以下为句子列表：
英文: Paragangliomas of head and neck are rare tumors that occur sporadically with the prevalence of about 1 in 30,000 of head and neck tumors.
中文: 摘要头颈部副神经节瘤是一罕见偶发的疾病，盛行率约占所有头颈部肿瘤的三万分之一。
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英文: Primary intrinsic gangliogliomas of the brainstem are exceedingly unusual.
中文: 摘要原发性脑干神经节细胞神经胶质瘤是一种非常罕见的肿瘤。
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英文: The combination of radiological findings and clinical characteristics may be helpful to diagnose retroperitoneal tumors, including paragangliomas and other neurogenic tumors and, to determine the local extent of tumor.
中文: 因此熟悉副神经节瘤的图象学表现及其可能的临床特征，将有利于后腹腔肿瘤的鉴别诊断及肿瘤局部侵犯的评估。
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英文: Method: Immunohistochemical staining method was used to study the expression of PCNA and nm23 in 47 cases of brain gliomas and 12 cases of normal brain tissues.
中文: 方法:应用免疫组织化学SP法检测47例脑胶质瘤和12例正常脑组织中PCNA和nm23的表达。
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英文: In this study, we demonstrated that expression of ephrin-A1 was dramatically down-regulated in glioma cell lines as well as in primary gliomas comparing to the matched normal tissues.
中文: 论文中对EphrinA1在神经胶质瘤中的功能作了一定的研究,同时也对食管鳞癌进行了蛋白质组分析。
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