Cancerous cells develop when conditions for cells are favorable, therefore allowing the divisions to continually occur, never stopping. When this happens, a tissue mass of cells called a tumor is formed and does not respond to normal controls regarding cell growth. Cancer cells have the following characteristics: profound changes in the plasma and membrane cytoplasm, abnormal growth and division weakened capacity for adhesion, and lethality. The membrane permeability is intensified and some proteins may be altered or added. Enzyme activities may also change and the cytoskeleton shrinks, causing a chaotic atmosphere. Controls are lost and cell populations will dramatically increase. New proteins cause abnormal increases in small blood vessels. Due to the high numbers, the cells can no longer attach itself to the parent tissue. Unless the cancerous cells are removed, they will kill the individual.