Welcome to GRACE. Since radiation beams can penetrate human tissue without a problem, the only reason that a patient could be too large for proton therapy would be the physical limitations of the scanner itself (the amount of space between the scanner and the platform on which the patient lies). You might want to inquire if that is the limiting factor in your friend’s situation. If that’s the issue, you may be able to find another facility which has a scanner with sufficient clearance.
There is also the issue of whether your friend’s situation is one in which proton beam therapy is likely to be superior to standard SBRT, as in many cases it is not. Proton therapy gets a great deal of hype because it’s the newest technology, but its increased targeting accuracy is not needed in most cases, as standard SBRT is already quite accurate.
Jul 2008 Wife Liz (51/never smoker) Dx Stage IV NSCLC EGFR exon 19
4 cycles Carbo/alimta, 65% shrinkage
Mar 2010 progression, added Alimta, stable
Sep 2010 multiple brain mets, WBR
Oct 2010 large pericardial effusion, tamponade
Jan 2011 progression, start abraxane
Jun 2011-New liver, brain mets, add Tarceva
Oct 2011-Dx Leptomeningeal carcinomatosis; pulsed Tarceva
At rest Nov 4 2011
Since then: http://cancergrace.org/blog/jim-and-lisa