I agree with Michael_T , JNF and JohnT that with your high risk diagnosis, you may need bigger guns than IGRT/IMRT monotherapy. Combo therapy with brachy
plus IGRT/IMRT is much more likely to be curative for you. In fact, I just wrote an article about
a recent comparative clinical trial that proved that one can get better results with a brachy boost than with external beam radiation alone:
EBRT + LDRBT boost provides superior cancer control compared to EBRT alone- Allen