Objective To explore the expression of Ang -2 and CD105 in breast cancer and their po-tential associations with the cancerization and progression of breast cancer .Methods Thirty patients with breast cancer ( cancerous tissue ) ,15 intraductal papilloma cases ( precancer tissue ) and 15 normal breast tissue were col-lected for each group ,respectively .Immunohistochemistry ,western blot and RT-PCR techniques were used to ex-amine the expressions of Ang -2 and CD105 in cancerous breast tissue ,precancer breast tissue and normal breast tissue at both protein and mRNA levels .The possible correlations of Ang -2 and CD105 expression with clinico-pathological characteristics of the breast cancer were analyzed .Results The expressions of CD105 and Ang-2 in cancer and precancer tissues were higher than in normal tissues at both protein and mRNA levels ,and the trend of their expressions was increased from normal to precancer ,and cancer tissue .The expressions of CD 105 and Ang-2 protein and mRNA were positively correlated with tumor size ,invasion,lymph node metastasis,and negatively correlated with the differentiation of the cancer .Conclusion CD105 and Ang-2 are involved in the canceriza-tion and pregression of breast cancer .These two biomarkers can serve as two useful indicators in assisting diagno-sis and prognosis of breast cancer .%目的：研究血管生成素-2（Ang-2）与CD105在乳腺癌中的表达以及它们与乳腺癌发生发展的关系。方法收集乳腺癌组织30例、癌前病变的乳管内乳头状瘤组织15例以及正常乳腺组织15例，采用免疫组化、Western blot和RT-PCR三种技术手段，检测Ang-2和CD105在正常乳腺组织、癌变前乳腺组织以及癌变乳腺组织中的表达情况；探讨Ang-2、CD105与乳腺癌临床病理学特征的关系。结果乳腺癌癌组织、癌变前乳腺组织中CD105和Ang-2蛋白与mRNA表达水平均比正常组织显著升高；且正常乳腺组织、癌变前乳腺组织到癌变的乳腺组织，CD105和Ang-2蛋白、mRNA水平呈逐步上升的趋势；CD105和Ang-2的蛋白与mRNA表达水平均与乳腺癌肿瘤大小、肿瘤浸润、淋巴结转移呈正相关，与乳腺癌分化程度呈负相关性。结论 CD105和Ang-2参与了乳腺癌的发生与发展，对乳腺癌的早期诊断和预后判断具有一定的临床应用价值。
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