What is the current suggestion on using cannabis to deal with prostate cancer?

If by "current suggestion" you mean reports in the scientific literature or similar authoritative sources, I'm sorry to answer that while cannabis appears to possess potential benefits for patients with cancer, no actual parameters for successfully treating prostate or any other cancer with medicinal cannabis have yet been determined through clinical science. If you are referring to suggestions for reducing the discomfort of symptoms associated with prostate cancer, cannabis may provide benefits depending on the nature of the symptoms. Without knowing more about a particular case and the troubling symptoms it is hard to make a blanket recommendation. I would also point out that cannabis is remarkably non-toxic and therefore cautious experimentation with different preparations to find what seems most helpful for particular symptoms is generally a reasonable strategy.