After completion of chemiluminescent signal measurements and statistical analysis, 6 proteins were identified as having at least 1.5‐fold change in expression in MPN patients versus controls: angiopoietin‐1, Dkk‐1, EGF (epidermal growth factor), I‐TAC (interferon‐inducible T cell alpha chemoattractant, CXCL11), PDGF‐AA and PDGF‐AB/BB (Figure 1B). This evidence concerns the gene DKK1 and myeloproliferative disorder.