Which pathologic features do you use to determine VCB vs pelvic RT in Stage IA/IB endometrial patients in the era of Sentinal Lymph node Biopsy?

The decision for adjuvant treatment type for us is based on similar pathological features for node negative endometrial cancer whether node negativity is based on SNL or dissection or sampling

Recent randomsied study shows 99% negative predictive value in patients in whom sentinel node is identified...