8. HER2 is a receptor that is present at excessively high levels in some breast cancer cells. Herceptin is a protein that binds to HER2 and inhibits cell division. Herceptin may be an effective arug for breast cancer treatment under which of the following conditions? (A) The patient lacks functional HER2 proteins. (B) The patient has excessive levels of receptor for other growth factor (not HER2) in cancer cells. (C) The patient's cancer cells have excessive levels of HER2. (D) Injection of HER2 into the patient's cancer cells inhibits ceil division. (E) Injection of HER2 into the patient's cancer cell nuclei inhibits cell division.