I'm so saddened to hear about this...I don't want to give you false hope.
When my dad was dx with prostate cancer he was 69, his chances were not good they said. He went through treatments for almost a year and still takes the 'Zodiac' treatment daily. He is now 87 and is in remission, and has been for over 10 years.
Where there is breath, there is hope and I'm hoping and praying good news for you and your family. His chances are good and I hope he celebrates many many more birthdays.
Twink...I'm hoping the same for your father.