There are tens of trillions of cells in the human body, and new cells are constantly forming as older cells age and die. But sometimes, cell growth and replication doesn't stop when it should. These ...

There are two main types of lung cancer: small cell and non-small cell. According to the American Cancer Society, non-small cell lung cancer is often categorized in one of two stages: limited or ...

(CNN) — Here is some background information about stem cells. Scientists believe that stem cell research can be used to treat medical conditions including Parkinson’s disease, spinal cord injury, ...