Regarding the regulation of CYP27B1 expression (genes METTL21B, METTL1, FGF23, and PTH), which is thought to influence VDR (Bouksila et al., 2018), METTL21B variant rs141172155 was observed only in two patients with MS from type‐B families. The gene discussed is FGF23; the disease is myeloid sarcoma.