I need info from our experts on here about how to figure out my stage of cancer.
Dr. Lewis at MD Anderson said I'm T4N0M0, does that mean I'm stage IV? Thanks to you all

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