Immunotherapy drug boosters

The gut bacteria influence the function of an immunotherapy drug.
Some of these species are:
Akkermansia muciniphila
Bifidobacterium longum
Faecalibacterium prausnitzii
These species seem to promote immune activation, leading to stronger T-cell responses against tumors.
The most beneficent and impactful one out of these is Akkermansia and this is the one you should be mostly focusing on.
Cancer patients lacking these strains tend to not respond to immunotherapy drugs like Keytruda.
Those patients who did not respond to Keytruda, they did an FMT clinical trial where they took poop, literal poop from cancer patients who’s cancers went away with Keytruda and took their poop and transplanted it to patients who did not respond to Keytruda and the results were those recipient patients then responded to the Keytruda drug.
Poop still contains live bacteria when properly prepared it becomes medicine to patients that need it, in this case patients who don’t respond to immunotherapy drugs.
Now they are doing FMT from healthy donors because healthy people have great gut bacteria that have lots of Akkermansia. 

You don’t necessarily need to do an FMT.
You can increase the Akkermansia bacteria by feeding it. Whatever foods we consume are also eaten by our gut bacteria.
Akkermansia feeds on Pomegranate and Cranberries.
You should also take the actual Akkermansia probiotic here on Amazon  
Faecalibacterium feeds on berries, green tea, cocoa.
Bifidobacterium longum feeds on garlic, onions, asparagus.
You should also take  Bifidobacterium longum probiotics like this one here
If you have done Jane’s course or read her book, it includes the antibiotic Doxycycline. Some people feel uncomfortable taking it because it kills bacteria including good bacteria. 
That won’t be a good idea because who knows, down the road you might need to take Immunotherapy and it might not work due to Doxycycline killing these good bacteria.
Berberine although it’s a natural supplement is documented to kill good bacteria too.