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目的 探讨桦树皮的抗肿瘤作用和对荷瘤小鼠免疫功能的影响。方法 应用桦树皮提取物（ＥＢＢ）口服，观察体内对小鼠不同肿瘤的抑制作用。结果 ＥＢＢ可抑制小鼠Ｓ１８０肉瘤、Ｂ１６ 黑色素瘤和Ｌｅｗ ｉｓ 肺癌的生长，使瘤重量减轻，存在剂量效应关系。ＥＢＢ可使荷瘤小鼠胸腺指数脾指数增大。结论 桦树皮具有抑制肿瘤的生长、增强机体的免疫功能作用。
Objective To investigate the anti-tumor effect of birch bark and its effect on immune function of tumor-bearing mice. Methods The birch bark extract (EBB) was orally administered to observe the inhibitory effect of different in vivo tumors on mice. Results EBB inhibited the growth of S180 sarcoma, B16 melanoma and Lew is lung cancer, and reduced the tumor weight. There was a dose-effect relationship. EBB can increase the thymus index spleen index in tumor-bearing mice. Conclusion Birch bark inhibits the growth of tumors and enhances the immune function of the body.