CD274 and Miyoshi myopathy: However, PD-L1 expression was significantly higher on MM cells from daratumumab-naïve RRMM patients (median MFI 1030, p = 0.016) and daratumumab-refractory MM patients (median MFI 918, p = 0.030), when compared to normal PCs, or when compared to NDMM (p < 0.001 for both daratumumab-naïve and daratumumab-refractory RRMM).