None of the female children being aborted will grow-up to develop cancer.
1.5 million abortion / 2 for number of females / 10 for the % of women who develop breast cancer = 75,000 fewer cases of cancer each year.
And at $400 a pop $7.5 million cures a lot of cancer. That's more than 900 cases of cancer that will never develop. More if you specify you only want to abort female infants.
See! Problem solved.