Like I mentioned earlier - this re-radiation concept is in clinical trials so your docs might not have heard of it yet. The spine is at risk as you mentioned so they have to work around that by careful programming, beam blockers and various other techniques.

Here are some clinicals trials:
http://www.moffitt.usf.edu/Prevention_and_Treatment/clinical_programs/headneck/studies.asp

http://www.ncbi.nlm.nih.gov/entrez/...&list_uids=2625112&dopt=Abstract

http://www.moffitt.usf.edu/pubs/ccj/v9n5/pdf/387.pdf

Gary Allsebrook
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Dx 11/22/02, SCC, 6 x 3 cm Polypoid tumor, rt tonsil, Stage III/IVA, T3N0M0 G1/2
Tx 1/28/03 - 3/19/03, Cisplatin ct x2, IMRT, bilateral, with boost, x35(69.96Gy)
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"You are a mist that appears for a little while and then vanishes" (James 4:14 NIV)