<p>A comparison of diagnostic panels in the immunohistochemical analysis of lung cancer</p>

Abstract

Point your SmartPhone at the code above. If you have a QR code reader the video abstract will appear. Or use: https://youtu.be/JUgBeBu__LM Purpose: Classification of non-small cell lung carcinoma (NSCLC), as adenocarcinoma or squamous cell carcinoma, is important both in the diagnosis and treatment of lung cancer. Use of appropriate markers for this identification is crucial in order to conserve patient tissue for further molecular testing that could guide treatment decisions and have prognostic implications. Patients and methods: We constructed tissue microarrays from archival resections of 200 NSCLC that were previously subtyped based on morphology and immunohistochemistry (IHC) in some cases. We performed IHC with three TTF-1 clones (SP141, SPT24 and 8G7G3/1), Napsin A, p40, p63 and CK5/6 and panels of four or two markers that best help identify adenocarcinoma and squamous cell carcinoma were ascertained. Results: Our results showed that the best four-marker panel utilized TTF-1 (clone SP141), Napsin A, p63 and CK5/6 with a sensitivity of 98.3% and high specificity of 91.7%. The best twomarker panel was TTF-1 (clone SP141) and p63 with 96.5% sensitivity and 85.71% specificity. Conclusion: As there are variations in the performance of different clones of TTF-1 IHC antibodies, the clone chosen can increase the diagnostic value in differentiating adenocarcinoma from squamous cell carcinoma. In the panels analyzed, the survival of cases concordant with the diagnosis had longer survival compared to those that were discordant. The difference was however not statistically significant (p>0.05).

Diagnostic Utility of TTF-1 and P40 Immunohistochemical Markers for Subtyping of Non-Small Cell Lung Carcinoma

“…[6] TTF-1 is a homeodomain-containing transcription factor which is predominantly found in normal type II alveolar pneumocytes that has shown high sensitivity and specificity in the immunohistochemical labelling of lung adenocarcinomas. [8] TTF-1 is a nuclear stain and has long been used to help confirm origin from a lung adenocarcinoma at metastatic sites.…”