When my husband Tom had his re-occurance with an inoperable tumor - his 'then' onconogist told us that chemo or radiation would not help and that he had 6 months at the most.
I would not accept that answer and we got 2nd, 3rd and 4th opinoins. Although they all agreed that the new tumor was inoperable because it involved the hepatic artery - they all felt that radiation and / or chemo could help.
Tom underwett 28 rounds of radiation, then started oral chemo (Xleoda) and later when through IV Chemo (Gezmar and Cisplation) The IV chemo was because a radiologist mis-read a scan and said there was a tumor (Mass) by his bladder in the pelvic region. After about 5 rounds of IV chemo, they discontinued the chemo.
Since that 6 months 'death sentence' Tom is still here with me. Some 20 months later. My advice, get another opinoin and find someone willing to take a chance on radiation. It may give your Dad a longer time to be with his family. Even at the onset before Tom started on radiation they told us that they could not guarentee the outcome...but so far we are vey happy with results...anything was better than 6 months.
Go with God and KEEP KICKIN' THAT cancer!