IL15 and non-Hodgkin lymphoma: Our group also reported that non-Hodgkin's lymphoma patients with higher expression of interleukin-15 at day 15 after autologous hematopoietic stem cell transplantation was associated with natural killer (NK) cell recovery and survival with a 5-year overall survival rates of 79% versus 47% and 5-year progression-free survival rates of 63% versus 31% for patients with an interleukin-15 equal to or greater than 76.5 pg/mL compared with less than 76.5 pg/mL at day 15 after autologous hematopoietic stem cell transplantation, respectively [9].