• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
https://doi.org/10.11606/T.5.2023.tde-14122023-171633
Document
Author
Full name
Leonardo Cardili
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2023
Supervisor
Title in Portuguese
Resposta patológica e marcadores imuno-histoquímicos no câncer de próstata localizado de alto risco tratado com terapia neoadjuvante e prostatectomia radical
Keywords in Portuguese
Imuno-histoquímica
Neoplasias da próstata
PTEN fosfo-hidrolase
Regulador transcricional ERG
Terapia neoadjuvante
Abstract in Portuguese
Introdução. A maioria dos casos de câncer de próstata (CaP) é diagnosticada na fase localizada da doença. Ao redor de 20% desses pacientes apresentam alto risco para progressão sistêmica. Esse subgrupo possui maior chance de recidiva bioquímica e maior mortalidade câncer-específica. O tratamento do câncer de próstata localizado de alto risco (CAPLAR) é primordialmente voltado ao controle local da doença e geralmente envolve a prostatectomia radical (PR). Evidências recentes apontam que o uso de terapia de deprivação androgênica intensa (TDA-I) antes da PR poderia elevar as chances de controle local no grupo CAPLAR. Nesse sentido, a busca por biomarcadores capazes de predizer a resposta patológica tem se tornado mais relevante. Objetivo. Avaliar resposta patológica e marcadores imuno-histoquímicos selecionados em indivíduos portadores de CaPLAR tratados com terapia anti-androgênica neoadjuvante (TDA-I) seguida de PR. Metodologia. O presente estudo foi realizado a partir de um ensaio clínico prospectivo voltado à verificação de eficácia e segurança de modalidades de TDA-I neoadjuvante em portadores de CAPLAR elegíveis à prostatectomia radical. Nesse contexto, abordamos a expressão imuno-histoquímica de marcadores selecionados (PTEN, ERG, AR, AR-V7, Glico-R, PSMA, NKX3.1, p53 e Ki67) em biópsias de próstata por agulha. Em seguida, analisamos os resultados pré e pós-tratamento a fim de buscar associações dos parâmetros clínicos, histopatológicos e imuno-histoquímicos com a resposta patológica encontrada no espécime cirúrgico e com a recidiva bioquímica após trinta meses de seguimento. Resultados. Sessenta e dois indivíduos atingiram a etapa cirúrgica do estudo. A taxa global de resposta patológica satisfatória (RCB<0,25 cm³) foi de 22,5% (14/62). Indivíduos com perfil imuno-histoquímico desfavorável (PTEN-deficiente ou ERG-positivo) pré-tratamento (38,7%) exibiram maior quantidade de tumor residual no espécime cirúrgico. Esse perfil mostrou estar associado ao grupo racial branco. A taxa de recorrência bioquímica foi de 48,3% após trinta meses de seguimento. Houve associação significativa entre os grupos de resposta patológica e o intervalo livre de recorrência bioquímica. Na análise multivariada, a carga tumoral foi o melhor preditor pré-tratamento de sucesso terapêutico enquanto que o acometimento linfonodal foi o mehor preditor pós-tratamento de recorrência bioquímica. Conclusões. A neoadjuvância no cenário de CAPLAR é um recurso seguro e inovador que, para um subgrupo selecionado de indivíduos com menor carga tumoral inicial e perfil imuno-histoquímico favorável (PTEN-preservado e ERG-negativo), pode exercer um papel terapêutico complementar ao da cirurgia a fim de otimizar o controle local
Title in English
Pathological response and immunohistochemical biomarkers in high risk localized prostate cancer treated with neoadjuvant therapy and radical prostatectomy
Keywords in English
Immunohistochemistry
Neoadjuvant therapy
Prostate neoplasms
PTEN phosphohydrolase
Transcriptional regulator ERG
Abstract in English
Introduction. Currently prostate cancer is mostly detected in localized stages. Twenty percent of patients present high risk of sistemic progression. This subgroup shows higher chance of biochemical recurrence and cancer-specific mortality. High risk localized prostate cancer (HRLPC) treatment is primarily focused on local disease control and usually requires radical prostatectomy. In spite of the best local treatment, almost half of the patients will progress along their lifetime. Recent evidences point that the use of intense androgenic deprivation therapy before surgery would increase disease free survival rates on HRLPC subgroup. Thereby, the search for new biomarkers to predict therapeutic response is turning more relevant. Objetive. Our aim is to study the pathological response and selected immunomarkers (PTEN, ERG, AR, AR-V7, Glico-R, PSMA, NKX3.1, p53 and Ki67) in HRLPC individuals ongoing a clinical trial based on neoadjuvant therapy followed by radical prostatectomy. Methods. This study is part of a prospective randomized controlled clinical trial which analyzes efficacy and safeness of neoadjuvant hormonal therapy modalities in HRLPC patients eligible for radical prostatectomy. In this context, we evaluated the immunohistochemical expression of selected markers in prostate needle biopsies. We then analyzed the pre and post-treatment results in order to search for clinical, histological and immunohistochemical associations with the pathological response found in the surgical specimen and with the biochemical recurrence after thirty months follow-up. Results. Sixty-two individuals reached the surgical stage of the study. The overall satisfactory pathologic response rate (RCB<0.25 cm³) was 22.5% (14/62). Individuals with an unfavorable immunohistochemical profile (PTEN-deficient or ERG-positive) in the pretreatment biopsy (38.7%) exhibited higher volume of residual tumor in the surgical specimen. This profile was also associated with the white racial group. The biochemical recurrence rate was 48.3% after thirty months of follow-up. There was a significant association between the pathologic response and the biochemical recurrence-free interval. The multivariate analysis showed that the lower pretreatment tumor burden was the best predictor of therapeutic success, while lymph node involvement and perineural invasion were the best predictors of biochemical recurrence. Conclusions. Neoadjuvant therapy in HRLPC is safe and innovative resource that might play a complementary therapeutic role to radical surgery in a selected subgroup of patients with low initial cancer burden and a favorable immunohistochemical profile (PTEN-preserved and ERG-negative)
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
LeonardoCardili.pdf (5.44 Mbytes)
Publishing Date
2024-01-08
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.