Patients with tumors with LMP-1- positive HRS cells had higher serum interleukin 10 levels (P = 0.009 by Mann-Whitney test).

The 5-year FFS was not statistically different when cutoffs of 5% up to 50% for CD20- positive HRS cells were used.

A tumor was considered positive if any HRS cells expressed CD20, but other cutoffs for number of CD20- positive HRS were also investigated.