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CC BY-NC-ND 4.0 · South Asian J Cancer 2019; 08(03): 191-194
DOI: 10.4103/sajc.sajc_163_18
ORIGINAL ARTICLE: Lung Cancers

Application of International association for the study of lung cancer/American Thoracic Society/European Respiratory Society criteria for the diagnosis of lung carcinomas on small biopsies: A tertiary care center experience

K. V. Vinu Balraam
Department of Clinical Research, ICMR - National Institute for Research in Reproductive Health, Mumbai
,
Divya Shelly
Department of Clinical Research, ICMR - National Institute for Research in Reproductive Health, Mumbai
,
Prabha S. Mishra
Department of Health Research, Model Rural Health Research Unit Dahanu, Sub District Hospital, Dahanu, Maharashtra
,
K. S. Sampath
Department of Clinical Research, ICMR - National Institute for Research in Reproductive Health, Mumbai
,
Reena Bharadwaj
Department of Clinical Research, ICMR - National Institute for Research in Reproductive Health, Mumbai
› Institutsangaben Financial support and sponsorship Nil.
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Abstract

Background: The new IASLC/ATS/ERS classification provides standardized terminology for lung cancer diagnosis in small biopsies and cytology specimens. Objectives: The aim was to study the feasibility of the guidelines using one marker for adenocarcinoma (ADC) and one for squamous cell carcinoma (SQCC) in non-small cell lung carcinomas (NSCLCs). Subject and Methods: In this study, we reviewed all the formalin-fixed paraffin-embedded tissue blocks diagnosed as lung carcinoma between July 2016 and December 2017. Cases were labeled as SCLC, ADC, SQCC, NSCLC favor ADC, NSCLC favor SQCC, NSCLC-not otherwise specified (NOS), and NSCLC-NOS possible adeno-SQCC (ADSQCC) as per IASLC/ATS/ERS 2011 guidelines. A three-step approach incorporating morphology, immunohistochemistry (IHC), and molecular analysis was used. Results: One hundred and nine cases were included. Six of the 109 cases were SCLC and 1 case was of large-cell neuroendocrine type. Of the remaining 102, 51 were diagnosed based on their classical histomorphology into SQCC (8) and ADC (43). Remaining 51 cases required IHC/special stains for categorization. The panel comprised anti-CK7, anti-thyroid transcription factor-1 (TTF-1), and anti-p63. Twenty-nine were positive for anti-TTF-1 and thus labeled as NSCLC favor ADC. Fifteen were labeled as NSCLC favor SQCC as they were highlighted by anti-p63. Four cases showed reaction to both the antibodies in different sets of tumor cells and thus were classified as NSCLC-NOS, possible ADSQCC. Remaining 3 cases did not show reaction to any of the antibodies and hence were labeled NSCLC-NOS. Conclusion: The need for every laboratory to use minimal tissue for ancillary tests to diagnose lung carcinoma on small biopsies is reemphasized. Tissue from small biopsies needs to be preserved not only for the diagnosis but also for molecular testing and evaluation of markers of resistance to therapy, in this era of personalized medicine.

Key words

IASLC/ATS/ERS guidelines - lung cancer - nomenclature - small biopsies - three-step approach


Publikationsverlauf

Artikel online veröffentlicht:
21. Dezember 2020

© 2019. MedIntel Services Pvt Ltd. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/.)

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