Abstract
Association between restriction fragment length polymorphisms (RFLP) of known oncogenes and a predisposition to develop cancer have been postulated. The L-myc gene is a potential molecular marker associated with cancer susceptibility as well as metastasis, prognosis, and adverse survival. Our aim was to test the hypothesis that there was an association between L-myc S allele in breast cancer and a predisposition to the disease. The distribution of L-myc polymorphism in 56 patients with breast cancer was determined by polymerase chain reaction-based restriction fragment length polymorphism and compared with that of 51 healthy control subjects. The allele frequencies of L and S in breast cancer patients were 0.70 and 0.30, respectively and those in normal individuals were 0.54 and 0.46, respectively. This difference was primarily the result of a high frequency of the S allele among breast cancer patients compared to controls. The frequency of S allele was significantly higher in breast cancer patients than in normal individuals (p < 0.01). No correlation was observed between the presence of L-myc S allele and several parameters of each patient's history or characteristics of tumor. Our results suggested that L-myc polymorphism may be significant in an individual's susceptibility to breast cancer in Turkey and may be useful for identifying patients at high risk of developing breast cancer.
Highlights
Breast cancer is a genetic disease, with most breast cancer cases resulting from a dysregulation of genetically determined cellular pathways
The polymorphic L-myc gene locus was analysed by Polymerase Chain Reaction (PCR)-restriction fragment length polymorphisms (RFLP) for 56 breast cancer patients and 51 healthy individuals
Bieche et al [1] found that a significantly shorter period after relapse was observed for patients with loss of heterozygosity at L-myc in primary tumor DNAs compared with patients with tumor DNAs lacking this alteration
Summary
Breast cancer is a genetic disease, with most breast cancer cases resulting from a dysregulation of genetically determined cellular pathways. Association between restriction fragment length polymorphism (RFLPs) of known oncogenes and a predisposition to develop cancer have been reported by a number of authors [2,3]. Eco RI restricted human DNAs show fragment length polymorphism of L-myc (chromosome 1p 32) defined by 2 alleles:10.0 kb (L) and 6.6 kb (S) fragments [4]. Association between restriction fragment length polymorphisms (RFLP) of known oncogenes and a predisposition to develop cancer have been postulated. Our aim was to test the hypothesis that there was an association between L-myc S allele in breast cancer and a predisposition to the disease. Materials and Methods: The distribution of L-myc polymorphism in 56 patients with breast cancer was determined by polymerase chain reaction-based restriction fragment length polymorphism and compared with that of 51 healthy control subjects
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