(((HUGS))) My father had this, but it didn't spread to his liver. I don't think he changed his diet, at all. I wish I knew what he could eat, but I don't. Maybe talk to his dr about what he can't eat and we can come up with some dishes that will work for him.
From Michael Berg:

Every person has a unique connection to the Creator that can never be extinguished, and every person has a great soul that can manifest important things in our world. To make a person feel less than they are because of something inside themselves, be it faith, race, or sexual orientation, is the greatest sin of all."