There was a drug called Rapamycin discussed in this Radiolab episode https://radiolab.org/podcast/dirty-drug-and-ice-cream-tub

The drug supposedly helped delay the doctor's cancer and extend his lifespan until he stopped taking it, then it came back "with a vengeance" and he passed away. He wanted to stop taking it to verify whether it was actually working or not.

I wonder if it might help this person? He might have to be on it for life though.

Don't take my word for it though, this is FAR from my field of expertise.