CTCs have emerged as a potential source of clinical significance. But with numerous isolating systems currently available, the numbers of captured CTCs vary widely. At this point, CellSearch remains the only FDA-approved system with clinical significance whereby the results could be used to monitor patients with metastatic colon, breast, or prostate cancer. However, its inability to isolate CTCs from non-high risk prostate cancer patients or CTCs that are EpCAM-negative has led to criticism. In this study, we have shown that size-based filtration successfully isolates CTCs from patients with localized and metastatic prostate cancer. We have also shown that CTCs can be successfully isolated from low and intermediate risk groups. Additionally, clusters of CTCs were preserved and isolated in all localized risk groups and metastatic patients. Furthermore, we enumerated the isolated CTCs using automated and manual methods in low risk, intermediate risk, high risk, and metastatic prostate cancer. The automated and manual counts were comparable. Moreover, the amounts of clusters and the size of clusters correlated with the status and stage of prostate cancer. / October 2016

Orientador: Adriana Polachini Valle / Resumo: Introdução: O câncer de próstata (CP) é o mais incidente entre os homens em todas as regiões do Brasil. A detecção e caracterização de células tumorais circulantes (CTCs) tem sido apontada como uma alternativa para melhor compreensão da biologia dos tumores, incluindo câncer de próstata. Objetivo: Este estudo tem como objetivo avaliar a detecção de CTCs em pacientes com tumor de próstata localizado e metastático por teste rápido de filtração celular. Metodologia: Foram incluídos pacientes com diagnóstico anatomopatológico de câncer de próstata ou neoplasia intraepitelial prostática. Os dados demográficos, laudos anatomopatológicos e de Cintilografia Óssea e valores do antígeno prostático especifico ( PSA) foram obtidos pelo estudo dos prontuários médicos dos pacientes. Os pacientes foram classificados como portadores de tumor metastático quando apresentavam evidência de imagem metastática pela Cintilografia Óssea. As CTS foram isoladas por teste rápido de filtração celular com posterior imunocitoquímica utilizando-se anticorpos monoclonais anti-PSA para caracterização câncer de próstata específica das células. Resultados: As CTCs foram detectadas em 9 dos 21 pacientes (43%) com positividade de 60% no grupo metastático e 36% no grupo de tumor localizado. Não foram observadas associações entre os valores de PSA e tratamento instituído com a detecção de CTCS. Discussão: A positividade das CTCs no presente estudo mostrou-se semelhante aos dados da literatura, embora possam ser ci... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Introduction: Prostate cancer (PC) is the most frequent among men in all regions of Brazil. The detection and characterization of circulating tumor cells (CTCs) has been pointed out as an alternative for a better understanding of the biology of tumors, including prostate cancer. Objective: This study aims to evaluate the detection of CTCs in patients with localized and metastatic prostate tumor by rapid cell filtration test. Methodology: Patients with anatomopathological diagnosis of prostate cancer or prostatic intraepithelial neoplasia were included. Demographic data, anatomopathological and bone scintigraphy reports and prostate specific antigen (PSA) values were obtained by the study of patients' medical records. Patients were classified as having metastatic tumor when they presented evidence of metastatic image by Bone Scintigraphy. The CTS were isolated by rapid cell filtration test with subsequent immunocytochemistry using anti-PSA monoclonal antibodies for cell-specific prostate cancer characterization. Results: CTCs were detected in 9 of the 21 patients (43%) with 60% positivity in the metastatic group and 36% in the localized tumor group. No associations were observed between PSA values and treatment established with CTCS detection. Discussion: The positivity of the CTCs in the present study was similar to the data in the literature, although some limitations of the study may be cited, such as a small number of patients included, difficulties encountered by research... (Complete abstract click electronic access below) / Mestre