IFNG and B-cell chronic lymphocytic leukemia: At the same time, the CLL patients with preexisting T cell responses at each time point studied demonstrated higher numbers of the virus-specific IFNγ-producing T cells: 498.3 [177.5–1106.7], 1135.0 [504.2–1500.8], and 1230.0 [606.7–1625.0] on d1, d21, and d49, respectively.