My mother-in-law, who was diagnosed with nasopharyngeal carcinoma last year, was also desperate. Later, after radiotherapy and chemotherapy, the effect was average, and lymphatic metastasis was found.
Later, through unremitting efforts, I have been looking for the best diet therapy. After particle implantation, cancer cells can no longer be detected. Now I'm in good spirits. Except for the side effects of radiotherapy and a little dry mouth, other diets and labor are the same as those of healthy people.
Therefore, never give up treatment. You can't tell which method suits your physique, and you can recover in a short time.
May your friend recover, too.