20c, does it make a difference ..... are you kidding???? Scores like that are a dream come true - the only thing you should be worrying about right now is how best to celebrate.
Curative - usually 37 sessions or thereabouts
Control - often between 1 and 5 sessions.
Your OH was almost certainly put onto a curative path, judging from his scores. Control RT is reserved for pain management or to slow down growth in men with advanced disease and that clearly does not apply to you.