I have read of just such a case (no, I can't cite a source) All her sisters and mother and grand mother had breast cancer and she found a doc to remove her's as a preventive measure.
Not reccommended for everybody.
I have as well. When my son is an adult, if he feels he is highly likely to develop penile cancer, he will have my wholehearted support in undergoing a circumcision.
Before he was born, I saw no evidence compelling enough to take the risk with a newborn baby.