Do you know anyone who has had cancer?  
Yes, my uncle :( Cancer is abnormal cell grown and it can spread.
My mother had breast cancer and it was very aggressive.
I'm so sorry to hear that. Benign tumors don't spread, but cancer is so terrible.
Yes that is why it is important for women to be checked regularly.  When you feel a lump it could be benign or cancer.
Cancer
Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss, and a change in bowel movements. While these symptoms may indicate cancer, they can also have other causes. Over 100 types of cancers affect humans.
Tobacco use is the cause of about 22% of cancer deaths. Another 10
Clinical implications Cancer.
Since its initial discovery, Wnt signaling has had an association with cancer. When Wnt1 was discovered, it was first identified as a proto-oncogene in a mouse model for breast cancer. The fact that Wnt1 is a homolog of Wg shows that it is involved in embryonic development, which often calls for rapid cell division and migration. Misregulation of these processes can lead to tumor development via excess cell proliferation.
Canonical Wnt pathway activity is involved in the development of benign and malignant breast tumors.