Association of 12 polymorphic variants conferring genetic risk to lung cancer in Indian population: An extensive meta ‐analysis

Candidate gene as well as genome‐wide association studies identified several polymorphic variants to be associated with lung cancer worldwide including in India. However, contradictory results have failed to estimate the overall effect of the polymorphic variants on the disease. Textmining was conducted on PubMed following specific search strings to gather all the publications related to genetic association with lung cancer in India. Out of 211 PubMed hits only 30 studies were selected for meta‐analysis following specific inclusion criteria. Heterogeneity between studies was calculated by Cochran's Q‐test (P < 0.05) and heterogeneity index (I2). Publication bias was visualized by funnel plots and Egger's regression test. For each variant, following a fixed‐effect model, summary odds ratio (OR) along with 95% confidence interval (CI) was estimated. The meta‐analysis revealed three polymorphic variants viz. ‘deletion polymorphism (del1) (OR = 1.39, 95% CI = 1.03–1.87, P = 0.027) in GSTT1’, ‘deletion polymorphism (del2) (OR = 1.30, 95% CI = 1.01–1.67, P = 0.038) in GSTM1’ and ‘rs1048943 (OR = 1.98, 95% CI = 1.27–3.10, P = 0.002) in CYP1A1’ to be associated with lung cancer. However, after multiple testing correction, only rs1048943 was found to be significantly associated (P value = 0.0321) with lung cancer. None of the polymorphic variants showed any evidence of heterogeneity between studies or of public...
Source: Environmental and Molecular Mutagenesis - Category: Molecular Biology Authors: Tags: Research Article Source Type: research