Stage 4 gastric cancer..

Hey guys.. My dad has been diagnosed with an adeno carcinoma in his stomach. This mass has been growing to a point where doctors dont want to operate. Our medical oncologist said that the only thing we can do is chemotherapy.. But without the surgery i think its pretty useless. We asked about how long my dad will have without any conventional treatment and the dr said that itd be a matter of months. The main concern is a fluid on his pelvic area that seems to be metastatic.

I know, from a friend's mom, that there are alternate ways to treat a disease such cancer by using the gerson diet. I also have heard of the burzinski clinic. Is anyone following the diet or burzinski's method? We have been trying high doses of vitamin C and mistletoe injections; we also give my dad some curcumint extract and graviola ( sour sop extract)

Please, help me with any info on how to battle this. i'd be very grateful..