SOX4 and myeloid sarcoma: Our comparison of gene expression patterns within the non‐MS patient subset identified seven genes differentially expressed between DSG2‐high and DSG2‐low patient subsets, and two of these are transcription factors that have been associated with either pluripotent stem cells (SOX2) [62] or haematopoietic stem/progenitor cells (SOX4) [63, 64].