[No authors listed]
Genes OGG1 and MUTYH are the two primary genes in Base excision repair pathway. OGG1 hydrolyzes the sugar phosphate backbone and remove the damaged base creating abasic site. MUTYH complements OGG1 as it particularly remove adenine mispaired with 8-oxo-G. Both OGG1 and MUTYH act as a check for the mis-incorporation of bases may be due to damages incurred on DNA. DNA isolation for 326 lung cancer cases and 330 controls was followed by genotyping making use of PCR-RFLP. Logistic regression was done to analyze the risk towards lung cancer. Patients were followed through telephonic conversation. Kaplan meier and Cox-regression were used for survival analysis. OGG1 presented a high risk towards lung cancer (CG: ORâ=â2.44, pâ=â0.0003; CGâ+âGG: ORâ=â1.88, pâ=â0.0093). On the same lines adenocarcinoma for OGG1 were potent risk factors towards lung cancer (CG: ORâ=â4.72, pâ=â0.0002; CGâ+âGG: ORâ=â3.63, pâ=â0.0018). Single allelic carriers for MUTYH gene imposed a high risk towards overall lung susceptibility and for all the three histology. Stratified analysis for chemotherapeutic drugs revealed administration of Cisplatin/Carboplatinâ+âPemtrexed for OGG1Ser 326 Cys showed a better survival (MST CG vs. CC: 9.1 vs. 0.56, pâ=â<0.0001; HR =0.051, pâ=â0.0025). Whereas, MUTYH Gln324His showed a smaller survival for mutant genotype (CC) (MST CC vs. GG: 4.0 vs. 9.4, pâ=â0.05; HRâ=â1.75, pâ=â0.26). Single allelic carriers for both OGG1 and MUTYH were risk factors towards lung cancer. The risk was amplified on combining both OGG1 and MUTYH.
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