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Aims:  To investigate the immune and gastrointestinal functional effects of lienal polypeptide (LP) treatment in tumor-bearing mice and carcinoma patients receiving radiotherapy (RT), and to detect hematological indicators and T lymphocyte subsets.  Methods:  Tumor-bearing mice were randomly divided into five groups: the control group, the RT group, the RT+LP-L (1.7 mg/kg, low dosage of LP) group, the RT+LP-M (5.2 mg/kg, middle dosage of LP) group, and the RT+LP-H (10.4 mg/kg, high dosage of LP) group. In addition, carcinoma patients were randomly divided into two groups. The observation group was given LP during RT, and the control group was only treated with RT. We then compared the myelosuppression, gastrointestinal reactions, and clinical efficacy among groups.  Results:  In the animal experiments, compared with the control group, the number of leukocytes and lymphocytes of the mice in the "RT" group decreased ( p  &lt; 0.05). Animals receiving LP evidenced a dose-response curve with regard to the number of leukocytes and lymphocytes that was proportional to the LP dose, increased ( p  &lt; 0.05). Flow cytometric analyses showed that LP treatment of the mice increased the numbers of CD3 + , and CD4 + T cells and theCD4 + /CD8 + ratio. In our clinical study, the Radiation Therapy Oncology Group (RTOG)/European Organization for Research and Treatment of Cancer (EORTC) criteria were used for measuring myelosuppression and gastrointestinal reactions. The RTOG/EORTC grade 3 or 4 inhibition rate of leukocytes, granulocytes, hemoglobin, platelets, and gastrointestinal toxic effects in the observation group were significantly lower than that in the control group ( p  &lt; 0.05).  Conclusion:  LP can improve the hematopoietic and immune function of RT-treated mice and reduce the hematological and gastrointestinal toxicity of patients treated with RT and improve the quality of life.

genetic testing and molecular biomarkers

Experimental Study and Clinical Observation on the Improvement Effect of Lienal Polypeptide on Blood Toxicity and Immune Injury Induced by Radiotherapy