Breast Cancer

, Volume 25, Issue 2, pp 176–184 | Cite as

Passive smoking, NAT2 polymorphism, and breast cancer risk in Israeli Arab women: a case–control study

  • Z. Regev-Avraham
  • O. Baron-Epel
  • S. K. Hammond
  • L. Keinan-Boker
Original Article

Abstract

Background

The effect of passive smoking (PS) on breast cancer (BC) is controversial, and may be modified by polymorphism of the N-Acetyl-transferase (NAT) 2 enzyme which is involved in tobacco carcinogen metabolism. We aimed to evaluate the relationship between PS and BC by NAT2 variants in Arab–Israeli women, a unique population with low active smoking rates, and high exposure to PS.

Methods

A population-based case-control study was carried out on non-smoking 137 prevalent breast cancer patients and 274 population-based controls, aged 30–70 years. Data on past and current PS, sociodemographic, and other characteristics were retrieved through interviews, and buccal smears were provided for NAT2 analyses. Logistic regression models adjusting for potential confounders assessed the odds ratios (ORs) and 95% confidence intervals (95% CI) of the association between PS and BC.

Results

Ever PS was associated with increased BC risk: OR = 2.22, 95% CI 1.28–3.87. Higher lifetime PS exposure was associated with higher BC risk: Compared to never exposed women, women exposed to PS most of their lives had a threefold higher BC risk (OR = 3.16, 95% CI 1.70–5.87, P trend < 0.001). NAT2 polymorphism did not modify these associations.

Conclusions

PS exposure in non-smoking Israeli Arab women is significantly associated with increased risk for BC, potentially allowing for specific intervention; NAT2 polymorphism does not modify this association.

Keywords

Arab Breast cancer Case–control NAT2 Passive smoking 

Notes

Acknowledgements

The authors of this study acknowledge and thank the Israeli Arabic women of northern Israel who participated in this study. We would also like to thank Prof Zidan of Ziv Medical Center in Zefat and Dr. Hadassah Goldberg of West Galilee Medical Center in Nahariya for their cooperation and help in conducting the study.The study was conducted as partial fulfillment of the requirements for a Ph.D. degree of Z. Regev-Avraham at the University of Haifa.

Compliance with ethical standards

Conflict of interest

The authors declare no conflicts of interest.

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Copyright information

© The Japanese Breast Cancer Society 2017

Authors and Affiliations

  1. 1.School of Public Health, Faculty of Social Welfare and Health SciencesUniversity of HaifaHaifaIsrael
  2. 2.School of Public Health, Environmental Health Sciences DivisionUniversity of CaliforniaBerkeleyUSA
  3. 3.Israel Center for Disease Control, Israel Ministry of Health, Gertner InstituteSheba Medical CenterRamat GanIsrael

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