Would you treat regional lymph nodes in an elderly patient with a triple negative pT2 IDC of the UOQ of the left breast s/p lumpectomy with N0 sentinel node biopsy, but was clinically node negative?

What was the reason SLNB was omitted? While pathological nodal assessment is sometimes omitted, that most commonly applies to patients who are older (age >70) with small (T1) tumors that are ER positive, paralleling the inclusion criteria of CALGB 9343 in which 2/3 of patients did not have pathologi...