during DNA repair and replication. In the present study, we hypothesized that DNA intrastrand cross-linking agents may significantly benefit colorectal cancer patients with deficiencies in DSB repair. Seventy-eight patients with metastatic or recurrent colorectal cancer who had measurable target lesions and who underwent resection for primary colorectal cancer in our institution between April 2007 and March 2013 were included in the present study. The median age was 64.5 years, and the cohort consisted of 49 males and 29 females. The median progression-free survival (PFS) was 10.9 months. The expression of DSB repair proteins such as RAD51 and MRE11 was investigated by immunohistochemistry, and associations between RAD51 and MRE11 expression and clinicopathological factors or chemotherapeutic effect were assessed. MRE11-negative cases and RAD51-negative cases achieved significantly better tumor reduction compared with cases with positive expression. Cases with negative expression of both proteins or negative expression of either protein had significantly longer PFS than cases with positive expression for both proteins. In conclusion, DSB repair protein expression-negative colorectal cancer cases may be more highly sensitive to chemotherapy, and thus DSB repair protein expression may be a useful prognostic indicator for colorectal cancer patients.
journal_name
Oncol Repjournal_title
Oncology reportsauthors
Ihara K,Yamaguchi S,Ueno N,Tani Y,Shida Y,Ogata H,Domeki Y,Okamoto K,Nakajima M,Sasaki K,Tsuchioka T,Mitomi H,Kato Hdoi
10.3892/or.2015.4488subject
Has Abstractpub_date
2016-03-01 00:00:00pages
1349-55issue
3eissn
1021-335Xissn
1791-2431journal_volume
35pub_type
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