I'm a 27 y.o male. If my paternal grandma had breast cancer (treated 12 years ago, still alive), does that increase my cancer risk?

Good question. From a guy, genetic implications are more to female Male breast cancers are rare 1% of them are in men (male breast cancer) At 27 don't worry about any cancer, eat health balanced diet with regular exercises avoid any chemicals (substance abuse) and be happy.