Cancer is a group of diseases characterized by uncontrolled growth and spread of abnormal cells. According to the National Cancer Institute, it is estimated that there will be about 1,437,180 new cancer cases diagnosed in 2008. Anyone is at risk of developing cancer, and that risk increases as an individual ages. Currently most cancer cases occur in adults who are middle-aged or older, with about 77% of cancer cases diagnosed in persons 55 and older.
|