Dear Jenrose,
I would be happy to help you. First, yes Gemzar and Gemcitabine are the same drug. My husband's cancer had infiltrated his entire left side of his liver and was starting into the right side. He had also gotten into a lymph node--which they were able to remove during the first surgery. It had also started to attach to his stomach.
You may also want to ask your doctor about embolization--where they go up through the blood vessels and place radioactive beads to fight the cancer. I believe this is a fairly "new" treatment for some cancers. An "interventional radiologist" is the one who goes through the vessels.
Let me know if you want our doctors' phone numbers. Good luck with your Dad. Remind him that new treatments are coming out all of the time. He needs to keep a positive attitude and not lose heart.