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.
Chemotherapy is the use of drugs to destroy cancer cells. It works by keeping the cancer cells from growing and dividing to make more cells. Because cancer cells usually grow and divide faster than healthy cells, chemotherapy destroys them more quickly than it destroys most healthy cells.Since the drugs used for chemotherapy are powerful, they cause damage to many growing cells, including some healthy cells.