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Predictive impact of circulating microRNA‐193a‐5p on early relapse after autologous stem cell transplantation in patients with multiple myeloma

We explored prognostic roles of circulating microRNAs (miRs) in multiple myeloma (MM) treated with autologous stem cell transplantation (ASCT) following induction chemotherapy. In part I of the study (n = 40), we identified a decreasing dynamics of circulating miR‐193a‐5p expression from diagnosis to pre‐ASCT. In patients who experienced early relapse within one year post ASCT (n = 9) these patterns were distinctive compared to those without early relapse in a 1:2 matched cohort (n = 18). In part II (n = 90), multivariate analyses showed that the International Staging System score and miR‐193a‐5p expression before ASCT were independent prognostic factors. Conclusively, expression of circulating miR‐193a‐5p before ASCT could be a prognostic biomarker for transplant‐eligible MM.