Epidemiology of Breast Cancer and Risk Factors


Breast cancer incidence rates increase sharply with age, becoming substantial before the age of 50 years. Major risk factors that occur are during the premenopausal years, the rate of increase in incidence is common around the world, approximately 8%-9% per year, breastfeeding each child for less than 6 months, and physical inactivity, are each linked to an estimated 3% of female breast cancer cases. Some other factors include oral contraceptives; hormone replacement therapy, ionizing radiation, and diethylstilboestrol use in pregnancy are causes of breast cancer and lifestyle factors including overweight and obesity, alcohol and certain occupational exposures. Breast cancer, like other forms of cancer, can result from multiple environmental and hereditary risk factors like individual person's development, exposure to microbes, medical interventions, and dietary exposures to nutrients, energy and toxicants, chemicals from industrial, agricultural processes and from consumer products.


  • Lifestyle factors
  • Occupational exposures

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