Testicular cancer is cancer in one or both testicles, a part of the male reproductive system. In the United States, about 8,000 to 9,000 people are diagnosed with the cancer every year. Every male has a 1 in 250 (four tenths of one percent, or 0.4%) chance of being diagnosed with it. It is most common among males aged 15-40 years. Testicular cancer has one of the highest cure rates of all cancers; more than 90%. This is most often achieved by removing one or both testicles. Even in the small number of cases where the cancer has spread widely, chemotherapy offers a cure rate of at least 50%.