NK-cell activation is inhibited by immunosuppressive monocyte/macrophages in patient samples ex vivo. Patient PBMC, with or without monocyte depletion, was co-incubated with K562 and CD137 quantified on CD16^+/− CD56⁺NK-cell subsets in (A) healthy participants. (B) patients with cHL, and (C) patients with DLBCL.