[Expression and clinical significance of MMP-2 and MMP-9 in B acute lymphoblastic leukemia].

This study was purposed to investigate the expression and clinical significance of MMP-2 and MMP-9 in patients with B-acute lymphoblastic leukemia (B-ALL). The expression of MMP-2 and MMP-9 in bone marrow mononuclear cells of B-ALL patients and normal controls was detected by RT-PCR. The gelatinolytic activity was detected by zymography. The results showed that the expression of MMP-2 in de novo and relapsed B-ALL patients was markedly higher than that in normal controls (P < 0.05). The expression of MMP-9 in de novo and relapsed B-ALL patients was markedly lower than that in normal controls (P < 0.05). The expression of MMP-2 and MMP-9 in patients with extramedullary infiltration was significantly higher than that in patients without extramedullary infiltration. The incidence of extramedullary infiltration in patients with MMP-2/MMP-9 (+) was markedly higher than that in patients with MMP-2/MMP-9 (-). The expression of MMP-9 was markedly higher in high-risk patients than that in standard-risk patients (P < 0.05), but the expression of MMP-2 had no significant difference between the high-risk and standard-risk patients (P > 0.05). It is concluded that MMP-2 and MMP-9 may be secreted by B lymphoblasts and may involve in the extramedullary infiltration. MMP-9 may correlate with poor prognosis.