Reliable entity subtyping in non-small cell lung cancer by matrix-assisted laser desorption/ionization imaging mass spectrometry on formalin-fixed paraffin-embedded tissue specimens
Histopathological subtyping of non-small cell lung cancer (NSCLC) into adenocarcinoma (ADC), and squamous cell carcinoma (SqCC) is of utmost relevance for treatment stratification. However, current immunohistochemistry (IHC) based typing approaches on biopsies are imperfect, therefore novel analytic...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
29 July 2016
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| In: |
Molecular & cellular proteomics
Year: 2016, Jahrgang: 15, Heft: 10, Pages: 3081-3089 |
| ISSN: | 1535-9484 |
| DOI: | 10.1074/mcp.M115.057513 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1074/mcp.M115.057513 Verlag, kostenfrei, Volltext: http://www.mcponline.org/content/15/10/3081 
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| Verfasserangaben: | Mark Kriegsmann, Rita Casadonte, Jörg Kriegsmann, Hendrik Dienemann, Peter Schirmacher, Jan Hendrik Kobarg, Kristina Schwamborn, Albrecht Stenzinger, Arne Warth, and Wilko Weichert |
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| 245 | 1 | 0 | |a Reliable entity subtyping in non-small cell lung cancer by matrix-assisted laser desorption/ionization imaging mass spectrometry on formalin-fixed paraffin-embedded tissue specimens |c Mark Kriegsmann, Rita Casadonte, Jörg Kriegsmann, Hendrik Dienemann, Peter Schirmacher, Jan Hendrik Kobarg, Kristina Schwamborn, Albrecht Stenzinger, Arne Warth, and Wilko Weichert |
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| 520 | |a Histopathological subtyping of non-small cell lung cancer (NSCLC) into adenocarcinoma (ADC), and squamous cell carcinoma (SqCC) is of utmost relevance for treatment stratification. However, current immunohistochemistry (IHC) based typing approaches on biopsies are imperfect, therefore novel analytical methods for reliable subtyping are needed. We analyzed formalin-fixed paraffin-embedded tissue cores of NSCLC by Matrix-assisted laser desorption/ionization (MALDI) imaging on tissue microarrays to identify and validate discriminating MALDI imaging profiles for NSCLC subtyping. 110 ADC and 98 SqCC were used to train a Linear Discriminant Analysis (LDA) model. Results were validated on a separate set of 58 ADC and 60 SqCC. Selected differentially expressed proteins were identified by tandem mass spectrometry and validated by IHC. The LDA classification model incorporated 339 m/z values. In the validation cohort, in 117 cases (99.1%) MALDI classification on tissue cores was in accordance with the pathological diagnosis made on resection specimen. Overall, three cases in the combined cohorts were discordant, after reevaluation two were initially misclassified by pathology whereas one was classified incorrectly by MALDI. Identification of differentially expressed peptides detected well-known IHC discriminators (CK5, CK7), but also less well known differentially expressed proteins (CK15, HSP27). In conclusion, MALDI imaging on NSCLC tissue cores as small biopsy equivalents is capable to discriminate lung ADC and SqCC with a very high accuracy. In addition, replacing multislide IHC by an one-slide MALDI approach may also save tissue for subsequent predictive molecular testing. We therefore advocate to pursue routine diagnostic implementation strategies for MALDI imaging in solid tumor typing. | ||
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