We attribute our increased success to refinements in technical details and indications for the procedure. Based on these results, a trial to investigate lymphatic mapping and SLND alone in patients with negative SN [SLN] began in October 1995. This trial is soon to be reported and included T1 and T2 (less than or equal to 4 cm) tumors. To date no axillary recurrence has been seen in more than 300 cases at our institution.