Analysis of information sources in references of the Wikipedia article "Breast cancer" in English language version.
All levels of evidence showed a risk relationship between alcohol consumption and the risk of breast cancer, even at low levels of consumption.
In contrast, abortion is associated with increased risk of carcinomas of the breast. The explanation for these epidemiologic findings is not known, but the parallelism between the DMBA-induced rat mammary carcinoma model and the human situation is striking. ... Abortion would interrupt this process, leaving in the gland undifferentiated structures like those observed in the rat mammary gland, which could render the gland again susceptible to carcinogenesis.
All levels of evidence showed a risk relationship between alcohol consumption and the risk of breast cancer, even at low levels of consumption.
In contrast, abortion is associated with increased risk of carcinomas of the breast. The explanation for these epidemiologic findings is not known, but the parallelism between the DMBA-induced rat mammary carcinoma model and the human situation is striking. ... Abortion would interrupt this process, leaving in the gland undifferentiated structures like those observed in the rat mammary gland, which could render the gland again susceptible to carcinogenesis.