Clinical Study on the Safety and Efficacy of Umbilical Cord Blood Infusion in Treating Bone Marrow Suppression .

Inclusion Criteria: * 1\) Ages 60-80 years , gender unlimited; * 2\) Patients clinically diagnosed with MDS or AML; * 3\) Completed chemotherapy and clinically diagnosed with bone marrow suppression grade 2 or above; * 4\) Patients with no severe impairment of liver and kidney function (total bilirubin (TBIL): ≤ 1.5×ULN; ALT or AST: ≤ 2.5×ULN; Alkaline phosphatase: ≤ 3×ULN; Serum creatinine: ≤ 1.5×ULN); * 5\) Normal cardiac function; * 6\) Patients with ECOG 0-2; * 7\) Patients or their families have been informed and voluntarily signed a written informed consent form. Exclusion Criteria: * 1\) Other factors that may cause abnormalities in white blood cells and neutrophils, such as concurrent infections, invasive procedures, etc. * 2)Presence of interstitial lung disease, non-infectious pneumonia, or uncontrolled systemic diseases (such as diabetes, hypertension, pulmonary fibrosis, and acute pneumonia, etc.). Any unstable systemic diseases: including but not limited to unstable angina, cerebrovascular accident or transient ischemic attack (within 6 months prior to screening), myocardial infarction (within 6 months prior to screening), congestive heart failure (New York Heart Association NYHA classification ≥ III,), severe arrhythmias requiring medication, liver, kidney, or metabolic diseases. * 3\) Any other uncontrolled active diseases that may interfere with participation in the trial; * 4\) Concurrent diagnosis of malignant tumors in other organs; * 5\) Concurrent diagnosis of other hematological disorders; * 6\) Inability to understand or comply with the study protocol; * 7\) Individuals deemed unsuitable for participation in this trial by the investigator.