Mostafa Dianatinasab1, Mohammad Fararouei2, Mohammad Mohammadianpanah3, Mohammad Zare-Bandamiri4, Abbas Rezaianzadeh5. 1. Department of Epidemiology, Faculty of Public Health, Shiraz University of Medical Sciences, Shiraz, Iran; Shiraz HIV/AIDS Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran. 2. Shiraz HIV/AIDS Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran. Electronic address: fararooei@gmail.com. 3. Colorectal Research Center, Faghihi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran. 4. Department of Epidemiology, Faculty of Public Health, Shiraz University of Medical Sciences, Shiraz, Iran. 5. Department of Epidemiology, Faculty of Public Health, Shiraz University of Medical Sciences, Shiraz, Iran; Colorectal Research Center, Faghihi Hospital, Shiraz University of Medical Sciences, Shiraz, Iran.
Abstract
PURPOSE: Epidemiologic characteristics of breast cancer in Iran are significantly different from those in the West and even other regional countries, but little is known about the related factors. PATIENTS AND METHODS: A hospital-based case-control study was conducted on 1052 women (526 new cases and 526 controls). Logistic regression was performed to investigate associations of study factors with breast cancer risk. RESULTS: This study introduced occupation (odds ratio [OR]employed/household, 1.77; 95% confidence interval [CI], 1.15-2.69), marital age (OR24-30 y/< 18 y, 2.13; 95% CI, 1.03-4.40), age at first delivery (OR≥ 30 y/< 18 y, 3.53; 95% CI, 1.73-7.18), parity (OR1-2/Nulliparous or never married, 2.61; 95% CI, 1.13-6.02), birth interval (OR30-50 mos/< 18 mos, 2.38; 95% CI, 1.45-3.89), lifetime breastfeeding (OR≥ 42 mos/< 6 mos, 0.37; 95% CI, 0.18-0.77), and menarche age (year) (OR, 0.87; 95% CI, 0.79-0.96) as significant associates of breast cancer. In addition, body mass index (OR, 1.07; 95% CI, 1.02-1.11) and some health-related behaviors including hair coloring on a regular basis (ORyes/no, 1.93; 95% CI, 1.41-2.62), smoking (ORyes/no, 2.02; 95% CI, 1.22-3.34), oral contraceptive usage (ORever/never. 1.46; 95% CI, 1.05-2.04), physical inactivity (ORinactive/regular activity, 1.54; 95% CI, 1.39-1.75), past life stress (ORoften stressful/often calm, 2.40; 95% CI, 1.62-3.56), and regular bedtime (ORoften regular/no, 0.32; 95% CI, 0.19-0.54) were related to a higher risk of breast cancer. CONCLUSION: This study revealed a significant number of factors that seem to contribute to the risk of breast cancer even more than the other previously introduced factors.
PURPOSE: Epidemiologic characteristics of breast cancer in Iran are significantly different from those in the West and even other regional countries, but little is known about the related factors. PATIENTS AND METHODS: A hospital-based case-control study was conducted on 1052 women (526 new cases and 526 controls). Logistic regression was performed to investigate associations of study factors with breast cancer risk. RESULTS: This study introduced occupation (odds ratio [OR]employed/household, 1.77; 95% confidence interval [CI], 1.15-2.69), marital age (OR24-30 y/< 18 y, 2.13; 95% CI, 1.03-4.40), age at first delivery (OR≥ 30 y/< 18 y, 3.53; 95% CI, 1.73-7.18), parity (OR1-2/Nulliparous or never married, 2.61; 95% CI, 1.13-6.02), birth interval (OR30-50 mos/< 18 mos, 2.38; 95% CI, 1.45-3.89), lifetime breastfeeding (OR≥ 42 mos/< 6 mos, 0.37; 95% CI, 0.18-0.77), and menarche age (year) (OR, 0.87; 95% CI, 0.79-0.96) as significant associates of breast cancer. In addition, body mass index (OR, 1.07; 95% CI, 1.02-1.11) and some health-related behaviors including hair coloring on a regular basis (ORyes/no, 1.93; 95% CI, 1.41-2.62), smoking (ORyes/no, 2.02; 95% CI, 1.22-3.34), oral contraceptive usage (ORever/never. 1.46; 95% CI, 1.05-2.04), physical inactivity (ORinactive/regular activity, 1.54; 95% CI, 1.39-1.75), past life stress (ORoften stressful/often calm, 2.40; 95% CI, 1.62-3.56), and regular bedtime (ORoften regular/no, 0.32; 95% CI, 0.19-0.54) were related to a higher risk of breast cancer. CONCLUSION: This study revealed a significant number of factors that seem to contribute to the risk of breast cancer even more than the other previously introduced factors.
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