Cytotoxic T lymphocyte antigen-4 gene in breast cancer

Breast Cancer Research and Treatment
Abbas GhaderiAlamtaj Samsami Dehaghani

Abstract

The exon 1 polymorphism (49A/G) of ctla-4 gene corresponds to an amino acid exchange (threonine to alanine) in the leader peptide of the expressed protein. There are reports concerning the higher level of G allele in subjects with various autoimmune diseases, which has resulted in the hypothesis that CTLA-4 may play a role in regulating self-tolerance by the immune system and in the pathogenesis of autoimmune disorders. This study was undertaken to investigate the correlation of exon 1 (49A/G) polymorphism in the ctla-4 gene and breast cancer. The ctla-4 49A/G polymorphism was studied in 197 women with primary breast cancer and 151 age/sex matched normal individuals. The results indicated a significant difference between frequency of ctla-4 genotypes in patients and controls. The frequency of GG genotype was significantly decreased in breast cancer patients compared to controls (4.6% v.s. 12.6%, P = 0.012). There was also a significant positive correlation between tumor size and the existence of AA genotype in patients (P = 0.016). In addition, a positive correlation between AA genotype and lymph node involvement was observed (P = 0.042). The observed decrease in the frequency of GG genotype in the breast cancer patients is con...Continue Reading

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