1. Ataxia Telangiectasia (includes Ataxia Telangiectasia 12 Complementation Groups A, C, D, E, Louis–Barr Syndrome) 2. Basal Cell Nevus Syndrome, Nevoid Basal Cell 18 Carcinoma Syndrome, or Gorlin Syndrome 3. Beckwith–Wiedemann Syndrome 19 (Exomphalos–Macroglossia–Gigantism Syndrome) 4. Birt–Hogg–Dubé Syndrome 20 5. Bloom Syndrome 21 6. Breast/Ovarian Cancer, Hereditary (BRCA1) 22 7. Breast/Ova...