Pertinent quotes from the site Adrienne posted:

http://www.second-opinions.co.uk/animal_fat_breast_cancer.html

"If eating animal fat increased the risk of breast cancer, one would expect
that the more animal fat is eaten, the more breast cancer there will be.
That is clearly not the case. Those eating the most animal fat (5th
quintile) have less breast cancer than those eating less (3rd and 4th
quintiles). That is the first sign that something is not quite what it
should be."

"And, again the data show clearly that the ones who ate the most fat had
less breast cancer than those who ate less. The numbers with cancer in the
two highest intakes (4th and 5th quintiles) was less than the numbers in
third."