Familial testicular cancer in a population-based cancer registry.

The population-based Connecticut Tumor Registry was used to identify 18 testicular cancer cases (diagnosed 1973-1991) with a family history of testicular cancer (including 4 father-son pairs and 8 sibling pairs) and to describe the age at diagnosis, histology and other characteristics of these familial cases. Collaboration among cancer registries is needed to identify cases for genetic studies.