A dharmanol full strength is what your gonna need.
Post# of 36728
The red diamond oils, and other types of THOSE kind of hashes would be for less serious things like back-aches, muscle spasms, things like that- Not to say they dont have a role in fighting cancer, but I dont think your colleague could handle eating too much of the REALLY potent (70%+ THC) Oil/Hash
For something invasive and serious like Cancer you'll want either organikol or The highest strength dharmanol he can handle, as much as he can take.
If I wasnt at work I could help so much more--
In regards to method of ingestion...EAT it!!!!! studies have shown that eating your raw Flower(or juicing) is wayyy more healthy than smoking/vaping and more effective than cooking.