- The peak of onset is ages 20-40 with another rise after age 60. The incidence is variable among different ethnic groups, but African Americans have approximately one third the incidence of Caucasian populations. Patterns of genetic inheritance have emerged yet account for a small overall percentage of these lesions.
- Seminomas account for 30-60 of these lesions and mixed germ cell tumors represent up to 60 percent of lesions. Pure choriocarcinoma occurs in one percent of lesions, while pure embrynonal [3-4%] and pure teratoma [5-10%] make up slightly higher proportions of reported series
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