Your friend can obtain a recommendation quickly and easily at Medicann. You can make an appointment at any of their locations in Southern or Northern California from their website or by calling. Your friend should fax medical documentation of his condition to Medicann's main office, and verify they received it, before his visit.
Now, the trick is going to be finding the oil. I haven't seen the movie yet to see if this is a special kind, but they sometimes sell the oil laden with THC in bottles. Other times they have tinctures, which is an alcohol extract. Since I haven't seen the movie yet, I don't know if that would work. I had heard that people rub them into the skin to treat pain, and considering there are studies by John Hopkins and others which have shown that cannabis compounds shrink tumors in mice it makes sense.
If you go to my thread about the DEA bearing down in my town, you'll find out why many of the dispensaries around me are shutting down at the end of the month. There are still many others out there, and one way to find them is at weedtracker.com . I would recommend calling around and finding a place that has the oil, but make sure they know that you want to use it on your skin because there are also hash oils that are smokable, but I don't think you would want to put it on the skin, but I'll have to checkout that film to see what they are talking about.
Also, 2 tsp/day of NON-filtered apple cider vinegar (shake well each time before pooring) in 8 oz. of water balances the pH of your blood, making it inhabitable for cancer. This is better as a preventative, but it's still good for those with the condition. I would also consider raw apricot seeds, aka B17. Those are supposed to help cure it, but of course all cures are best done in the early stages rather than the later stages.