The hMLH1 −93G>A Promoter Polymorphism is Associates with Outcomes in Oral Squamous Cell Carcinoma Patients
- 199 Downloads
The aim of this study was to investigate the impact of hMLH1 polymorphisms on treatment outcomes in patients with oral squamous cell carcinoma (OSCC).
Genotypings were performed by direct DNA sequencing in peripheral blood leukocytes from 185 male OSCC patients. Patients received primary surgery with or without adjuvant radiotherapy. Two hMLH1 tag single nucleotide polymorphisms (SNPs)—rs1800734 (−93G>A in the promoter) and rs1540354 (in the third intron)—were chosen from the HapMap project. Overall survival (OS) and disease-free survival (DFS) were compared between different genotypes.
The hMLH1 rs1800734 and rs1540354 polymorphisms were in weak linkage disequilibrium (r2 = 0.456). OSCC patients with the rs1800734 AA genotype had a significantly poor prognosis in both OS and DFS. This SNP can also predict the outcomes of OSCC patients with postoperative adjuvant radiotherapy, especially in advanced stage; however, no significant differences in patient outcomes were found for the hMLH1 rs1540354 genotypes.
Our results demonstrate that the hMLH1 −93G>A SNP is found to be associated with patient outcomes in OSCC. This SNP can also predict their treatment outcome of radiotherapy.
This study was supported by grants from the National Science Council NSC 99-2314-B-010-044-MY3, Aim for Top University plan from the Department of Education, Taiwan, and Department of Health, Taipei City Government 96001-62-015.
Conflict of interest
- 2.Department of Health, Executive Yuan, Taiwan, ROC. Cancer registry annual report in Taiwan area. Department of Health; 2012.Google Scholar
- 22.Edge SB, American joint committee on cancer. AJCC cancer staging manual. 7th ed. New York: Springer; 2010.Google Scholar