Abstract
Background
Human epidermal growth factor receptor 2 (ErbB2) is overexpressed in a variety of human malignancies. Moreover, ErbB2 has been reported to influence cancer patient survival and progression of different tumor entities. However, information regarding the prognostic impact of ErbB2 in soft tissue sarcoma (STS) patients is limited and conflicting.
Material and methods
ErbB2 mRNA and protein levels were defined by quantitative real-time PCR and enzyme-linked immunosorbent assay (ELISA), and the prognostic impact of ErbB2 mRNA and protein levels in tumor tissue of 124 soft tissue sarcoma patients were investigated.
Results
The median ErbB2 mRNA expression level in tumor tissue was decreased 3.9-fold compared to non-neoplastic surrounding tissue (p = 0.001). Furthermore, an increased ErbB2 mRNA expression level was associated with an improved tumor-specific survival (p = 0.01, log rank test). Multivariate Cox’s proportional hazard regression analyses revealed an increased ErbB2 mRNA expression level as an independent favorable prognostic factor for tumor-specific survival of STS patients (n = 124; RR = 3.0; 95 % CI = 1.6–5.7; p < 0.001). In addition, multivariate Cox’s proportional hazard regression analyses showed that an increased ErbB2 protein expression level correlated with poorer recurrence-free survival of STS patients (n = 47; RR = 9.9; 95 % CI = 1.7–59.7; p = 0.012), in particular for STS patients who received postoperative radiotherapy (n = 27; RR = 17.9; 95 % CI = 1.3–247.7; p = 0.031).
Conclusion
This study suggests an inverse prognostic value of ErbB2 mRNA and protein expression level.
Zusammenfassung
Hintergrund
Der epidermale Wachstumsfaktorrezeptor (ErbB2) wird in einer Vielzahl von humanen Malignitäten überexprimiert. Darüber hinaus beeinflusst ErbB2 das Überleben von Tumorpatienten und die Progression verschiedener Tumorentitäten. Allerdings stehen nur begrenzte und widersprüchliche Daten zur prognostischen Bedeutung des ErbB2 in Weichteilsarkompatienten zur Verfügung.
Material und Methoden
Der ErbB2-mRNA- und Proteingehalt von 124 Weichteilsarkomen wurde mittels quantitativer Real-Time-PCR und „Enzyme Linked Immunosorbent Assay“ (ELISA) bestimmt und deren Einfluss auf das Überleben der Weichteilsarkompatienten untersucht.
Ergebnisse
Der mediane ErbB2-mRNA-Gehalt im Tumorgewebe war im Vergleich zum angrenzenden Normalgewebe 3,9-fach geringer (p = 0,001). Darüber hinaus war ein erhöhter ErbB2-mRNA-Gehalt mit einem besseren tumorspezifischen Überleben assoziiert (p = 0,01; Log-rank-Test). In multivariaten Cox-Regressionsanalysen erwies sich der ErbB2-mRNA-Gehalt als unabhängiger prognostischer Marker für das Überleben von Weichteilsarkompatienten (n = 124; RR = 3,0; 95 %-KI 1,6–5,7; p < 0,001). Multivariate Cox-Regressionsanalysen zeigen darüber hinaus, dass ein erhöhter ErbB2-Proteingehalt mit einem schlechten rezidivfreien Überleben von Weichteilsarkompatienten (n = 47; RR = 9,9; 95 %-KI 1,7–59,7; p = 0,012) und insbesondere mit einem schlechteren rezidivfreien Überleben von Weichteilsarkompatienten nach postoperativer Radiotherapie korreliert ist (n = 27; RR = 17,9; 95 %-KI 1,3–247,7; p = 0,031).
Schlussfolgerung
Diese Studie legt eine inverse prognostische Bedeutung des mRNA- und Proteingehalts von ErbB2 für Patienten mit Weichteilsarkomen nahe.
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Acknowledgments
We thank our colleagues from the Department of Radiotherapy and Department of Oral and Maxillofacial Plastic Surgery for contributing to this study and for their continuous support. We also thank Gabriele Thomas and Kathrin Spröte for their excellent technical assistance. ELISA Kits to quantify ErbB2 protein levels were kindly supported by Wilex Inc., Cambridge, MA, USA.
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Matthias Kappler and Dirk Vordermark contributed equally to this article.
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Wichmann, H., Güttler, A., Bache, M. et al. Inverse prognostic impact of ErbB2 mRNA and protein expression level in tumors of soft tissue sarcoma patients. Strahlenther Onkol 190, 912–918 (2014). https://doi.org/10.1007/s00066-014-0655-8
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DOI: https://doi.org/10.1007/s00066-014-0655-8