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Immunohistochemical evaluation of ras oncogene expression in pulmonary and pleural neoplasms

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Virchows Archiv B

Summary

We undertook an immunohistochemical analysis of human bronchopulmonary epithelial neoplasms and pleural mesotheliomas using a monoclonal antibody which recognizes ras oncogene products (p21ras). The monoclonal antibody, RAP-5, recognizes both unaltered and certain mutated p21ras. Formalin fixed and paraffin embedded tissue samples of 187 lung epithelial tumors and 27 pleural mesotheliomas were investigated; normal and bronchiectatic lungs were similarly studied. Normal lung and pleural tissue did not immunostain except for occasional type II pneumocytes. Reactive type II pneumocytes adjacent to carcinomas and bronchiectasis immunostained consistently. Twenty four/34 (71%) squamous carcinomas immunostained. Only 8/50 (16%) adenocarcinomas immunostained focally and weakly whereas 19/24 (79%) bronchioloalveolar carcinomas immunostained. Eleven/18 (61%) large cell carcinomas immunostained with variable intensity. Eleven/13 (85%) carcinoids, 6/7 (85%) well differentiated neuroendocrine carcinomas, and 18/21 (86%) intermediate cell neuroendocrine carcinomas immunostained while none of 20 small cell neuroendocrine carcinomas immunostained. Only a few mesotheliomas were immunostained focally. Two/14 (14%) epithelial type and 1/9 (11%) biphasic type mesotheliomas immunostained weakly; none of 4 spindle cell mesotheliomas immuno stained.

We conclude that while at least occasional cases of most types of pulmonary epithelial neoplasms express p21ras, the frequency and intensity of the expression are distinctly greater in certain tumor types such as squamous, bronchioloalveolar, and neuroendocrine neoplasm except for the small cell type. Contrary to these lung epithelial neoplasms, most mesotheliomas did not immunostain for p21ras. Whether the enhanced p21ras expression may point to a different mechanism of transformation or may merely reflect differentiation features remains undetermined.

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Authors and Affiliations

  1. Department of Pathology, Rush-Presbyterian-St. Luke’s Medical Center, 1753 W. Congress Parkway, 60612, Chicago, IL

    Inchul Lee & Victor E. Gould

  2. Department of Medicine, Section of Oncology, Northwestern University /VA Lakeside Medical Center, 60611, Chicago, IL

    James A. Radosevich, Yixing Ma & Steven T. Rosen

  3. Tumor Immunology and Biology Branch, National Cancer Institute, Bethesda, MD, USA

    Ann Thor & Jeffrey Schlom

Authors
  1. Inchul Lee
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  2. Victor E. Gould
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  3. James A. Radosevich
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  4. Ann Thor
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  5. Yixing Ma
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  6. Jeffrey Schlom
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  7. Steven T. Rosen
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This work was partly supported by a Veterans Administration Merit Review Grant and the Otho S. Sprague Memorial Fund

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Lee, I., Gould, V.E., Radosevich, J.A. et al. Immunohistochemical evaluation of ras oncogene expression in pulmonary and pleural neoplasms. Virchows Archiv B Cell Pathol 53, 146–152 (1987). https://doi.org/10.1007/BF02890237

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  • DOI: https://doi.org/10.1007/BF02890237

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