If you are asking if there is any evidence that micro dosing can "cure" prostate cancer I would have to say no. However if there is pain involved due to spread of cancer then cannabis can indeed help to lessen the pain. The National Academy of Science in January of this year stated that there is sufficient evidence to say that it is indeed helpful.
Another point would be that there is no evidence that micro-dosing is harmful in any type of cancer, prostate included.
Perry Solomon, MD