Moomon -
While it's true that one out of every three people in this country will experience some form of cancer during thier lifetime, it's also true that more people are living with and overcoming cancer than ever before!!!!
Cancer is something that's grown, not something genetics provide us with. (I say this because I am the first one in my family to have cancer - and I've been cancer free for almost one year!)

) While some families may be pre-disposed to cancer, it's something we can't allow ourselves to become obsessed with. Diagnostic testing should become a regular part of our annual healthcare regime. Early detection is vital...
The knot or lump your Mother has, could be lots of things. Most of which are not cancerous. It's important for her to see a physician and have it checked out. If biopsy results reveal it is cancer, get a referral to an oncologist. Then get a second opinion. If it's cancer, don't ever give up. Cancer sucks, but there IS hope. It's okay to be worried, but you've got to be strong for both you and your Mom.
Hang in there. We'll keep you both in our prayers.
Husker