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Article Open Access

Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients

  • Authors:
    • Julieta Afonso
    • Adhemar Longatto-Filho
    • Vitor  Moreira Da Silva
    • Teresina Amaro
    • Lúcio L. Santos
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    Affiliations: Life and Health Sciences Research Institute (ICVS), School of Healh Sciences (ECS) University of Minho, Braga 4710-057, Portugal, Department of Urology, Portuguese Institute of Oncology (IPO), Porto 4200-072, Portugal, Experimental Pathology and Therapeutics Research Center, Portuguese Institute of Oncology (IPO), Porto 4200-072, Portugal, Department of Surgical Oncology, Portuguese Institute of Oncology (IPO), Porto 4200-072, Portugal
  • Pages: 1447-1454
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    Published online on: July 30, 2014
       https://doi.org/10.3892/ol.2014.2392
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Abstract

Urothelial bladder carcinoma (UBC) is heterogeneous in its pathology and clinical behaviour. Evaluation of prognostic and predictive biomarkers is necessary, in order to produce personalised treatment options. The present study used immunohistochemistry to evaluate UBC sections containing tumour and non‑tumour areas from 76 patients, for the detection of p‑mTOR, CD31 and D2‑40 (blood and lymphatic vessels identification, respectively). Of the non‑tumour and tumour sections, 36 and 20% were scored positive for p‑mTOR expression, respectively. Immunoexpression was observed in umbrella cells from non‑tumour urothelium, in all cell layers from non‑muscle‑invasive (NMI) tumours (including expression in superficial cells), and in spots of cells from muscle‑invasive (MI) tumours. Positive expression decreased from non‑tumour to tumour urothelium, and from pT1/pTis to pT3/pT4 tumours; however, the few pT3/pT4 positive cases had worse survival rates, with 5‑year disease‑free survival being significantly lower. Angiogenesis occurrence was impaired in pT3/pT4 tumours that did not express p‑mTOR. In conclusion, p‑mTOR expression in non‑tumour umbrella cells is likely a reflection of their metabolic plasticity, and extension to the inner layers of the urothelium in NMI tumours is consistent with an enhanced malignant potential. The expression in cell spots in a few MI tumours and absence of expression in the remaining tumours is intriguing and requires further research. Additional studies regarding the up- and downstream effectors of the mTOR pathway should be conducted.
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Copy and paste a formatted citation
Spandidos Publications style
Afonso J, Longatto-Filho A, Da Silva VM, Amaro T and Santos LL: Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients. Oncol Lett 8: 1447-1454, 2014.
APA
Afonso, J., Longatto-Filho, A., Da Silva, V.M., Amaro, T., & Santos, L.L. (2014). Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients. Oncology Letters, 8, 1447-1454. https://doi.org/10.3892/ol.2014.2392
MLA
Afonso, J., Longatto-Filho, A., Da Silva, V. M., Amaro, T., Santos, L. L."Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients". Oncology Letters 8.4 (2014): 1447-1454.
Chicago
Afonso, J., Longatto-Filho, A., Da Silva, V. M., Amaro, T., Santos, L. L."Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients". Oncology Letters 8, no. 4 (2014): 1447-1454. https://doi.org/10.3892/ol.2014.2392
Copy and paste a formatted citation
x
Spandidos Publications style
Afonso J, Longatto-Filho A, Da Silva VM, Amaro T and Santos LL: Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients. Oncol Lett 8: 1447-1454, 2014.
APA
Afonso, J., Longatto-Filho, A., Da Silva, V.M., Amaro, T., & Santos, L.L. (2014). Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients. Oncology Letters, 8, 1447-1454. https://doi.org/10.3892/ol.2014.2392
MLA
Afonso, J., Longatto-Filho, A., Da Silva, V. M., Amaro, T., Santos, L. L."Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients". Oncology Letters 8.4 (2014): 1447-1454.
Chicago
Afonso, J., Longatto-Filho, A., Da Silva, V. M., Amaro, T., Santos, L. L."Phospho-mTOR in non-tumour and tumour bladder urothelium: Pattern of expression and impact on urothelial bladder cancer patients". Oncology Letters 8, no. 4 (2014): 1447-1454. https://doi.org/10.3892/ol.2014.2392
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