Cancer is a disease in which cells grow uncontrollably and form tumors. The best chance of surviving cancer usually involves finding and treating it early.
The word cancer actually means "crab," like the zodiac sign. Around 400 B.C., Greek physician Hippocrates is said to have named the disease karkinos, which is Greek for "crab," when he noticed that tumors formed a crab-like shape. The word cancer describes not just a disease, but any sort of evilness that can spread. Hatred and bigotry are cancers that can destroy communities.