Need expert opinions about skin cancer, breast cancer, lung cancer, etc. why does cancer attack a specific part of someone's body?

Biological process: The dna of any cell may mutate and continue to replicate with no end to it. The ability of cells to multiply and differentiate is expressed in the growth of a baby in 9months from a fertilized ovarian cell. From 1cell to a 9-10pound baby in 9months. That ability is in every cell of the body. If the off switch for cell division is lost, cells of any type may replicate indefinitely.