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CD28(TT) and IFNG(AA) polymorphisms are associated with cervical cancer only when both polymorphisms are present. (A), proportion of CD28(TT) in cases and controls in the presence or absence of IFNG(AA). (B), proportion of IFNG(AA) in cases and controls in the presence or absence of CD28(TT). The X-axis represents the odds ratio (OR) scale.
