Cansema was an amazingly-effective product, that came with a money-back guarantee. It had to be eliminated.
Literature states that the alkaloidal steroid glycosides of the nightshade family have amazing properties, and a 100% cure rate for certain cancers when topically applied, which has been known since at least about 1979. Extracting the active isn't difficult, just tedious.
I wouldn't expect any studies by corporate medicine in this area any time soon.