JEANNE MESERVE, CNN ANCHOR: Senator John McCain, Republican of Arizona, will undergo more tests today and tomorrow for a dangerous form, potentially dangerous form of skin cancer. CNN medical correspondent Elizabeth Cohen is following the story from Phoenix. Elizabeth, what's the latest?</s>ELIZABETH COHEN, CNN MEDICAL CORRESPONDENT: Well, the latest is that early this morning Senator McCain left his home to go to the Mayo Clinic in Scottsdale, Arizona, to undergo tests for two spots of malignant melanoma, one on his arm and one on his temple. Now he is still undergoing tests, that's what our sources tell us. And he may undergo surgery as soon as this weekend. But that's not yet been determined. Now, of course, we can't speak directly to the specific test that Senator McCain is having today, but we can speak generally about melanoma, and the kinds of tests and procedures the doctors do. Surgery is almost always the course of treatment for melanomas. They're removed from the skin and some of the healthy tissue around it as well. And then there's another test that's called the sentinel node biopsy. And that's to -- the first step in determining if the cancer has spread into the lymph nodes. Now the cure rate when it's just on the surface of the skin, is very high. The cure rate, once it's gone into the lymph nodes, it goes down. It goes down even further if it's spread to other organs in the body through the blood. And that's what doctors are trying to determine today, what stage, what level his melanoma's at, and what the proper course of treatment would be -- Jeanne.</s>MESERVE: Elizabeth Cohen, thanks for joining us.
Democratic National Convention: McCain to be Tested for Specific Stage of Melanoma