Re-radiation may be possible. There is a discussion of doing so at these links:

Re-irradiation of head and neck carcinoma
http://www.ncbi.nlm.nih.gov/sites/e...;list_uids=18846001&tool=MedlinePlus

Re-treatment after full-course radiotherapy: is it a viable option?
http://www.ncbi.nlm.nih.gov/pubmed/10606415?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DiscoveryPanel.Pubmed_Discovery_RA&linkpos=5&log$=relatedreviews&logdbfrom=pubmed

Re-irradiation of head and neck tumors. Benefits and toxicities.
http://www.ncbi.nlm.nih.gov/pubmed/10494516?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DiscoveryPanel.Pubmed_Discovery_RA&linkpos=4&log$=relatedreviews&logdbfrom=pubmed

(along side some of these articles are links to others studies on this subject)

Don
TXN2bM0 Stage IVa SCC-Occult Primary
FNA 6/6/08-SCC in node<2cm
PET/CT 6/19/08-SCC in 2nd node<1cm
HiRes CT 6/21/08
Exploratory,Tonsillectomy(benign),Right SND 6/23/08
PEG 7/3/08-11/6/08
35 TomoTherapy 7/16/08-9/04/08 No Chemo
Clear PET/CT 11/15/08, 5/15/09, 5/28/10, 7/8/11