Sorry to hear about your friend; awful for both of you.

Anything you can build or brew at home? About as good as chanting spells at the moon on alternate Tuesdays. And definitely do NOT go get infected with some virus, which will only create greater complications and misery.

The only real chance I'd see out there is to get into a trial of some of the new immunotherapy treatments [0]. These create custom profiles and turn the body's immune systems against the cancer and have had some stunning successes — talk about biohacking — these researchers are out there!

Of course these are still in development. There is a lot of research going on around Boston [1-5], Mayo Clinic [6], and other research hotbeds.

Locating teams researching therapies applicable to your friend's cancer type, and hacking your way into one of those trials would likely be one of your best hacks ever; I'd focus on that. Gather the info, find out what it takes to get into the trials, get your friend qualified...

Best of luck - I hope you can organize a great recovery for your friend!

[0] https://www.cancer.gov/about-cancer/treatment/types/immunoth...

[1] https://www.bidmc.org/research/research-centers/cancer-resea...

[2] https://www.massgeneral.org/cancer-center/clinical-trials-an...

[3] https://www.bumc.bu.edu/immunology/research/cancer-immunolog...

[4] https://www.bmc.org/content/immunotherapy

[5] https://www.ludwigcancerresearch.org/location/boston-harvard...

[6] https://www.mayo.edu/research/centers-programs/cancer-resear...

Thanks a lot. I am in France though (should have said in the main text), and I don't think there's any fancy trial going on in France currently. Hopefully your comment can help someone else !