CD27 and mature T-cell and NK-cell non-Hodgkin lymphoma: Lymphoma samples (N = 130) were analysed for CD70 and CD27 expression and they were categorised in five histological subgroups according to their defined pathology: mantle cell lymphoma (MCL, N = 65), peripheral T cell lymphoma (PTCL, N = 50), NK/T-cell lymphoma (NKTCL, N = 4), anaplastic large cell lymphoma (ALCL, N = 3), and diffuse large B cell lymphoma (DLBCL, N = 8).