Rudy Giuliani is defending the survival rates he quotes when talking about his prostate cancer, amid criticism he understates the figures and makes unfair comparisons. In a radio ad running this week in New Hampshire, Giuliani says: "My chance of surviving prostate cancer, and thank God I was cured of it, in the United States: 82 percent. My chances of surviving prostate cancer in England: only 44 percent under socialized medicine." The American Cancer Society says the survival rates are actually higher and it is misleading to compare the two countries. Regardless, Giuliani said Friday, his point is clear. "Even if you want to quibble about the statistics, you find me the person who leaves the United States and goes to England for prostate cancer treatment, and I'd like to meet that person," he told reporters in Washington.