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Published in: Virchows Archiv 6/2020

01-06-2020 | Metastasis | Original Article

Histopathological and molecular study for synchronous lung adenocarcinoma staging

Authors: Elsa Donfrancesco, Violaine Yvorel, François Casteillo, Marie-Laure Stachowicz, Arnaud Patoir, Olivier Tiffet, Michel Péoc’h, Fabien Forest

Published in: Virchows Archiv | Issue 6/2020

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Abstract

The presence of multiple synchronous lung cancer with the same histopathological type for a patient is a common situation and an issue for staging. Pathological criteria exist to distinguish multiple primaries from intra-pulmonary metastases of the same tumor, but they lack standardization. We wondered how molecular analysis with a limited Next Generation Sequencing panel could bring further information for tumor staging in this setting. We analyzed 24 patients with a total of 50 tumor nodules (22 pairs, two triplets). We compared histopathological examination with molecular analysis. A total of 50 tumors were molecularly tested. Nucleoli size was associated with molecular analysis concordance (p = 0.047). The presence of lepidic component in any of the two larger tumors was associated with molecular analysis concordance (p = 0.012). For molecular analysis, the proportion of progression-free patients was at the limits of significance (p = 0.054) whereas the presence of lepidic component, architectural concordance, and the concordance of comprehensive histologic assessments was not related to progression-free survival. For two patients with a discordant TTF-1 immunohistochemistry, molecular analysis showed a different mutation. Our results show that a limited NGS panel brings supplementary data to classify synchronous lung adenocarcinoma in most patients. We show that molecular staging seems in accordance with progression-free survival. Histopathological examination alone might not be accurate enough to assess a correct staging for synchronous tumors. We also suggest that TTF-1 immunohistochemistry, for the rare discrepant cases, might be a surrogate to molecular analysis.
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Metadata
Title
Histopathological and molecular study for synchronous lung adenocarcinoma staging
Authors
Elsa Donfrancesco
Violaine Yvorel
François Casteillo
Marie-Laure Stachowicz
Arnaud Patoir
Olivier Tiffet
Michel Péoc’h
Fabien Forest
Publication date
01-06-2020
Publisher
Springer Berlin Heidelberg
Keyword
Metastasis
Published in
Virchows Archiv / Issue 6/2020
Print ISSN: 0945-6317
Electronic ISSN: 1432-2307
DOI
https://doi.org/10.1007/s00428-019-02736-0

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