IFNG and mature T-cell and NK-cell non-Hodgkin lymphoma: Only IL-6, IL-10, and IFNγ were found to have statistical significance on the survival and prognosis of PTCL patients and the median value and range of serum levels of these three cytokines were as follows: IL-10 (3.13 pg/ml, range: 0.1–8536.4 pg/ml), IL-6 (6.65 pg/ml, range: 0.1–815.2 pg/ml), and IFN-γ (1.44 pg/ml, range: 0–1330.9 pg/ml), respectively.