Abstract
AIM. To study the prognostic value of the galectin-1 expression by bone marrow (BM) tumor plasma cells (PCs) and the concentration of serum cytokines (interleukins [IL-2, IL-6] and tumor necrosis factor [TNF]) in patients with monoclonal gammopathy of undetermined significance (MGUS) and multiple myeloma (ММ).
MATERIALS & METHODS. The trial enrolled 129 patients: 77 patients with newly diagnosed MM (median age 64 years) and 52 patients with MGUS (median age 62.5 years) followed-up at the Republican Scientific and Practical Center for Radiation Medicine and Human Ecology from 2018 to 2023. All patients underwent general clinical examination as well as BM aspirate cytology with myelogram and iliac BM core biopsy with immunohistochemical (IHC) analysis of BM biopsy.
RESULTS. In the BM biopsy, the IHC analysis revealed a significant increase of galectin-1 expression (measured by expressing tumor PC count) in MM vs. MGUS patients (p < 0.001). Galectin-1 expression defined as expressing tumor PC count was significantly higher in patients with progressing MGUS compared to progression-free MM patients (p < 0.001). The median galectin-1 expression level was 8.5 % (Q25 0.2 %; Q75 15.7 %) in progression-free MGUS patients and 37.4 % (Q25 24.7 %; Q75 64.0 %) in progressing MGUS patients. Among MM patients, no significant differences were identified either in those with and without tumor progression. The IHC analysis of BM core biopsies in MM patients showed that high galectin-1 expression level is associated with pronounced vasculature but not with fibrotic changes, it also identified an increase in serum concentrations of IL-2 and TNF as well as a direct correlation with β2-microglobulin level. With MGUS progression into ММ, there was a direct correlation between galectin-1 expression level and serum M-protein. An increase of IL-2 concentration was registered only when MGUS progressed into ММ.
CONCLUSION. The results of this study indicate the evidence of a high level of galectin-1 expression by tumor PCs in MM. In MGUS, an increase of galectin-1 expression by clonal BM PCs was associated with the disease progression. Galectin-1 expression by clonal BM PCs can well be clinically used as a marker for MGUS progression into MM.
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