When cancer develops, however, this orderly process breaks down. As cells become more and more abnormal, old or damaged cells survive when they should die, and new cells form when they are not needed. These extra cells divide without stopping and may form growths called tumors.
Cancer cells differ from normal cells in many ways that allow them to grow out of control and become invasive one important difference is that cancer cells are less specialized than normal cells. That is , whereas normal cells mature into very distinct cell types with specific functions cancer cells do not. This is one reason that, unlike normal cells, cancer cells continue to divide without stopping
In addition, cancer cells are able to ignore signals that normally tell cells to stop dividing or that begin a process known as programmed cell death, or apoptosis, which the body uses to get rid of unneeded cells
How the cell wall is and how stages of cancer break it and go all over the body
