Testicular Cancer

95% of testicular cancer starts in the germ cells (undeveloped cells that produce sperm). These tumors are most common in men between the ages of 20-40, and are treatable in 95% of cases.

There are two main types:

1. seminomas
2. nonseminomas.

A third type, called stromal tumors, develops in the supporting tissues of the testicle.

About 40% of germ cell tumors are seminomas, which are classified as either typical or spermatocytic. Typical seminomas account for 90% of this type. They often cause unilateral (on one side) testicle enlargement or more often a painless lump in the testicle. Spermatocytic seminomas grow slowly, usually do not spread to other parts of the body (metastasize), and are most common around age 65.

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