YBX1 and myeloid leukemia: Especially, RNA‐binding protein, such as YBX1 that is necessary for tumour progression and metastasis (Evdokimova et al., 2009; Kwon et al., 2018), including the survival of myeloid leukaemia cells (Feng et al., 2021), is considerably upregulated on BM‐MSCs treated with MV4‐11 sEVs.