Sistema FMUSP-HC: Faculdade de Medicina da Universidade de São Paulo (FMUSP) e Hospital das Clínicas da FMUSPDIP, NelsonREIS, Sabrina T.ABE, Daniel K.VIANA, Nayara I.MORAIS, Denis R.MOURA, Caio M.KATZ, BetinaSILVA, Iran A.SROUGI, MiguelLEITE, Katia R. M.2015-07-012015-07-012014International Braz J Urol, v.40, n.5, p.644-649, 20141677-5538https://observatorio.fm.usp.br/handle/OPI/9236Purpose: To analyze a possible correlation between a miRNA expression profile and important prognostic factors for pTa urothelial carcinomas (UC), including tumor size, multiplicity and episodes of recurrence. Materials and Methods: Thirty low-grade non-invasive pTa bladder UC from patients submitted to transurethral resection were studied, in a mean follow-up of 17.7 months. As controls, we used normal bladder tissue from five patients submitted to retropubic prostatectomy to treat benign prostatic hyperplasia. Extraction, cDNA and amplification were performed for 14 miRNAs (miR-100, -10a, -21, -205, -let7c, -143, -145, -221, -223, -15a, -16, -199a and -452) using specific kits, and RNU-43 and -48 were used as endogenous controls. Statistical tests were used to compare tumor size, multiplicity and episodes of recurrence with miRNAs expression profiles. Results: There was a marginal correlation between multiplicity and miR-let7c over- expression. For all others miRNA no correlation between their expression and prognostic factors was found. Conclusion: We did not find differences for miRNAs expression profiles associated with prognostic factors in tumor group studied. The majority of miRNAs are down-regulated, except miR-10a, over-expressed in most of cases, seeming to have increased levels in tumor with more unfavorable prognostic factors. More studies are needed in order to find a miRNA profile able to provide prognosis in pTa UC to be used in clinical practice.engopenAccessMicroRNAsUrinary Bladder NeoplasmsPrognosisMolecular Biologysuperficial bladder-cancergrowth-factor receptor-3cell-carcinomagene-mutationsfgfr3raspathwayssurvivalfamilystagearticleCopyright BRAZILIAN SOC UROL10.1590/S1677-5538.IBJU.2014.05.09Urology & Nephrology1677-6119