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Screening for kolorektal cancer hos ældre patienter (PLCO Screening Trial)

10. november 2026 opdateret af: National Cancer Institute (NCI)

Forsøg med screening af prostata-, lunge-, kolorektal- og ovariekræft (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.

Studieoversigt

Status

Aktiv, ikke rekrutterende

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

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.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

154900

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Maryland
      • Bethesda, Maryland, Forenede Stater, 20892
        • National Institutes of Health Clinical Center

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

55 år til 74 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

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

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Screening
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Enkelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Ingen indgriben: Control

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

Aktiv komparator: 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

Andre navne:
  • Proctosigmoidoskopi

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Colorectal Cancer Deaths
Tidsramme: 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
Tidsramme: 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.

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Deaths From All Causes
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: T0 (at study entry)

Flexible sigmoidoscopy (FSG) result

T0 (at study entry)
T3/T5 FSG Screening Result
Tidsramme: 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)

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Efterforskere

  • Ledende efterforsker: Christine D Berg, National Cancer Institute (NCI)

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

16. november 1993

Primær færdiggørelse (Faktiske)

21. maj 2012

Studieafslutning (Anslået)

30. juni 2027

Datoer for studieregistrering

Først indsendt

28. september 2012

Først indsendt, der opfyldte QC-kriterier

1. oktober 2012

Først opslået (Anslået)

2. oktober 2012

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

13. november 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

10. november 2026

Sidst verificeret

1. juli 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • NCI-2012-01757
  • CDR0000078532
  • NCI-P93-0050
  • PLCO-1
  • NCI-2012-01757 (Registry Identifier: CTRP (Clinical Trial Reporting Program))
  • PLCO-Colorectal (Anden identifikator: National Cancer Institute)

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .