Where do cancer cells come from in the body?The appearance of a tumor in the first approximation is the process of accumulation of mutations, that is, errors, in the genome of cells. As a rule, these are gene mutations associated with either proliferation (cell division) or apoptosis (programmed cell death).
In the process of mutation, some group of cells gets out of control, starting to divide uncontrollably. This is how a tumor is formed, each cell in which is mutated. Soon after the formation of a tumor, cancer cells can break away from the primary focus and metastasize - transferred to other organs (for example, with blood flow), forming tumors throughout the body.
Autopsy 18+
