GOod observation, having KM curve beyond median for both treatment arms would be kosher to allow estimate of median OS. I agree, 275 probably is a better event goal.
Just realized my estimate did not factor in the 2:1 ratio. The updated calculations are as follows:
End of Deaths 06/2007 196 12/2007 248 06/2008 291 12/2008 325 06/2009 355 12/2009 377 06/2010 397
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