The skin does not continue to grow beyond normal limits. In cancer, however, the cells are not getting the proper signals to start or stop growth, so they continue to grow without regulation. A group of cells growing uncontrollably is called a tumor. This process can occur anywhere in the body. There are many different kinds of cancers.
Cancer is most curable when detected at an early stage.
For example, there are genes for eye color, hair texture, and blood type as well as genes that give us a tendency or predisposition to develop certain disorders and diseases, such as heart disease, diabetes, and cancer. Normally, we have two copies of each gene. We get our genes from our parents, inheriting one copy of a gene from our mother and another copy from our father. Thus, if a mother or father has a gene mutation, this mutation could be passed on to their children. Most cancers are due to an accumulation of damage to the DNA in our cells.