Los Angeles has lots of resources. City of Hope is highly regarded. If he can find an oncologist who specializes in that type of cancer, that will give him the best chance, as they will have access to more clinical trials and will be most up to date. Medicine is making amazing progress on the use of immunotherapy in cancers right now, though I don’t know if they are using it on gallbladder cancers.
My wife was diagnosed stage 4 melanoma with spread to her brain in 2017. She is now cancer free thanks to immunotherapy and a melanoma specialist at Cedars Sinai. 5 years earlier and she wouldn’t have lasted 6 months.
“Los Angeles has lots of resources. City of Hope is highly regarded.”
I had good results with them ~18 years ago.