Expression levels of miRNAs in ENKTCL FFPE tissues and normal NK cells. The expression levels (measured relative to U6) of (A) miR-10a and (B) miR-342-3p were lower in ENKTCL tissues than in normal NK cells (4.51±1.03×10−3 vs. 9.63±1.88×10−3 and 2.08±0.24×10−3 vs. 5.18±1.08×10−3, respectively; *P<0.05 vs. normal NK cells). The expression levels of (C) miR-22, (D) miR-340 and (E) miR-590-5p did not differ significantly between ENKTCL tissues and normal NK cells. miRNA, microRNA; ENKTCL, extranodal NK/T-cell lymphoma, nasal type; FFPE, formalin-fixed paraffin-embedded; NK, natural killer.