What do the initials NED mean? Thanks

Debra 57 y/o female,
5-2-11 dig. Scc well diff invasive gum cancer
5-17-11 consult MD Anderson
6-15-11 mandibulectomy, w/fibula free flap, rem all teeth, neck diss removal 75 nodes one side, IRMTx30, 1.2cm submucosal tumor invading tooth socket. cT4N0M0 (IVb)
1-24-12 clear CT scans to date