BARD1剪切变异体的自身抗体在卵巢恶性肿瘤诊断中的临床价值

目的 评价1个新的卵巢恶性肿瘤抗原--乳腺癌易感基因1(BRCA1)相关的具有环状结构域的蛋白(BARD1)剪切变异体(OV-142)的自身抗体在卵巢恶性肿瘤诊断中的价值.方法 RT-PCR技术克隆OV-142基因的开放阅读框,构建OV-142的原核表达质粒,表达、纯化OV-142重组融合蛋白;用间接酶联免疫吸附试验检测126例卵巢恶性肿瘤患者、15例卵巢交界性肿瘤患者、42例卵巢良性肿瘤患者血清中OV-142的IgG、IgM型自身抗体的相对含量,并分析自身抗体在卵巢恶性肿瘤诊断中的临床价值.结果 成功构建了OV-142的原核表达质粒,并获得了OV-142重组融合蛋白.当联合分析OV-142 IgG型自身抗体与CA125时,在卵巢恶性肿瘤诊断中的敏感性为71.4%,高于单独分析IgG(41.3%)或CA125(61.1%);特异性为89.1%,高于单独分析IgG(84.2%)或CA125(88.0%);准确性为81.9%,高于单独分析IgG(66.8%)或CA125(77.1%).结论 OV-142是BARD1的1个剪切变异体,其有可能成为卵巢恶性肿瘤免疫治疗的新靶点.OV-142抗原的IgG型自身抗体在卵巢恶性肿瘤诊断中有可能成为CA125的1个重要的补充血清学标志物.

Clinical evaluation of autoantibody of splice variant of BARD1 in detection of ovarian cancer

Objective To investigate the value of autoantibody of breast cancer susceptibility 1 associated RING domain (BARD1) splice variant (OV-142) in detection of ovarian cancer.Methods We cloned OV-142 gene into plasmid pET-30b(+).The recombinant protein of OV-142 was expressed in pET30b(+) system and purified. The autoantibody of OV-142 was detected by indirect enzyme-linked immunosorbent assay (ELISA).Results We successfully constructed the recombinant plasmid of OV-142.The recombinant protein was expressed in pET-30b(+) system and purified.The purification rate of the recombinant protein was up to 90%.The relative amount of autoantibody of OV-142 detected by indirect ELISA was analyzed by receiver operating characteristic curve (ROC) and the cutoff value was determined.Combination of the autoantibody IgG of OV-142 and CA125 was analyzed by logistic regression. The sensitivity,specificity and accuracy was 71.4%,89.1%,and 81.9%,respectively,which were higher than IgG (41.3%,84.2%,66.8% ) and CA125( 61.1%,88.0%,77.1% ) when used alone each.Conclusions OV-142 is a splice variant of BARD1.It may be a potential immunotherapy target of ovarian cancer.Detection of autoantibody of OV-142 is a potent complementary tool of CA125 in ovarian cancerdiagnosis.