OBJECTIVEThis study was aimed to investigate the expression and clinical significance of Bmi-1 and P14 in extranodal NK/T-cell lymphoma (ENKTCL) tissue.

METHODSMaxvision immunohistochemistry technique was used to detect the expression level of Bmi-1 and P14 in the tissues of 21 patients with ENKTCL and 11 normal lymph nodes. The correlation of Bmi-1 or P14 expression with the clinical features and the correlation between Bmi-1 and P14 expression were analyzed.

RESULTSThe expression of Bmi-1 protein was higher in tissues of ENKTCL than that in tissues of lymph nodes, and the Bmi-1 expression levels did not correlate with patients' sex, age, lactate dehydrogenase (LDH), International Prognostic Index (IPI) scores and B symptoms (P > 0.05), except for clinical stage (P < 0.05). The P14 protein expression level was lower in ENKTCL tissues than in normal lymph node tissues, which did not correlate with age, sex, LDH, IPI scores, clinical stage and B symptoms. Correlation test showed a negative correlation between Bmi-1 and P14 (r = -0.472, P = 0.031).

CONCLUSIONBmi-1 protein over-expresses in ENKTCL tissues that may display a negative-regulation effect on P14 in the genesis and progress of ENKTCL.