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What’s new in the WHO classification of tumors of lung and pleura
Abstract
The World Health Organization (WHO) tumor classification fascicles (so-called Blue books) are periodically updated in light of significant changes in the understanding of new tumor entities identification, tumor prognosis and innovation of immunohistochemical stains and/or molecular biology of tumors. Information on pathologic and genetic classification and grading of tumors are used worldwide and the WHO Classification of Tumours of the Lung, Pleura, Thymus and Heart was updated in 2015 1. In this monographic issue of Pathologica, expert pathologists of the Pleuro-Pulmonary Pathology Group (GIPP) have selected important topics of pleuro-pulmonary pathologies to review and discuss based on the news contained in the new 2015 Blue book.
Full text
The World Health Organization (WHO) tumor classification fascicles (so-called Blue books) are periodically updated in light of significant changes in the understanding of new tumor entities identification, tumor prognosis and innovation of immunohistochemical stains and/or molecular biology of tumors. Information on pathologic and genetic classification and grading of tumors are used worldwide and the WHO Classification of Tumours of the Lung, Pleura, Thymus and Heart was updated in 2015 1. In this monographic issue of Pathologica, expert pathologists of the Pleuro-Pulmonary Pathology Group (GIPP) have selected important topics of pleuro-pulmonary pathologies to review and discuss based on the news contained in the new 2015 Blue book.
In particular, Kuhn and colleagues 2 have critically reviewed the new classification of pulmonary adenocarcinoma, the neoplasm becoming the most common lung tumor accounting for more than 50% of all pulmonary malignancies 3. The authors also illustrated the morphologic criteria in the differential diagnosis between reactive and neoplastic glandular proliferations as well as the role of immunostains in defining unusual variants of adenocarcinoma and in discriminating primary versus metastatic adenocarcinomas.
Ascoli and collaborators 4 reviewed the diagnostic, prognostic and predictive features of pleural mesothelioma. The authors discussed the use of ancillary techniques in the differential diagnosis of reactive and malignant mesothelial growths, the possibilities in diagnosing mesothelioma on cytology based on new international guidelines and novel findings of molecular biology of familial and sporadic mesotheliomas 5-8.
Since the identification of epidermal growth factor receptor (EGFR) mutations in lung adenocarcinoma in 2004 and the other targetable oncogenes (e.g., ALK, BRAF, ROS1), the role of pathologists in the choice of therapeutic strategies in lung cancer has radically changed 9 10. Barbareschi and co-authors 11 have analyzed the use of various tumor tissue (cytology and histology), including the advent of liquid biopsy, to determine present and future predictive biomarkers and the new methodologies that presumably will characterize the future laboratory of predictive molecular biology.
Finally, Mengoli and co-workers 12 introduced the clinic-pathologic and immunohistochemical and molecular characteristics of the new tumor entities that have been included into the 2015 WHO classification of lung tumors, then detailing on myxoid sarcoma, PEComa, carcinoma with NUT translocation (NUT-carcinoma), myoepithelial tumor/carcinoma, angiomatoid fibrous histiocytoma, pneumocytic adenomyoepithelioma and ciliated muconodular papillary tumor.
As highlighted from the contributions of the colleagues here, the new WHO classification has changed several aspects of the pathologists’ routine practice and represents a modern integrated clinical, radiologic, and molecular approach to dealt with thoracic cancer.
We are entirely sure that the contributions included here will enjoy the readers in increasing the knowledge of several features of neoplastic thoracic pathology.
References
- WHO classification of tumours of the lung, pleura, thymus and heart. IARC Press: Lyon (France); 2015.
- Kuhn E, Morbini P, Cancellieri A. Adenocarcinoma classification: patterns and prognosis. Pathologica. 2018; 110:5-11.
- Travis WD, Brambilla E, Noguchi M. International association for the study of lung cancer/American thoracic society/European respiratory society international multidisciplinary classification of lung adenocarcinoma. J Thorac Oncol. 2011; 6:244-85.
- Ascoli V, Murer B, Nottegar A. What’s new in mesothelioma. Pathologica. 2018; 110:12-28.
- Husain AN, Colby T, Ordonez N. Guidelines for pathologic diagnosis of malignant mesothelioma: 2012 update of the consensus statement from the International Mesothelioma Interest Group. Arch Pathol Lab Med. 2013; 137:647-67.
- Novello S, Pinto C, Torri V. The third italian consensus conference for malignant pleural mesothelioma: state of the art and recommendations. Crit Rev Oncol Hematol. 2016; 104:9-20.
- Hjerpe A, Ascoli V, Bedrossian CW. Guidelines for the cytopathologic diagnosis of epithelioid and mixed-type malignant mesothelioma: complementary statement from the International Mesothelioma Interest Group, also endorsed by the International Academy of Cytology and the Papanicolaou Society of Cytopathology. Diagn Cytopathol. 2015; 43:56.
- Churg A, Sheffield BS, Galateau-Salle F.. New markers for separating benign from malignant mesothelial proliferations: are we there yet?. Arch Pathol Lab Med. 2016; 140:318-21.
- Kris MG, Johnson BE, Berry LDn. Using molecular multiplexed assays of oncogenic drivers in lung cancer to select targeted drugs. JAMA. 2014; 311:1998-2006.
- Kerr KM, Bubendorf L, Edelman MJ. Second ESMO consensus conference on lung cancer: pathology and molecular biomarkers for non-small-cell lung cancer. Ann Oncol. 2014; 25:1681-90.
- Barbareschi M, Barberis M, Buttitta F. Predictive markers in lung cancer: a few hints for the practicing pathologist. Pathologica. 2018; 110:29-38.
- Mengoli MC, Longo FR, Fraggetta F. The 2015 World Health Organization Classification of Lung Tumors: new entities since the 2004 Classification. Pathologica. 2018; 110:39-67.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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© Copyright by Società Italiana di Anatomia Patologica e Citopatologia Diagnostica, Divisione Italiana della International Academy of Pathology , 2018
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