You said your father had mets to the liver. he might try
Artemisinin. I know of a case in which a man had leimyosarcomoa with mets to his liver. Doctors found it with a scan (CT or MRI) . He took artemisinin and 3 weeks later went in for a pre-op scan. The doctors were stunned! They canceled his operation and said they would continue scans until they found tumors!
I do not know any more than this as I lost contact with him in the leiomyosarcoma website.
I took artemsinin for a peas-sized tumor in my scrotum. The tumor shrunk by half every five days until the 20th day when it was gone! that was 4 years ago! I never went to a doctor for it!
I purchased my (Artemisinin by Nutricology) at fernsvitamins.com
It was $17.70 /bottle with 90 caps I took 2 caps morning, noon, evening and at bedtime with water (no side affects!). I now take one capsule morning and at bedtime as a preventative. Also, it was supposed to work on hemorroids! Yes, it does, my hemorroids disappeared!!!
I have no financial relationship with the above companies