It seems like your dad's cancer is in a very advanced stage. Surgery wouldn't help at this point, but there are still some drugs that might help him. Torisel is one, and some people get good mileage out of Sutent or Nexavar. In my husband's case his kidney cancer had spread to both lungs (more than 30 tumors in the lungs), and Torisel literally saved his life and gave him 8 good months. The Torisel finally stopped working, but he's on Sutent now and doing fairly well. Still has good quality of life despite some horrible side effects.
Your dad's overall prognosis is very poor, but depending on his overall health and attitude, he might be able to get some good mileage out of some of the medicines that are currently available.
Best Wishes,
Twiddles