TIMP2 and breast cancer: Combining with the existing literature reports, and minor allele frequencies (MAFs) of greater than 5% in the global population, we selected rs2277698, rs2009196, rs7342880, rs11654470, rs2003241, and rs4789936 six SNPs to research the effect of TIMP-2 gene polymorphisms on the susceptibility of breast cancer in a cohort of Han Chinese women.