[Plasma Levels and Clinical Significance of Cytokine Profile in Patients with Multiple Myeloma]

To investigate the levels of cytokines in the plasma of patients with multiple myeloma(MM), and explore its clinical significance.

The levels of 6 cytokines(IL-2, IL-4, IL-6, IL-10, TNF-α, IFN-γ) in the plasma of 59 newly diagnosed MM patients and 30 healthy controls were retrospectively analyzed, and the immunophenotypes were also analyzed. The plasma levels of IL-2, IL-4, IL-6, IL-10, TNF-α and IFN-γ were quantitatively detected by flow microsphere technology, and the differences of cytokines levels in each group were tested by Wilcoxon.

The plasma concentration of IL-2, IL-4, IL-6, IL-10, TNF-α, and IFN-γ in MM patients were all significantly higher than those in healthy controls (P<0.05). According to the ISS staging, there were no statistically significant difference in cytokines levels of patients at each stage (P>0.05). MM patients with high CD56 expression had higher plasma levels of IL-6 than the CD56 low expression group (41.74±62.73 vs 6.31±5.60 pg/ml) (P<0.05). The plasma level of IL-6 in MM patients with high CD117 expression was higher than that in the CD56 low expression group, but there was no statistically difference (P>0.05). The plasma level of IL-6 in MM patients was significantly decreased after chemotherapy (P<0.05).

IL-6 is significantly increased in newly diagnosed MM patients, and is associated with the CD56 expression of abnormal plasma cells, which could provide important auxiliary effect on diagnosis of MM; at the same time, it is significantly decreased after chemotherapy, which may be suitable as a monitoring indicator in treatment of MM patients.