"It appears as though abortion may cause some cases of breast cancer", and stroll away.
Actually you better run away because the largest study of its kind in Denmark showed there was not abortion/breast-cancer link.
Of course, one could also point out that going full-term versus having an early abortion substantially increases the mortality rate for the mother as well. Using that logic, everyone should have abortions to protect the well-being of the mother by lowering mortality rates.