ERBB2 and myeloid sarcoma: Logistic regression analysis was conducted to identify independent risk factors for MS.<h4>Results</h4>Serum HER2 levels were significantly higher in the MS group compared with the non-MS group (8.10 [7.10-9.10] vs. 9.25 [8.10-10.80] ng/mL, <i>p</i> < 0.001).