Antiviral and immune boosting herbs can help, but since it is spread to the liver I really advise the ozone. Liver cancer tends to be very aggressive and more aggressive therapies are really needed.
Herbs such as chaparral or black walnut would be especially good choices since they also inhibit cellular division of cancer cells. As long as he has a G-tube though leave the chaparral alone since its highly resinous nature can make it stick inside the tube.
Suma, chagas or birch bark would also be excellent choices.
Can you send me a private message with where you are located?