Abstract: ObjectiveTo discuss the relationship among hypoxiainducible factor1α (HIF1α), platelet derived growth factor (PDGF) and vascular endothelial growth factor (VEGF)/VEGFR signaling pathway in breast cancer occurring and metastasis in the early stage. MethodsThe clinical and pathological features and the expression of HIF1α, PDGFA, VEGFA and VEGFR2 were assayed by histomorphology and immunohistochemical staining on tissue specimens from 61 patients of breast cancer and healthy breast tissues healthy breast tissue from 17 patients of benign breast disease. ResultsVEGF expression was observed in 39 out of 61 malignant breast tissues, more than distribution of positive staining 20 patients (51.3%) of which. VEGFR expression was found in 42 out of 61 lesions,. more than 10% distribution of positive staining 22 patients (52.4%) of which. Simultaneous expression of VEGF and VEGFR2 was found in 12 cases. HIF1α was expressed in 50 and PDGF in 39 out of 61 breast cancer patients, and in 36(72.0%) HIF1α positive specimens and 23 (59.0%) PDGF positive specimens the staining area was more than 10%. The expression of VEGFR was  correlated with patient′s age （χ2=11.080, P=0.001）and lymph node metastasis （χ2=4.699, P=0.046）. VEGF, HIF1α and PDGF were not correlated with patient′s age (χ2=0.880,  P=0.415; χ2=1.620, P=0.303; χ2=0.150, P=0.786) and lymph node metastasis （χ2=0.677, P=0.437; χ2=1.394, P=0.323; χ2=1.841, P=0.192）. ConclusionHIF1α, PDGF, VEGF and VEGFR2 express in breast tumor tissues at a high level, and VEGFR2 is correlated with patient′s age and lymph node metastasis. Abovementioned proteins can be used as markers for diagnosis, prognosis and targeted therapy.

Key words: Breast neoplasms, Hypoxiainducible factor 1, alpha subunit, Vascular endothelial growth factors, Platelet derived growth factor