中国癌症杂志 ›› 2016, Vol. 26 ›› Issue (4): 326-332.doi: 10.3969/j.issn.1007-3969.2016.04.007

• 论著 • 上一篇    下一篇

突变特异性免疫组织化学法检测非小细胞肺癌EGFR基因突变

张龙富1,姚家美2,蒋冬先2,洪群英1,李 春1, 赵婧雅1,曾海英2,侯英勇2,张 新1   

  1. 1. 复旦大学附属中山医院呼吸科,上海 200032 ;
    2. 复旦大学附属中山医院病理科,上海 200032
  • 出版日期:2016-04-30 发布日期:2016-06-16
  • 通信作者: 张 新 E-mail: zhang.xin@zs-hospital.sh.cn

Detection of EGFR gene mutations with mutation-specific immunohistochemistry in non-small cell lung cancer

ZHANG Longfu1, YAO Jiamei2, JIANG Dongxian2, HONG Qunying1, LI Chun1, ZHAO Jingya1, ZENG Haiying2, HOU Yingyong2, ZHANG Xin1   

  1. 1.Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China; 2.Department of Pathology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
  • Published:2016-04-30 Online:2016-06-16
  • Contact: ZHANG Xin E-mail: zhang.xin@zs-hospital.sh.cn

摘要: 背景与目的:表皮生长因子受体(epidermal growth factor receptor,EGFR)基因的突变状态是非小细胞肺癌(non-small cell lung cancer,NSCLC)患者使用EGFR酪氨酸激酶抑制剂(tyrosine kinase inhibitors,TKIs)的重要疗效预测指标。该研究旨在探讨突变特异性免疫组织化学(immunohistochemistry,IHC)法检测NSCLC标本EGFR基因突变的临床实用价值。方法:同时采用突变特异性IHC法和扩增阻滞突变系统(amplification refractory mutation system,ARMS)法检测290例NSCLC患者的EGFR基因突变状态,计算突变特异性IHC法检测EGFR基因突变的灵敏度、特异度、阳性预测值(positive predictive value,PPV)和阴性预测值(negative predictive value,NPV);比较ARMS法和突变特异性IHC法检测EGFR突变的一致性。结果:以ARMS法检测结果为金标准,当染色评分≥1+为阳性时,突变特异性IHC法诊断EGFR基因突变的灵敏度为72.92%,特异度为95.20%,PPV为93.75%,NPV为78.08%。突变特异性IHC法诊断不同类型EGFR基因突变的准确性相差明显:诊断19外显子缺失突变的灵敏度只有55.55%,但其特异度在99%以上;当染色评分为1+时,诊断L858R突变的灵敏度为90.27%,特异度为95.86%,当染色评分为2+或3+时,其特异度则为98.63%~100%。突变特异性IHC法与ARMS法检测结果有较好的一致性(P<0.001,Kappa值:0.612~0.864)。突变特异性IHC法能直观判断EGFR基因突变细胞丰度。结论:突变特异性IHC法是EGFR突变分子检测的有效补充。

关键词: 非小细胞肺癌, 表皮生长因子受体, 突变, 免疫组织化学

Abstract: Background and purpose: Epidermal growth factor receptor (EGFR) gene mutation is the most important predictive factor for determining the effectiveness of EGFR tyrosine kinase inhibitors (TKIs) for non-small cell lung cancer (NSCLC). This study aimed to determine the clinical application value of mutation-specific immunohistochemistry for EGFR mutation detection in NSCLC. Methods: Mutation-specific immunohistochemistry and amplification refractory mutation system (ARMS) were used simultaneously to detect EGFR gene mutation status in 290 lung cancer specimens. The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of mutation-specific immunohistochemistry for detecting EGFR gene mutations were evaluated. The consistency was analyzed between mutation-specific immunohistochemistry results and ARMS results. Results: With ARMS testing as the gold standard, when a cutoff value of score 1+ was used as positive by immunohistochemistry, the sensitivity of mutation-specific immunohistochemistry for EGFR gene mutation was 72.92%, specificity 95.20%, positive predictive value 93.75% and negative predictive value 78.08%. The accuracy of immunohistochemistry was obviously different  when various EGFR gene mutations were detected. The sensitivity of immunohistochemistry for exon 19 deletion was only 55.55%, but specificity was above 99%. When immunohistochemistry score was 1+, the sensitivity for L858R mutation was 90.27%, whereas specificity was 95.86%. When immunohistochemistry score was 2+ or 3+, the specificity for L858R mutation was 98.63%-100%. The results of mutation-specific immunohistochemistry were finely correlated with mutation status determined by ARMS assay (P<0.001, Kappa value: 0.612-0.864). Mutation-specific immunohistochemistry can directly determine EGFR gene mutation abundance at the cellular level. Conclusion: Mutation-specific immunohistochemistry could be an effective supplemental method to EGFR molecular tests.

Key words: Non-small cell lung cancer, Epidermal growth factor receptor, Mutations, Immunohistochemistry