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近来肿瘤研究的进展揭示了肿瘤发生是一系列控制细胞生长和分化的癌基因和抑癌基因异常改变积累作用的结果[1]。大量资料表明ras基因是人类多种肿瘤最常见的异常基因之一,ras基因突变、过量表达被认为是肿瘤发生的重要原因。我们应用聚合酶链技术(PCR)对5...
Recent advances in cancer research have revealed that tumorigenesis is the result of a series of abnormal accumulation of oncogenes and tumor suppressor genes that control cell growth and differentiation [1]. A large number of data indicate that ras gene is one of the most common abnormal genes in many kinds of human tumors. The ras gene mutation and overexpression are considered to be important causes of tumorigenesis. We apply polymerase chain technology (PCR) to 5...