I was given a figure of less than 5% for unknown primaries. No, they don't know what area to radiate, although in my case they did suspect that the site might have been the back of my throat, so they radiated everything from the bottom of my earlobes to my armpits. This was XRT not IMRT.

Take care,
Eileen


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Aug 1997 unknown primary, Stage III
mets to 1 lymph node in neck; rt ND, 36 XRT rad
Aug 2001 tiny tumor on larynx, Stage I total laryngectomy; left ND
June 5, 2010 dx early stage breast cancer
June 9, 2011 SCC 1.5 cm hypo pharynx, 70% P-16 positive, no mets, Stage I