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Background  Caspases are important regulators and executioners in apoptosis pathway and have been defined as either tumor suppressors or oncogenes. Polymorphisms in promoter and exon of  caspase 9  were shown to confer genetic susceptibility to multiple cancers, but the results were inconsistent. To accomplish a more precise estimation of the relationship, a meta-analysis was performed.    Methodology/Principal Findings  We assessed published studies of the association between  caspase 9  polymorphisms and cancer risk from nine studies with 5,528 subjects for rs4645978, six studies with 2,403 subjects for rs105276 and two studies for rs4645981. Overall meta-analysis indicated that no evidence of an association between rs4645978 and cancers was found. Through the stratified analysis, statistically significant reduced cancer risks were observed among Caucasians (AG  vs  AA: OR = 0.81, 95% CI = 0.66–0.99,  P   heterogeneity  = 0.150 and the dominant model: OR = 0.86, 95% CI = 0.75–0.99,  P   heterogeneity  = 0.290) and prostate cancer. As for rs105276, Ex5+32G>A polymorphism was found with protective effect in overall meta-analysis (AA  vs  GG: OR = 0.75, 95% CI = 0.60–0.92,  P   heterogeneity  = 0.887; A  vs  G: OR = 0.85, 95% CI = 0.77–0.95,  P   heterogeneity  = 0.739 and the recessive model: OR = 0.68, 95% CI = 0.56–0.82,  P   heterogeneity  = 0.309) and Asians group. While for rs4645981, a statistically significant increase in risk of lung cancer was shown in Asians (T  vs  C: OR = 1.23, 95% CI = 1.07–1.42,  P   heterogeneity  = 0.399 and the dominant model: OR = 1.22, 95% CI = 1.04–1.43,  P   heterogeneity  = 0.660).    Conclusions/Significance  Our meta-analysis suggests that the  caspase 9  rs4645978 most likely contributes to decreased susceptibility to cancer in Caucasians and prostate cancer. The A allele of rs105276 might be a protective factor for cancer, especially for Asians. However, it seems that rs4645981 confers increased susceptibility to lung cancer in Asians.

A Meta-Analysis of Caspase 9 Polymorphisms in Promoter and Exon Sequence on Cancer Susceptibility