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TP53 Polymorphisms in Sporadic North Indian Breast Cancer Patients

  • Sharma, Sarika (Human Cytogenetics Laboratory, Department of Human Genetics, Guru Nanak Dev University) ;
  • Sambyal, Vasudha (Human Cytogenetics Laboratory, Department of Human Genetics, Guru Nanak Dev University) ;
  • Guleria, Kamlesh (Human Cytogenetics Laboratory, Department of Human Genetics, Guru Nanak Dev University) ;
  • Manjari, Mridu (Department of Pathology, Sri Guru Ram Das Institute of Medical Sciences and Research) ;
  • Sudan, Meena (Department of Radiotherapy, Sri Guru Ram Das Institute of Medical Sciences and Research) ;
  • Uppal, Manjit Singh (Department of Surgery, Sri Guru Ram Das Institute of Medical Sciences and Research) ;
  • Singh, Neeti Rajan (Department of Surgery, Sri Guru Ram Das Institute of Medical Sciences and Research) ;
  • Bansal, Darpan (Department of Surgery, Sri Guru Ram Das Institute of Medical Sciences and Research) ;
  • Gupta, Arun (Department of Surgery, Sri Guru Ram Das Institute of Medical Sciences and Research)
  • Published : 2014.08.30

Abstract

Background: The purpose of this study was to evaluate the potential association of five (p.P47S, p.R72P, PIN3 Ins16bp, p.R213R and r.13494g>a) polymorphisms of TP53 with the risk of developing breast cancer in North Indian Punjabi population. Methods: We screened DNA samples of 200 sporadic breast cancer patients (197 females and 3 males) and 200 unrelated healthy, gender and age matched individuals for the polymorphisms. Results: For the p.P47S polymorphism, we observed the PP genotype in 99.5% of the patients and PS genotype in only 1 patient. All the controls had the wild type PP genotype. The frequency of RR, RP and PP genotype of p.R72P was 23.5% vs 33.5%, 51.5% vs 45.5% and 25% vs 21% in patients and controls respectively. Heterozygous (RP) genotype was increased in breast cancer patients as compared to controls (51.5 vs 45.5%) and showed 1.61 fold significantly increased risk for breast cancer (OR=1.61, 95% CI, 1.01-2.58, p=0.04). In breast cancer patients the frequencies of A1A1, A1A2 and A2A2 genotypes of PIN3 Ins16bp polymorphism were 67%, 26% and 7% respectively whereas in controls the genotype frequencies were 68.5%, 27.5% and 4% respectively, with no significant difference. For p.R213R (c.639A>G), all individuals had homozygous wild type genotype. The frequencies of GG, GA and AA genotypes of TP53 r.13494g>a polymorphism were 62 vs 67.5%, 33 vs 28% and 5 vs 4.5% in patients and controls respectively, again without significant difference. We observed that RP-A1A1 genotype combination of p.R72P and PIN3 Ins16bp and RP-GG combination of p.R72P and r.13494g>a polymorphism showed significant risk of breast cancer (OR=1.65, 95%CI: 0.98-2.78, p=0.05; OR=1.72, 95%CI: 1.01-2.92, p=0.04). Conclusion: The results of present study indicated that among the five TP53 polymorphisms investigated, the p.R72P polymorphism, and the RP-A1A1 and RP-GG genotype combination contribute to breast cancer susceptibility in North Indians.

Keywords

Breast cancer;TP53 polymorphisms;susceptibility;North Indians

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