Grade IV: The malignant tissue has cells that look most abnormal and tend to grow quickly.

第四级：有恶性组织细胞看起来最不正常的，而且往往增长迅速。

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Grade I: The tissue is benign.

级：组织是良性的。

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Objective to investigate the expressions of matrix metalloproteinase 2 (MMP 2) and tissue inhibitor of metalloproteinase 2 (TIMP 2) in astrocytoma and their relations to the pathological grade.

目的研究基质金属蛋白酶2 (MMP 2)和金属蛋白酶组织抑制剂2 (TIMP 2)在人脑星形细胞瘤中的表达及其与病理分级的关系。

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