Testicular cancer occurs when cells that are not normal grow out of control in the testicles, or testes. It is highly treatable and usually curable when detected and diagnosed early. In fact, testicular cancer is treated successfully in more than 95 percent of cases. Testicular cancer is most common among white males and least common in men of African or Asian background. Overall, testicular cancer is rare but is the most common form of cancer in men between the ages of 20 and 34.
The testes are the male sex organs that make and store sperm and testosterone. They are located in a pouch below the penis called the scrotum.