Wow, I am just so SO sorry to hear about this...
Is your friend open to any sort of alternative or natural therapy? I am not a believer in cures, but I do think that there are things that can be done to manage the cancer better that doctors do not recommend, since it is taboo to recommend supplements or radical diet changes in Western medicine.
I can definitely see how naturally boosting one's immune system could help one withstand cancer treatments better, and making a diet change, such as embracing a raw diet or another diet rich in vegetables with minimal processed food, could be beneficial since cancer cells multiple quicker when the body produces excess insulin.
At the very least, I feel like doctors should refer patients to someone who can discuss alternative therapies to complement the conventional ones...instead of just telling you that you're going to need to be scalded with radiation and poisoned with chemotherapy. Taking an anti-nausea pill isn't the only thing you can do to make it easier to cope with the treatment.