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.
Aproximadamente 30 anos atrás, quando eu era oncologista no Hospital Infantil da Filadélfia, um pai e seu filho vieram ao meu consultório e nenhum dos dois tinha o olho direito, e quando anotei seu histórico, verifiquei que ambos tinham uma forma rara de tumor ocular hereditário,  o retinoblastoma, e o pai sabia que tinha passado este destino para seu filho.