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Print ISSN:-2394-6784

Online ISSN:-2394-6792

CODEN : IJPOF3

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Year 2020

Volume: 7 , Issue: 2

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Indian Journal of Pathology and Oncology


Conflicting immunohistochemistry and metabolic imaging parameters in adenocarcinoma lung showing elevated serum CA 19-9 with immunonegative TTF1 and Napsin A


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Author Details : Sweta Sinha*, Vijaya Aditya Yadaraju, Praveen Adusumilli, Muralidhar Bora, Vatturi Venkata Satya

Volume : 7, Issue : 1, Year : 2020

Article Page : 186-190


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Abstract

Lung carcinoma is the most common and lethal malignancy in men. Non-small cell lung carcinoma is more
aggressive than small cell lung carcinoma and often presents in advanced stage with metastasis. Cytology,
histopathology, immunohistochemistry and metabolic imaging play an important role in classifying lung
carcinomas. TTF 1 and Napsin A are highly sensitive and specific for adenocarcinoma lung, but the
sensitivity and specificity decreases in high grade tumours. Elevated serum CA 19-9 tumour marker is
not always related to pancreatico-biliary adenocarcinomas. It can be positive in adenocarcinoma lung and
its elevation confers poor prognosis. Quintessential role of metabolic imaging like 18F-FDG PET CT scan
in high grade carcinomas is well known. With the advent of targeted therapy, molecular and receptor studies
of EGFR, ROS 1 and ALK gene rearrangement becomes mandatory in all lung adenocarcinomas. Hence,
both oncologist and pathologist should diagnose advanced stage tumours without bias with good clinical,
radiological and pathological correlation.

Keywords: Lung adenocarcinoma, Immunohistochemistry, CA 19-9, TTF1, Napsin A, Metabolic imaging.

Doi : 10.18231/j.ijpo.2020.035

How to cite : Sinha S, Yadaraju V A, Adusumilli P, Bora M, Satya V V, Conflicting immunohistochemistry and metabolic imaging parameters in adenocarcinoma lung showing elevated serum CA 19-9 with immunonegative TTF1 and Napsin A. Indian J Pathol Oncol 2020;7(1):186-190

Copyright © 2020 by author(s) and Indian J Pathol Oncol. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC-BY-NC 4.0) (creativecommons.org)