What intracavitary brachytherapy dose (and fractionation) would you recommend for stage I vaginal cancer post-resection with positive (R1) margins?

Presuming nodes have been addressed or don’t need to be addressed.

For brachy alone cases, I have done 6 Gy x 6 to GTV area with MRI planning with the first 4 or 5 fractions treating longer length especially if has VIN for microscopic dose and disease.