In a patient with rectal cancer, when would you consider brachytherapy monotherapy or brachytherapy boost after CRT?

For a patient with cT2N0 disease, the most appropriate use of brachytherapy would be sequential with pelvic radiotherapy, the bulk of data being with long-course CRT. Brachy can either be done prior to CRT or sequenced afterwards. We routinely use brachytherapy in appropriate candidates in our pract...