Focal Therapy

I have been diagnosed with grade 1 cancer of the prostrate following a biopsy and am currently on Active surveillance  I.E. 3 monthly blood tests. 

At some point I will have to make a decision about the choice of treatment, if and when the cancer grows. As documented elsewhere there are usually only 3 types of treatment generally available. However we are hearing on the news more & more about Focal Therapy and it's various forms. Does anyone have personal experience of this form of treatment?

Frankie53