We studied clinical data and stromelysingenotype of 51 feasible patients. We found no significant differences of clinical risk factors between the patients with or without restenosis. The allele frequencies of 5A and 6A were 17% and 83% in total study population, 26% and 74% in patient group without restenosis, 6% and 94% in patients with restenosis, respectively. The frequencies of non6A/6A containing 5A allele(5A/5A and 5A/6A) and 6A/6A was 41% and 59% in non-restenotic group and 12.5% and 87.5% in restenotic group. So the relative risk of restenosis for 6A/6A compared to non6A/6A was 4.83(95% CI 1.15~20.17, p=0.03).