✔ 最佳答案
Not with absolute certainty, but certain breast cancers run in families, and a gene for them has been identified. You can be tested for it. If you have it, it increases your chances of developing breast cancer, though you will not necessarily do so.
Colon cancer can run in families, though a specific gene has not, so far as I know, been identified. Reseachers are still working on that and other possible cancer genes.