T helper 17 (Th17) cells are a subset of T cells with the ability to produce the pro-inflammatory IL-17 cytokine, which has an important role in the migration of neutrophils into the inflammation site and in the stimulation of the granulopoiesis at the bone marrow [40], as well as in the recruitment of IFN-γ-producing CD8+ T cells by the tumour [41]. The gene discussed is CD8A; the disease is neoplasm.