Testicular Cancer

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Types

Most (95%) testicular cancer originates in undeveloped cells (germ cells) that produce sperm. These tumors, called germ cell tumors (GCTs), are most common in men between the ages of 20 and 40 and are curable in more than 95% of cases. There are two main types: seminomas and nonseminomas. A third type, called stromal tumors, develops in the supporting tissues of the testicle.

Approximately 40% of GCTs are seminomas, which are classified as either typical or spermatocytic. Typica...Read the full article