IGF-I (CA) repeat polymorphisms and risk of cancer: a meta-analysis

Journal of Human Genetics
Xin ChenQihan Wu

Abstract

Insulin-like growth factor-I modulates cell growth and survival, and is thought to be important in tumor development. A (CA)19 repeat polymorphism in the promoter region of IGF-I gene that may affect transcription activity has been implicated as a risk factor for cancer, but individual studies have been inconclusive or controversial. Therefore, we performed a meta-analysis of 17 studies with IGF-I (CA)19 repeat genotyping on 8,799 patients and 13,901 controls. There were seven studies with prostate cancer (2,307 cases; 2,622 controls), seven studies with breast cancer (3,533 cases; 7,771 controls), and three studies with colorectal cancer (2,959 cases; 3,508 controls). Overall, the random effects odds ratio (OR) for the (CA)19 versus non-(CA)19 allele was 1.03 [95% confidence interval (CI), 0.95-1.11], with some between-study heterogeneity (P < 0.0001). There was no suggestion of an overall effect either in recessive or dominant modeling of (CA)19 allele effects, and the comparison of (CA)19 homozygosity versus non-(CA)19 homozygosity also showed no differential susceptibility to cancer (OR, 0.99; 95% CI, 0.84-1.16). No effect of (CA)19 was seen in subjects of breast cancer (seven comparisons, OR = 1.03; 95% CI, 0.90-1.17, P = ...Continue Reading

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