ALK and mature T-cell and NK-cell non-Hodgkin lymphoma: The estimated CR rate for PTCL subtypes when analyses are limited to prospective studies were as follows: NK/T 72.7% (95% CI 53.3–86.1%), ALK-negative ALCL 61.6% (95% CI 23.6–89.3%), ETTL 43.3% (95% CI 20.1–69.8%), and AITL 34.3% (95% CI 23.3–47.4%), which differ somewhat from the response rates reported above.