title: MDR1 polymorphisms associated with risk and survival in diffuse large B-cell lymphoma.
abstract: MDR1 encodes an adenosine triphosphate (ATP)-dependent efflux transporter that protects the body from environmental xenobiotics to maintain optimal health. Five single nucleotide polymorphisms (SNPs) of MDR1, T-2410C, T-129C, C1236T, G2677T/A and C3435T, were identified in our previous study. To investigate further the biological significance of these SNPs, we genotyped the SNPs in 135 patients with diffuse large B-cell lymphoma (DLBCL) and 376 age- and sex-matched controls. Statistical analysis indicated that the MDR1-129TC genotype was associated with an increased risk of DLBCL (p = 0.040) compared with the TT genotype, and the increased risk was more pronounced in older patients (> 50 years, p = 0.011). Patients with MDR1 2677TT displayed worse survival rates compared with those carrying MDR1 2677G/A alleles (p = 0.036). Multivariate Cox analysis revealed that the G2677T/A polymorphism was an independent prognostic factor for overall survival (OS). Further, we found a combined effect of MDR1 G2677T/A and C3435T on OS of patients with DLBCL. These results suggest that the MDR1 T-129C, G2677T/A and C3435T polymorphisms are associated with risk of and survival in DLBCL, although the p-values are not as strong after Bonferroni correction. Further investigations with a relatively larger number of patients and longer follow-up periods should be undertaken to confirm our results.
authors.affiliation: Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-Sen University, P. R. China.
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Hu
authors.forename: Bingyun
authors.initials: B
authors.lastname: Yu
authors.forename: Jine
authors.initials: J
authors.lastname: Yang
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics*; D000328:Adult; D000368:Aged; D000483:Alleles; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000175:diagnosis / Q000235:genetics* / Q000401:mortality*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D020641:Polymorphism, Single Nucleotide; D011379:Prognosis
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1