From a group of DNA samples collected at baseline in a prospective cohort of 14 916 initially healthy American men, we assessed 16 TRPM7 tag-single-nucleotide polymorphisms (SNPs) (dbSNP: rs11854949, rs4775899, rs11635825, rs12905120, rs16973487, rs7173321, rs7163283, rs17520378, rs17520350, rs4775892, rs7174839, rs17645523, rs3109894, rs616256, rs11070795, and rs313158) from 245 white men who subsequently had an incident ischemic stroke and from 245 age- and smoking habit-matched white men who remained free of reported vascular disease during follow-up (controls).