1. Evaluation of epidermal growth factor receptor mutations based on mutation specific immunohistochemistry in non-small cell lung cancer: A preliminary study
- Author
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Sandeep Mathur, Mehar Chand Sharma, Sobuhi Iqbal, Anant Mohan, Ritika Walia, Sunu Cyriac, Deepali Jain, Prabhat Singh Malik, Ashu Seith Bhalla, Sushmita Pathy, Randeep Guleria, Karan Madan, and Lalit Kumar
- Subjects
Adult ,Male ,0301 basic medicine ,Pathology ,medicine.medical_specialty ,Biopsy ,Concordance ,India ,lcsh:Medicine ,Lung biopsy ,Adenocarcinoma ,Biology ,General Biochemistry, Genetics and Molecular Biology ,High Resolution Melt ,03 medical and health sciences ,non-small cell lung carcinomas (NSCLC) ,0302 clinical medicine ,immunohistochemical (IHC) ,Carcinoma, Non-Small-Cell Lung ,medicine ,Carcinoma ,Humans ,Lung cancer ,Aged ,exon 21 ,mutation specific ,lcsh:R ,Exons ,Sequence Analysis, DNA ,General Medicine ,Middle Aged ,medicine.disease ,epidermal growth factor receptor (EGFR) ,ErbB Receptors ,Gene Expression Regulation, Neoplastic ,030104 developmental biology ,030220 oncology & carcinogenesis ,Mutation ,exon 19 ,Mutation (genetic algorithm) ,Immunohistochemistry ,Female ,Original Article ,Adenocarcinoma - epidermal growth factor receptor (EGFR) - exon 19 - exon 21 - immunohistochemical (IHC)- mutation specific - non-small cell lung carcinomas (NSCLC) - Abstract
Background & objectives: Studies have shown that immunohistochemical (IHC) staining using epidermal growth factor receptor (EGFR) mutation specific antibodies, is an easy and cost-effective, screening method compared with molecular techniques. The purpose of present study was to assess the percentage positivity of IHC using EGFR mutation specific antibodies in lung biopsy samples from patients with primary lung adenocarcinoma (ADC). Methods: Two hundred and six biopsies of primary lung ADC were subjected to EGFR mutation specific antibodies against del E746-A750 and L858R. Detection of EGFR mutation done by high resolution melting analysis (HRM) was used as gold standard. A concordance was established between molecular and IHC results. Frequency of IHC positivity was assessed. Results: Of the 206 patients, 129 were male and 77 were female patients, with a mean age of 54.1 yr. Fifty five (26.6%) patients (36 men; 19 women) showed positivity for IHC of del E746-A750 (33) and L858R (22). HRM results were available in 14 patients which showed EGFR mutations in correspondence with del E746-750 or L858R in 64.2 per cent cases. Positive cases on HRM were further confirmed by DNA sequencing and fragment analysis. Three patients showed exon[20] variation. Two cases were negative for mutation. The genotype of del E746-750 mutation was more common than L858R. A concordance was established between molecular mutation and IHC in 85.7 per cent cases. Interpretation & conclusions: In this preliminary study from India mutation specific IHC was used for assessment of mutation status of EGFR. Although the number tested was small, a good concordance was observed between molecular EGFR mutation and IHC expression. IHC methodology is a potentially useful tool to guide clinicians for personalized treatment in lung ADC, especially where facilities for molecular analysis are not readily available and for use in small biopsies where material is scant for molecular tests.
- Published
- 2016