Save 25% on Ear Drops and premeasured dose pump Nasal Sprays with grapefruit seed extract! Made without gluten. Vegan.ave 25% on Ear Drops and premeasured dose pump Nasal Sprays with grapefruit seed extract! Made without gluten. Vegan.
By Mayo Clinic Staff. Cancer is caused by changes (mutations) to the DNA within cells. The DNA inside a cell is packaged into a large number of individual genes, each of which contains a set of instructions telling the cell what functions to perform, as well as how to grow and divide.
Scientists think that cancer begins when something damages a portion of DNA in a chromosome. The damage causes a mutation and the cells function abnormally. Begins when mutations disrupt the normal cell cycle, causing the cells to divide in an uncontrollable way.