What dose and upper field border would you use following transanal excision for rectal cancer found to be T2 by final pathology but without LVSI or perineural invasion?  

Should standard post operative radiation fields be used, treating up to the L5-S1 interspace? Or is it acceptable to treat a lower field, for instance the true pelvis? Is there agreement that a local boost to approximately 54 Gy is appropriate for patients without positive margins? Same dose for T2 or T3?


Answer from: Radiation Oncologist at Academic Institution