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| Group | Family structure | Number of index cases per family type | Total number of TGCT cases |
|---|---|---|---|
| Family history | 167 | ||
| Sib pair | 75 | ||
| Sib trio | 2 | ||
| Father/son pair | 28 | ||
| Cousin pair | 25 | ||
| Large >3 affected cases | 11 | ||
| Uncle nephew pair | 18 | ||
| Grandfather/grandson | 4 | ||
| Twins (MZ) | 4 | ||
| Sporadic | 96 | ||
| UDT | 8 | ||
| Total | 271 |
GCT=testicular germ cell tumour; UDT=undescended testis.
