Assume the trial is using HDR Brachytherapy.

EBRT with brachytherapy boost has long-term good results.

SBRT monotherapy in five sessions has shown good results (recent data indicating it may be a little better than HDR monotherapy for some patients).

I would expect this proposed trial to have good results for favorable and intermediate patients.

I would think HDR boost would be preferred over LDR.

I have not had treatment yet. I am researching SBRT vs HDR vs Prostatectamy.

My Radiation Oncologist indicates she does not use spacer gel with HDR. Her experience and data indicates it is not necessary and may hinder treatment a little. Placement of HDR is precise enough to not need spacer gel.

In this trial, you would want to understand spacer gel usage for the external radiation, and how it may impact brachytherapy boost.

Best Wishes.