Model released. Chemotherapy. Doctor preparing an intravenous infusion with the anticancer drug etoposide for a patient suffering from myeloid leukaemia. The preparation is covered with a black bag to protect it from light. Myeloid leukaemia results from uncontrolled proliferation of the class of white blood cells known as polymorpho- nuclear leukocytes. Anticancer drugs are used to stop these cells from multiplying. The drugs used in chemotherapy act on all rapidly dividing cells not just cancer cells. Thus, they may affect the bone marrow, the hair follicles, the ovaries and the testes, sometimes causing severe side-effects.