IFNG and lymphoma: The antigen-specific T-cell response in the lymphoma group, as analyzed by IFN-γ ELISpot assay using PBMCs, showed no statistically significant difference between ‘on’ and ‘no treatment’ groups (median 76.2 IFN-γ spot-forming units (s.f.u.)per 106 PBMCs (95% CI 50.8, 110.0) versus 45.10 (27.97, 57.13)) (Fig. 2f).