I'v seen BCL marked as a negative factor for H&N cancer, but in the following article it looks like he has sailed past the scariest part of the survival curve. The other articles I've seen (but can't put my hand on) indicated that if something bad were going happen, it would have happened already. The interaction between the various factors is complicated, to say the least.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2640025/

I would be surprised if they have enough data to support the 2 year mark for this small subset of patients in a meaningful (statistically speaking) way. My guess is that they are using the more general 2 year benchmark.