NCAM1 and acute lymphoblastic leukemia: CD56 is invariably expressed in normal natural killer cell,73 a subset of normal T cells and occasionally in T cell acute lymphoid leukemia (T‐ALL).74 Studies have implied that CD56 is associated with a poor prognosis in lymphoid tumors, including T‐ALL.74 Therefore, in 2013, Gimenes‐Teixeira et al75 showed that miR‐374 and miR‐221 were higher in T‐ALL/CD56+ than in T‐ALL/CD56‐ cells, with 181‐ and 271‐fold relative expression, respectively.