CD274 and Miyoshi myopathy: To our knowledge, miRNAs involved in regulation of PD-L1 in MM have yet to be described; however, considering the overlap with some miRNAs known to be involved in MM, such as the miR-15 family, the miR17~ 92 cluster, miR-21, miR-34a, or miR-106b [118, 119], it stands to reason that some miRNAs regulating PD-L1 expression could be involved in MM.