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Relation between transforming growth factor-β1 expression, its receptor and clinicopathological factors and survival in HER2-negative gastric cancers

Zusammenhang zwischen Transforming Growth Factor-β1 (TGF-β1) Expression und seinem Rezeptor mit klinisch-pathologischer Faktoren, beziehungsweise Überleben in HER-2-negativen Patienten mit Magenkarzinom

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Zusammenfassung

HINTERGRUND: Das Magenkarzinom ist in vielen Ländern noch immer die am häufigsten vorkommende Neoplasie. Es werden daher neben den als prognostische Marker bekannten klinisch pathologischen Faktoren, neue – davon unabhängige – Parameter untersucht. Ziel der Studie war die Untersuchung einer Expression des TGF-β1, sowie des TGF-β1-II Rezeptors (TGF-β1-RII) in HER-2-negativen Magenkarzinomen. Weiters wurde untersucht, ob eine Korrelation dieser Parameter mit klinisch-pathologischen Risiko- bzw. Prognosefaktoren des Magenkarzinoms besteht. PATIENTEN UND METHODEN: Gewebeproben von 42 Patienten, die einer kurativen Magen Resektion wegen eines Magenkarzinoms unterzogen worden waren, wurden immunhistochemisch auf das Vorliegen von HER2/neu, TGF-β1 und TGF-β1RII untersucht. Die Expression der Proteine wurde mit klinisch-pathologischen Parametern der Patienten korreliert und auf ihre prognostische Bedeutung ausgewertet. ERGEBNISSE: Alle untersuchten Proben waren HER2/neu negativ. Die Analyse des TGF-β1 ergab eine immunhistochemische Anfärbung vor allem im Zytoplasma und an der Membran. Unsere Ergebnisse zeigten, dass 80 % der intestinalen Magenkarzinom Proben eine TGF-β1 Expression aufwiesen, während das nur bei 43 % der Proben des diffusen Typs der Fall war. Auch die Tumoren mit niedriger oder mäßiger Differenzierung waren in Bezug auf TGF-βRII immunhistochemisch positiv (p = 0,041). Schließlich wurde eine mediane Überlebenszeit von 37,03 Monaten erhoben. Die Patienten mit TGF-β1 Expression hatten im Vergleich zu den Patienten, bei denen keine Expression von TGF-β1 nachgewiesen werden konnte (p = 0,034) eine schlechtere Prognose nach der chirurgischen Therapie. SCHLUSSFOLGERUNGEN: Wir konnten zeigen dass der Nachweis einer TGF-β1 Expression im Gewebe von Magen Tumoren, die einen HER2nez/negativen Status aufweisen, prognostisch ungünstig ist. Die für TGF-β1 and TGF-βRII erhobenen Ergebnisse zeigten eine Korrelation mit klinisch pathologischen Parametern. Der histologische Typ und der Differenzierungsgrad korrelierte mit dem Nachweis von TGF-β1. TGF-β1 positive Patienten hatten eine vergleichsweise kürzere Überlebenszeit als die TGF-β1 negativen Patienten.

Summary

BACKGROUND: Gastric cancer is still the most prevalent neoplasia in many countries. Therefore, besides the clinicopathological factors known to be prognostic markers, new independent parameters are being investigated. This study was to investigate the expression of transforming growth factor – β1 (TGF-β1) and transforming growth factor – β1 receptor II (TGF-β1RII) in HER2/neu negative gastric carcinomas and to explore the correlations, the clinicopathological characteristics and prognosis of gastric carcinoma. PATIENTS AND METHODS: Surgical specimens from 42 patients with gastric cancer were examined for the presence of HER2/neu, TGF-β1 and TGF-β1RII by immunohistochemistry. The correlation between expression of the proteins and patient clinicopathological parameters was evaluated and the prognostic significance of TGF-β1 and of receptor expression was assessed. RESULTS: All specimens demonstrated HER2/neu-negative status. TGF-β1 analyses exhibited predominantly cytoplasmic and membranous immunostaining. We found that 80% of intestinal gastric cancer specimens have TGF-β1 expression, while in the diffuse type they are 43%. Also the tumors with low and moderate differentiation were positive for TGF-βRII (p = 0.041). Finally we found that median survival period of the patients was 37.03 months and the patients with TGF-β1 expression had worse prognosis after surgical therapy compared to those without expression of TGF-β1 (p = 0.034). CONCLUSIONS: We have shown that TGF-β1 expression in gastric tumor tissue with HER2/neu-negative status is of prognostic relevance in gastric cancer. The data for TGF-β1 and TGF-βRII expression showed association with clinicopathological parameters, and more precisely with the differentiation and histology type and TGF-β1-positive patient had a shorter overall survival compared with TGF-β1-negative patients.

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Correspondence to Julian Ananiev.

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Ananiev, J., Gulubova, M., Tchernev, G. et al. Relation between transforming growth factor-β1 expression, its receptor and clinicopathological factors and survival in HER2-negative gastric cancers. Wien Klin Wochenschr 123, 668–673 (2011). https://doi.org/10.1007/s00508-011-0078-9

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