每年出版 4 期
ISSN 打印: 0731-8898
ISSN 在线: 2162-6537
Indexed in
Matrix Metalloproteinase-9 as a Potential Tumor Marker in Breast Cancer
摘要
This study aimed to detect the comparative expression and activity of matrix metalloproteinase-9 (MMP-9) and its correlation with known pathological parameters such as estrogen receptor, progesterone receptor, and human epidermal growth factor receptor 2 (HER2) in 81 malignant breast tumors and adjacent normal breast tissues and in blood sera of these patients from different clinical TNM stages (ductal carcinoma in situ to T4) of breast cancer. MMP-9 was highly expressed in node-positive tumors and the preoperative blood serum of patients, but MMP-9 activity was appreciably inhibited in blood serum samples collected after surgery. The mature form of MMP-9 (84 kD) was expressed only in clinical stage III tumors (T2−4). Appreciable reduction of tissue inhibitor of metalloproteinase 1, phosphorylation of epidermal growth factor receptor, and translocation of nuclear factor-κΒ suggested their possible role in MMP-9 activation in HER2-positive breast cancer Overexpression and activation of MMP-9 predicted a higher stage of hormone-sensitive ductal breast carcinoma. Downregulation of the endogenous inhibitor of MMP-9, tissue inhibitor of metalloproteinase 1, and translocation of the transcription factor nuclear factor-κΒ in tumors may have an appreciable role in the overexpression of MMP-9. However, MMP-9 activation was not correlated with expression of estrogen and progesterone receptors. Evaluation of MMP-9 expression may provide valuable information about breast cancer treatment.
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