ARG1 and Miyoshi myopathy: Since our previous work showed that ARG1, a transcriptional target of STAT-347,48, STAT-549 and STAT-650,51, is increased in granulocytic-like myeloid derived suppressor cells in MM28,38,52, associated to inferior outcome after bortezomib treatment28, we explored its expression in both MGUS- and MM-HDNs.