Age is the most important risk factor for breast cancer, along with late age at first birth, a small number of children, high alcohol consumption, and sedentary lifestyle, which are getting common in India. A new study from Finland further added the use of hormonal contraceptives and hair dyes to the spectrum of breast cancer risk factors. The analysis included self-reported survey data from 8,000 breast cancer patients and 20,000 controls from Finland. Study design Self-reported survey data was used as a source of exposure information in all sub-studies.
Information on the outcomes of interest, namely breast cancer diagnosis and breast cancer-specific deaths were retrieved from the Finnish Cancer Registry. In Studies I and II, analyzed by conditional logistic regression were conducted to estimate odds ratios (OR) and 95% confidence intervals (CI). In Study III, percentages of women…
