SMARCA4 and SMARCA2 deficiency in non-small cell lung cancer: immunohistochemical survey of 316 consecutive specimens
The chromatin remodeling switch sucrose nonfermentable (SWI/SNF) complex has been increasingly implicated in the pathogenesis and dedifferentiation of neoplasms from several organs with prognostic and potential therapeutic implications. We herein investigated the expression of the SWI/SNF complex ca...
Gespeichert in:
| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2017
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| In: |
Annals of diagnostic pathology
Year: 2016, Jahrgang: 26, Pages: 47-51 |
| ISSN: | 1532-8198 |
| DOI: | 10.1016/j.anndiagpath.2016.10.006 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1016/j.anndiagpath.2016.10.006 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S1092913416302738 
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| Verfasserangaben: | Esther Herpel, MD, Ralf J. Rieker, MD, Hendrik Dienemann, MD, Thomas Muley, PhD, Michael Meister, PhD, Arndt Hartmann, MD, Arne Warth, MD, Abbas Agaimy, MD |
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| 245 | 1 | 0 | |a SMARCA4 and SMARCA2 deficiency in non-small cell lung cancer |b immunohistochemical survey of 316 consecutive specimens |c Esther Herpel, MD, Ralf J. Rieker, MD, Hendrik Dienemann, MD, Thomas Muley, PhD, Michael Meister, PhD, Arndt Hartmann, MD, Arne Warth, MD, Abbas Agaimy, MD |
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| 520 | |a The chromatin remodeling switch sucrose nonfermentable (SWI/SNF) complex has been increasingly implicated in the pathogenesis and dedifferentiation of neoplasms from several organs with prognostic and potential therapeutic implications. We herein investigated the expression of the SWI/SNF complex catalytic subunits SMARCA4 (BRG1) and SMARCA2 (BRM) in 316 consecutive non-small cell lung cancer (NSCLC) specimens on tissue microarrays (171 adenocarcinomas [ADCAs], 130 squamous cell carcinomas [SCCs], 9 adenosquamous carcinomas, and 6 large cell carcinomas) excluding undifferentiated/giant cell or rhabdoid carcinomas. Complete loss of SMARCA4 was observed in 8 (5.5%) of 146 evaluable pulmonary ADCAs and 6 (5.2%) of 115 evaluable pulmonary SCCs, whereas 9 (6.4%) of 140 ADCAs and 2 (1.7%) of 117 SCCs showed SMARCA2 loss. Two of 6 large cell carcinomas were SMARCA2 deficient. Concurrent loss of both markers was observed in 4 cases (2 ADCAs and 2 SCCs). Of 15 ADCAs with loss of either or both markers, 12 (80%) were TTF1 negative. In conclusion, SMARCA4 and SMARCA2 deficiency is observed in 5.1% and 4.8% of NSCLC, respectively. SMARCB1 expression was intact in all cases. The presence of differentiated histology (glandular or squamous) is a novel aspect among SWI/SNF-deficient carcinomas which in other organs generally are associated with undifferentiated/rhabdoid morphology. The predominance of TTF1 negativity among SWI/SNF-deficient pulmonary ADCA (80%) underlines the need to include these 2 markers in the evaluation of TTF1-negative ADCA of putative pulmonary origin. Given the recently documented potential of SMARCA4 loss as a predictor of chemosensitivity to platinum-based chemotherapy in NSCLC, recognition of the clinicopathological features of SMARCA4-deficient NSCLC in routine surgical pathology practice is recommended. | ||
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| 650 | 4 | |a Adenocarcinoma | |
| 650 | 4 | |a NSCLC | |
| 650 | 4 | |a SMARCA2 | |
| 650 | 4 | |a SMARCA4 | |
| 650 | 4 | |a Squamous cell carcinoma | |
| 650 | 4 | |a SWI/SNF complex | |
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