I would think "5" is referring to the SUV uptake. Anything above 2.5 is suspicious for cancer, but other things can cause this uptake too, like inflammation, necrotic tissue. I heard of Induction Chemo, IC, being given during or after treatment for unresponsive tumors, and is very effective. IC, is usually TPF, Taxotere, Cisplatin and 5-FU, or slight variations, with 3 five day cycles, three weeks apart. 5-FU is administered by continuous infusion for 4 days. The others are high dose infusions given on the first day, 2nd day. I had Induction chemo in 2009, only one week in the hospital, and It's effects were pretty harsh after discharge, actually beyond description, but others are not effected as much. I think I had the worst experience that I've heard of, but it did kill all my cancer, almost me too. I don't know what they plan after that, surgery? Maybe ask that, and about further diagnostic testing or biopsy to see if it is cancer they are dealing with. I think an MRI can show the difference between necrotic tissue or not.