Esta página foi traduzida automaticamente e a precisão da tradução não é garantida. Por favor, consulte o versão em inglês para um texto fonte.

Triagem para câncer colorretal em pacientes idosos (PLCO Screening Trial)

10 de novembro de 2026 atualizado por: National Cancer Institute (NCI)

Ensaio de Triagem de Câncer de Próstata, Pulmão, Colorretal e Ovário (PLCO)

This clinical trial studies whether screening methods used to diagnose cancer of the prostate, lung, colon, rectum, or ovaries can reduce deaths from these cancers. Screening tests may help doctors find cancer cells early and plan better treatment for colorectal cancer.

Visão geral do estudo

Status

Ativo, não recrutando

Condições

Intervenção / Tratamento

Descrição detalhada

PRIMARY OBJECTIVES:

I. To determine whether screening with flexible sigmoidoscopy (60-cm sigmoidoscope) can reduce mortality from colorectal cancer in women and men aged 55-74 at study entry.

SECONDARY OBJECTIVES:

I. To assess screening variables, other than mortality, for each of the interventions including sensitivity, specificity, and positive predictive value.

II. To assess the incidence, stage, and survival of cancer cases. III. To investigate the mortality predictive value of biologic and/or prognostic characterizations of tumor tissue as intermediate endpoints.

IV. To conduct biomolecular and genetic research into factors associated with cancer carcinogenesis and promotion, as well as the early detection of these factors.

OUTLINE: Participants in the overall PLCO study are stratified by screening center, gender, and age (55-59 vs 60-64 vs 65-69 vs 70-74). Participants are randomized to 1 of 2 arms (control vs screening).

ARM I (Control): Participants receive standard medical care. Participants complete a Diet History Questionnaire (DHQ) at baseline.

ARM II (Colorectal Screening): Participants undergo a colorectal examination with a flexible sigmoidoscope at baseline and year 5. A scheduling and tracking procedure is implemented to ensure regular attendance at repeat screens for participants screened negative or for those who are designated suspicious or positive at screening but for whom subsequent diagnostic procedures do not reveal colorectal cancer (follow-up diagnostic procedures are through their own medical care environment). Participants diagnosed with colorectal cancer via a screening test are referred for treatment in accordance with current accepted practice for appropriate stage of disease, patient age, and medical condition; a procedure is provided for contact with qualified medical personnel to insure appropriate therapy.

Participants complete a Dietary Questionnaire (DQX) at baseline and DHQ at year 3. An Annual Study Update (ADU) (previously referred to as the Periodic Survey of Health [PSH] questionnaire) is mailed to each participant annually for 13 years to identify all prevalent and incident colorectal cancers as all deaths that occur among both screened and control subjects during the trial.

After completion of screening, participants are followed up for at least 13 years.

Tipo de estudo

Intervencional

Inscrição (Real)

154900

Estágio

  • Não aplicável

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Locais de estudo

    • Maryland
      • Bethesda, Maryland, Estados Unidos, 20892
        • National Institutes of Health Clinical Center

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

55 anos a 74 anos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Tudo

Descrição

Exclusion Criteria:

  • Men and women who at the time of randomization are less than 55 or greater than or equal to 75 years of age

  • Individuals undergoing treatment for cancer at this time, excluding basal-cell and squamous-cell skin cancer

  • Individuals with known prior cancer of the colon, rectum, lung, prostate

    • This includes primary or metastatic PLCO cancers
  • Individuals with previous surgical removal of the entire colon, one lung, or the entire prostate (men only)

    • Until October 1996, women with previous surgical removal of both ovaries were excluded from the trial. In order to increase the enrollment of women into the trial, beginning in October 1996, these women were no longer excluded for this reason.
  • Individuals who are participating in another cancer screening or cancer primary prevention trial

