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.
Há aproximadamente 30 anos, quando eu estava na oncologia  do Hospital infantil, em Filadélfia, um pai e o seu filho  entraram no meu gabinete e a ambos faltava o olho direito. Quando vi o historial deles, ficou claro que pai e filho  tinham uma forma rara de tumor ocular hereditário,  um retinoblastoma. O pai sabia que tinha passado  aquela herança ao filho.