CLN3 and Miyoshi myopathy: Ueki et al reported that SL1 inhibits metastasis‐related behaviour, such as the scattering and migration of SNU‐5 cells.21 Similarly, Piater et al described a truncated version of CLN3 (CLN3‐T) that suppressed HGF‐induced migration of NCI‐H441 cells and invasion of MDA‐MB‐231 cells and inhibited c‐met phosphorylation.32 In our study, we showed that SL1 markedly inhibited the growth of c‐met‐positive MM cells, while it had no effect on B‐cells.