Eckstein M, Jung R, Weigelt K, Sikic D, Stoehr R, Geppert CI, Agaimy A, Lieb V, Hartmann A, Wullich B, Wach S, Taubert H (2018)
Publication Type: Journal article
Publication year: 2018
Book Volume: 8
DOI: 10.1038/s41598-018-35637-4
Piwi-like proteins are essential for stem-cell maintenance and self-renewal in multicellular organisms. We analyzed the expression of Piwi-like 1 and Piwi-like 2 by immunohistochemistry (IHC) in 95 muscle invasive bladder cancer (MIBC) samples using tissue microarray. Application of an immunoreactive score (IRS) revealed 37 and 45 patients who were Piwi-like 1 and -2 positive (IRS > 2). IHC results were correlated with clinico-pathological and survival data. The expression of both proteins was positively correlated with each other, lymph node metastasis and expression of CK20 and GATA 3. A negative correlation for both proteins was detected for disease-specific survival (DSS), recurrence, Ki67/MIB1 proliferation index, and CK5 expression. Detection of Piwi-like 1 protein positivity was associated with poor DSS (P = 0.019; log rank test, Kaplan-Meier analysis), and in multivariate Cox's analysis (adjusted to tumor stage and tumor grade), it was an independent prognostic factor for DSS (RR = 2.16; P = 0.011). Piwi-like 2 positivity was associated with DSS (P = 0.008) and recurrence-free survival (RFS; P = 0.040), and in multivariate Cox's analysis, Piwi-like 2 positivity was an independent prognostic factor for DSS (RR = 2.46; P = 0.004) and RFS (RR = 3.0; P = 0.003). Most interestingly, in the basal type patient subgroup (CK5+/GATA3-), Piwi-like 2 positivity was associated with poorer DSS, OS and RFS (P < 0.001, P = 0.004 and P = 0.05; log rank test). In multivariate analysis, Piwi-like 2 positivity was an independent prognostic factor for DSS (RR = 12.70; P = 0.001), OS (RR = 6.62; = 0.008) and RFS (RR=13.0; P = 0.040). In summary, Piwi-like 1 and -2 positivity are associated with clinico-pathological factors and survival. Both Piwi-like proteins are suggested as biomarkers for MIBC patients.
APA:
Eckstein, M., Jung, R., Weigelt, K., Sikic, D., Stoehr, R., Geppert, C.-I.,... Taubert, H. (2018). Piwi-like 1 and-2 protein expression levels are prognostic factors for muscle invasive urothelial bladder cancer patients. Scientific Reports, 8. https://doi.org/10.1038/s41598-018-35637-4
MLA:
Eckstein, Markus, et al. "Piwi-like 1 and-2 protein expression levels are prognostic factors for muscle invasive urothelial bladder cancer patients." Scientific Reports 8 (2018).
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