What dose and fractionation do you use for gynecomastia prophylaxis?

As I answered on a previous thread to a question that was similarly posed, philosophically I would prefer electrons (less integral dose/more focused - IMHO) as opposed to photons. In terms of dose, it seem these days less is better with single fraction especially. Hence, the NICE (European) guidelin...

I treated a patient a few years ago who developed gynecomastia and mammodynia while take both leuprolide and enzalutamide.

I went with 20 Gy in 5 fractions using an en face electron setup. There was moderate reduction of the gynecomastia (it was not prominent to begin with) and complete resolution ...