Fractionated vs. single fraction SRS for brain mets... What's your cut-off?

I am tending to fractionate tumors I can't get 20/1 into or at least 18/1. Under 2 cm/3cc or so I'll do 20/1 2-3cm / 3-14 cc I'll do 18/1 Towards the upper end of that range, I start thinking more about fractionated SRS, and > 14-15 cc I go 27/3. Not doing any single fraction < 18. Is anybody else? I don't like that grey area very much, and can't find a lot of good data on this. Curious how everyone else is approaching these 2.5 - 3.0 cm borderline tumors. And also for fractionated... Fractionated vs. single fraction SRS for brain mets... What's your cut-off?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Radiation Oncology Source Type: forums