BM biopsies from 26 BCP-ALL patients were collected. The BM biopsies from 15 patients who presented with unexplained thrombocytosis or anemia but with no hematologic malignancy or an autoimmune disease found during diagnostic procedure and follow-up were collected as the controls. This study was approved by the ethics committee of the First Affiliated Hospital of Zhengzhou University (No. 2019-KY-194). Each subject signed an informed consent form.
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