The boceprevir trial is doing 4, 12, 24 wk PCR's and I think several later ones to ensure that 28 wk. TX patients stayed clear (not a question for 48wk. patients).
My trial doc told me that he thinks 12 weeks is a very important signal. My trial is doing EOT visit, 4th week post-EOT and then I think 6 mos. I plan to do a 12 week on my own.
It is 24 weeks, I mean the longer.
I see no reason why not to test at 12 weeks post tx, it is not a must but I would do that.
I wish you all the best.
Jack
I don't know the exact figure but there is a very high correlation between UND at 12 weeks post and SVR.