The infiltrative duct carcinoma (IDC) is the most common malignant breast cancer in females and genetic factors appear to play a significant role in the susceptibility of IDC. The LFA-1 is a crucial co-stimulatory molecule in immune system and may affect the development of breast IDC. In order to clarify the association of LFA-1 polymorphisms with IDC, a case-control study was conducted in women from Heilongjiang Province, Northeast of China. We scrutinized four genetic polymorphisms in LFA-1 gene, which may influence the activity and function of LFA-1. Our research subjects consist of 537 cases with IDC and 577 age-matched healthy controls. Genotypes were determined by PCR-RFLP. Data were analyzed using the χ(2) test by SPSS 13.0 and Haploview 4.1 softwares. The association between LFA-1 polymorphisms and the clinical features of IDC was analyzed. In rs2230433, the frequency of GG genotype and G allele was lower in cases than in controls (P = 0.0316 and 0.0480). And rs2230433, CG genotype was higher in cases (P = 0.0397). In rs8058823, the frequency of AA genotype and A allele was lower in cases than in controls (P = 0.00000418 and 0.00000267). And rs8058823, AG genotype was higher in cases (P = 0.00000747). The frequency of haplotype CCGA was lower in patients. Significant association was shown between the four SNPs of LFA-1 gene and estrogen receptor (ER), progesterone receptor (PR), C-erbB-2, and P53 statuses. In addition, no association was found between LFA-1 gene polymorphisms and tumor size, and neither was it between LFA-1 gene polymorphisms and lymph node metastasis. Our results primarily suggested that LFA-1 gene polymorphisms may predict the sporadic breast IDC risk and prognosis factors in Chinese Han women in Heilongjiang Province.