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Overall association between TNF-α-308G>A polymorphism and the overall survival of cancer patients (genotype AA/GA+GG). The hazard ratios (HRs) in the studies and the corresponding 95% confidence intervals (CIs) are plotted with horizontal lines. Pooled HR and the corresponding 95% CI values are denoted by the diamond symbol. TNF-α = tumor necrosis factor-alpha.
