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。
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。
Ten newly born SD rats of clean grade were selected to isolate the brain tissue under sterile condition and clone brain-derived NSCs.
实验选取清洁级SD新生鼠10只，无菌条件下分离脑组织，克隆传代培养脑源性神经干细胞。
CD271+ MSC density was quantitated by automated image analysis of tissue microarray cores in 125 cytopenic patients: 40 lower grade MDS (<5% marrow blasts), 24 higher grade MDS, and 61 benign.
通过对125例血细胞减少症患者的组织芯片自动图像分析进行CD271+MSC密度定量检查：包括40例低级别的MDS（<5％的骨髓原始细胞），24例高级别的MDS和61例良性MDS。
The positive expression rate of CD40 in liver cancer tissue was associated with lymph node metastasis(P<0.05), but not associated with histological grade(P>0.05).
CD40在肝癌中的阳性表达与肝癌淋巴结转移有关（P＜0.05），与其分化程度无关（P＞0.05）；
The positive expression rate of CD40 in liver cancer tissue was associated with lymph node metastasis(P<0.05), but not associated with histological grade(P>0.05).
CD40在肝癌中的阳性表达与肝癌淋巴结转移有关（P＜0.05），与其分化程度无关（P＞0.05）；
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