Since the international prognostic index (IPI), presence of B‐symptoms, and the expression of cytotoxic molecules are currently recognized as prognostic factors in PTCL‐NOS,35, 36, 37, 38 we simultaneously integrated these known prognostic markers and TERT expression in a multivariate analysis to show the risk of each factor (Table 2). The gene discussed is TERT; the disease is mature T-cell and NK-cell non-Hodgkin lymphoma.