目的 探讨非典型性脂肪瘤性肿瘤/高分化脂肪肉瘤(atypical lipomatous tumour/well-differentiated liposarcoma,ALT/WDL)中MDM2蛋白表达和基因扩增,分析MDM2蛋白表达和基因扩增在ALT/WDL中的意义.方法 采用免疫组化EliVision两步法及荧光原位杂交(fluorescence in situ hybridization,FISH)检测58例ALT/WDL中MDM2蛋白表达及基因扩增状态.结果 免疫组化检测显示58例ALT/WDL中MDM2蛋白阳性率为79.3％;FISH法检测MDM2基因扩增率为96.5％.免疫组化和FISH检测结果阳性率差异有统计学意义(P＜0.05).结论 MDM2蛋白表达和MDM2基因扩增为ALT/WDL的诊断提供依据;由于免疫组化检测阳性率接近80％,故在多数没有FISH条件的单位予以开展免疫组化MDM2蛋白检测,可以帮助诊断大多数ALT/WDL病例.%Purpose This study was to investigate the clinical significance of MDM2 protein expression and gene amplification in atypical lipomatous tumour/well-differentiated liposarcoma (ALT/WDL).Methods MDM2 protein expression and gene amplification were detected by immunohistochemistry of EliVision two-step method and fluorescence in situ hybridization (FISH) in 58 cases of ALT/WDL.Results Immunohistochemical staining showed that the positive rate of MDM2 was 79.3％,MDM2 gene amplification rate by FISH assay was 96.5％.There was statistically significant differences between immunohistochemistry and FISH (P ＜ 0.05).Conclusion MDM2 protein expression and MDM2 gene amplification provide the basis for diagnosis of ALT/WDL.However,a positive rate of MDM2 by immunohistochemistry is nearly 80％,so we recommand to carry out immunohistochemical MDM2 protein detection in most conditions without FISH which can help in the diagnosis of most cases of ALT/WDL.
展开▼
