磁共振动态增强成像对卵巢肿瘤血管生成及侵袭的诊断价值

Diagnostic value of dynamic contrast enhanced MRI in the angiogenesis and invasion of ovarian tumors

目的：探讨磁共振动态增强成像（ DCE-MRI）对卵巢肿瘤血管生成及侵袭的诊断价值。方法回顾性分析98例经手术病理证实的卵巢肿瘤患者术前且未经治疗的DCE-MEI影像资料，据药物动力学模型获得病灶的对比剂容积转移常数（ Ktrans ）、血管外细胞外间隙（ Ve）值，采用免疫组织化学检测卵巢肿瘤组织血管内皮生长因子（VEGF）、基质金属蛋白酶-2（MMP-2）表达，并对DCE-MRI参数与免疫组织化学结果进行相关性分析。结果卵巢恶性肿瘤组织中VEGF与MMP-2表达明显高于良性肿瘤（ P＜0.05）；卵巢恶性肿瘤Ktrans与Ve均值亦明显高于良性肿瘤，差异具有统计学意义（ P＜0.05）；Ktrans、Ve与VEGF、MMP-2表达均呈正相关。结论 DCE-MRI能够无创在体评价卵巢肿瘤血管生成及侵袭情况，对临床治疗及预后评估具有重要意义。

Objective To evaluate the diagnostic value of dynamic contrast enhanced MRI （DCE-MRI）in angiogenesis and invasion of ovarian tumors .Methods 98 patients with pathological-confirmed ovarian tumors without any treatment underwent plain MRI and DCE-MRI before operation .The plain MR images and DCE-MRI data were retrospectively analyzed .Value of Ktrans and Ve was detected by pharmacokinetic model .The expression of VEGF and MMP-2 in ovarian tumors was examined by immunohistochemistry .The correlation between DCE-MRI parameters and immunohistochemical results was analyzed .Results The expression of VEGF and MMP-2 was sig-nificantly higher in the malignant group compared with that in the benign group （both P〈0.05）.The value of Ktrans and Ve was significantly lower in the benign group compared with that in the malignant group （ both P〈0.05） .The value of Ktrans and Ve was positively correlated with the expression of VEGF and MMP-2.Conclusion DCE-MRI can noninvasively evaluate the angiogenesis and invasion of ovarian tumors in vivo , which has important signifi-cance for clinical treatment and prognostic assessment .