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Optic nerve tolerance & risk
Stupp 2009 - risk with 55/60 Gy + TMZ
1 patient affected ~ 20% - dose assumed to be 60 Gy
~ 200 alive at risk at 9 months
~ 100 alive at risk at 2 years
~ 20 pts at risk
Therefore risk* ~ 1 in 20 = 5%
But 17pts alive @ 5 years