TNFRSF17 and Miyoshi myopathy: Although the platform we have used was not sensitive enough to detect the presence of low-level resistant cells at an early stage, our results still support a possible role for sensitive and deep sequencing of BCMA locus before CAR T-cell reinfusion or consideration of sequential BCMA-targeted therapies, to identify the outgrowth of a rare MM cell with BCMA loss.