First, we analyzed the GenomicScape database of gene expression in primary MM cells from newly‐diagnosed patients32 and found a weak (R = 0.18) but significant (p = 0.0149) correlation between the expression levels of FOS and IRF4 transcripts at levels equivalent to the correlation between IKZF1 and IRF4 (R = 0.16, p = 0.0262) (Figure 4A, upper and middle panels). Here, IKZF1 is linked to Miyoshi myopathy.