Hi Amelia, I’m so sorry to hear about your nephew. Sending lots of love to you and your family.
I saw on the PRC Whiteboard that someone suggested getting in touch with Peter Conway. You can do this through the student clinic. More information is found here: https://www.pacificrimcollege.com/clinical-services/student-clinic/
Another herbalist named Chanchal Cabrera came to mind. She’s an herbalist who does a lot of work with cancer. I saw on her site she’s not taking new patients but you may like to be aware of her regardless: https://chanchalcabrera.com/
Finally, I suggest looking into the work of Paul Stamets and his research on Turkey Tail mushroom for cancer.
If anyone else has suggestions, please share!