  • Males who have taken Proscar/Propecia/finasteride in the past 6 months

    • NOTE: Individuals who are already enrolled in the trial when their physician prescribes finasteride are not prevented from taking this medication. As a result, these participants will continue to be screened and followed just as those participants who are not on finasteride.
    • NOTE: Men who are taking Tamoxifen are not excluded from any part of the PLCO Screening Trial.
    • Prior to April 1, 1999 women were excluded from the trial if they were currently taking or had taken Tamoxifen or Evista\Raloxifene in the past 6 months. As of April 1999 based on a decision from the PLCO Ovary Subcommittee, women who have or are currently taking Tamoxifen or Evista\Raloxifene are not excluded from participation.
  • Individuals who are unwilling or unable to sign the informed consent form

  • Males who have had more than one PSA blood test in the past three years

  • Individuals who have had a colonoscopy, sigmoidoscopy, or barium enema in the past three years

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Triagem
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Solteiro

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Sem intervenção: Control

Participants receive standard medical care. Participants complete a DHQ at baseline.

Comparador Ativo: Colorectal Screening

Participants undergo a colorectal examination with a flexible sigmoidoscope at baseline and year 5. Participants complete a DQX at baseline and DHQ at year 3. An ADU (previously referred to as the PSH questionnaire) is mailed to each participant annually for 13 years to identify all prevalent and incident colorectal cancers as all deaths that occur among both screened and control subjects during the trial.

Undergo questionnaire assessments

Undergo a flexible sigmoidoscopy

Outros nomes:
  • Proctossigmoidoscopia

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Colorectal Cancer Deaths
Prazo: Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Colorectal cancer deaths confirmed in participants by a death review committee if available, otherwise by death certificate.

Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.
Colorectal Cancer Death Rates
Prazo: Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Colorectal cancer deaths confirmed in participants by a death review committee if available, otherwise by death certificate. Rate is the number of deaths divided by person years of follow-up in the study.

Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Deaths From All Causes
Prazo: Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Deaths from all causes were compared between the colorectal cancer screening arm and the usual care arm.

Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.
Death Rates From All Causes
Prazo: Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Deaths from all causes were compared between the colorectal cancer screening arm and the usual care arm. Rate is the number of deaths divided by person years of follow-up in the study.

Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.
Colorectal Cancer Incidence
Prazo: Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Colorectal cancer diagnoses confirmed by medical record abstraction.

Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.
Colorectal Cancer Incidence Rates
Prazo: Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.

Colorectal cancer diagnoses confirmed by medical record abstraction. Incidence rate (cumulative) defined as colorectal cancer diagnoses divided by person years at risk for colorectal cancer.

Events through 13 years of follow-up or through December 31, 2009; median follow-up 12.1 years.
Complications of Diagnostic Evaluation Following a Positive Screening Test
Prazo: One year from screening examination

Number of participants who experienced complications during diagnostic work-up of a positive colorectal examination.

One year from screening examination
T0 (Baseline) FSG Screening Results
Prazo: T0 (at study entry)

Flexible sigmoidoscopy (FSG) result

T0 (at study entry)
T3/T5 FSG Screening Result
Prazo: T3 (three years after entry) or T5 (five years after entry)

Flexible sigmoidoscopy (FSG) result

T3 (three years after entry) or T5 (five years after entry)

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Investigadores

  • Investigador principal: Christine D Berg, National Cancer Institute (NCI)

Publicações e links úteis

A pessoa responsável por inserir informações sobre o estudo fornece voluntariamente essas publicações. Estes podem ser sobre qualquer coisa relacionada ao estudo.

Publicações Gerais

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

16 de novembro de 1993

Conclusão Primária (Real)

21 de maio de 2012

Conclusão do estudo (Estimado)

30 de junho de 2027

Datas de inscrição no estudo

Enviado pela primeira vez

28 de setembro de 2012

Enviado pela primeira vez que atendeu aos critérios de CQ

1 de outubro de 2012

Primeira postagem (Estimado)

2 de outubro de 2012

Atualizações de registro de estudo

Última Atualização Postada (Real)

13 de novembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

10 de novembro de 2026

Última verificação

1 de julho de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • NCI-2012-01757
  • CDR0000078532
  • NCI-P93-0050
  • PLCO-1
  • NCI-2012-01757 (Identificador de registro: CTRP (Clinical Trial Reporting Program))
  • PLCO-Colorectal (Outro identificador: National Cancer Institute)

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .