english: 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.
non_english: Pre otprilike 30 godina, dok sam bio na onkologiji u Dečjoj bolnici u Filadelfiji, u moju kancelariju ušli su otac i sin i obojica nisu imali desno oko. Iz istorije bolesti postalo mi je jasno da su otac i sin imali redak oblik naslednog tumora oka, retinoblastom, i otac je znao da je preneo bolest svome sinu.