The correct answer is that it becomes cancer cells.
Mitosis refers to the kind of cell differentiation, which leads to the formation of two daughter cells, and each comprising the same type and amount of chromosomes as the parent nucleus, generally of ordinary tissue growth.
The process of mitosis should be error free as otherwise healthy cells can turn into cancer cells. Cancer is basically a disorder of mitosis, in this case, the usual checkpoints, which are monitoring mitosis are overridden or ignored by the cancer cells.
Cancer initiates when a single cell is converted or transformed into a normal cell to a cancer cell and is generally taking place due to a modification in function of one of many genes, which usually work to monitor growth, like p53 gene or tumor suppressor gene.
