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TTF1 expression in normal lung neuroendocrine cells and related tumors: immunohistochemical study comparing two different monoclonal antibodies

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Abstract

Thyroid transcription factor-1 (TTF1) regulates lung morphogenesis and differentiation, and its immunohistochemical expression is used for identifying lung neoplasms. The 8G7G3/1 antibody has been used in previous studies, but a different and more sensitive anti-TTF1 antibody, named SPT24, has become commercially available. Since the immunohistochemical expression of TTF1 in normal lung neuroendocrine (NE) cells has not been previously investigated and its utility in the diagnosis of lung NE tumors is a controversial issue, we studied the TTF1 expression in normal adult and fetal lungs, in 83 pulmonary NE neoplasms, in 131 non-lung NE tumors and in 36 metastases from these neoplasms using these two antibodies. A TTF1 immunoreactivity was demonstrated in normal fetal and adult NE cells when using the SPT24 clone. Conversely, using the 8G7G3/1 antibody, only rare fetal neuroendocrine cells were TTF1 positive while adult NE cells were negative. The SPT24 clone identified TTF1 expression in more carcinoids, most of them peripherally located, and poorly differentiated NE carcinomas than the 8G7G3/1 clone. Non-pulmonary well-differentiated NE tumors were negative for both antibodies. Among the 45 non-pulmonary poorly differentiated NE carcinomas 11% were positive for 8G7G3/1 and 18% for SPT24. TTF1 expression in metastases perfectly reflected that detected in the related primary tumors. Our results indicate that the SPT24 antibody is more sensitive than the 8G7G3/1 clone for labeling lung carcinoids and it appears particularly useful in detecting peripheral neoplasms. In addition, the expression of TTF1 in normal NE cells suggests a possible role for the transcription factor in their development and differentiation.

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Acknowledgments

This study was supported in part by a grant from the University of Insubria, Varese.

Conflict of interest statement

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Department of Pathology, Ospedale di Circolo, Viale Borri 57, 21100, Varese, Italy

    Stefano La Rosa, Anna Maria Chiaravalli, Michele Cerati & Carlo Capella

  2. Department of Human Morphology, University of Insubria, Varese, Italy

    Claudia Placidi, Nikolaos Papanikolaou & Carlo Capella

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  1. Stefano La Rosa
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  2. Anna Maria Chiaravalli
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  5. Michele Cerati
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Correspondence to Stefano La Rosa.

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La Rosa, S., Chiaravalli, A.M., Placidi, C. et al. TTF1 expression in normal lung neuroendocrine cells and related tumors: immunohistochemical study comparing two different monoclonal antibodies. Virchows Arch 457, 497–507 (2010). https://doi.org/10.1007/s00428-010-0954-0

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  • DOI: https://doi.org/10.1007/s00428-010-0954-0

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