4 ms·

The title is misleading. It should be: Any type of hormonal contraceptive is associated with an increased risk of breast cancer.

• LorenPechtel 4y ago
  Yeah--there's a factor here that messes up the data. Namely, that pregnancy to term is associated with a *reduction* in breast cancer, the earlier the pregnancy the bigger the effect. This is the reason behind the "pro-life" claim that abortion causes breast cancer--no, it simply doesn't provide the protection. Never-pregnant vs had-abortion is the same risk. Hormonal contraception is more effective and will reduce the oops rate and thus would be expected to show a positive correlation with breast cancer. (And the oops rate is also why for a young non-smoker the risk of the pill is *negative* even if the response to an oops is an immediate abortion. Carrying it to term increases the effect by at least an order of magnitude.)
  • yamrzou 4y ago
    I think that factor is taken into account here: > These calculations were then adjusted to take into account established risk factors such as body mass index (BMI), number of recorded births, and the time since a woman’s last birth. Is it the same as yours?
    • LorenPechtel 4y ago
      The age of *first* birth matters, not the age of last birth. They controlled on the wrong thing.