Approximately 30 years ago, when I was in oncology at the Children's Hospital in Philadelphia, a father and a son walked into my office and they both had their right eye missing, and as I took the history, it became apparent that the father and the son had a rare form of inherited eye tumor, retinoblastoma, and the father knew that he had passed that fate on to his son.
Circa 30 anni fa quando ero in oncologia  nell'ospedale infantile di Philadelphia, padre e figlio entrarono nel mio ufficio, ad entrambi mancava l'occhio destro, e come sentii la loro storia,  divenne evidente che padre e figlio avevano una rara forma di tumore ereditario all'occhio,  il retinoblastoma, il padre sapeva  di aver passato quella sorte a suo figlio.