COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Computed Tomographic Colonography in Screening Healthy Participants for Colorectal Cancer (ACRIN 6664)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00084929
Recruitment Status : Completed
First Posted : June 11, 2004
Last Update Posted : October 8, 2013
National Cancer Institute (NCI)
Information provided by (Responsible Party):
American College of Radiology Imaging Network

Brief Summary:

RATIONALE: New diagnostic procedures such as computed tomographic colonography may improve the ability to detect colorectal cancer and may provide a less invasive method of detection.

PURPOSE: This clinical trial is studying how well computed tomographic colonography works in screening healthy participants for colorectal cancer.

Condition or disease Intervention/treatment Phase
Colorectal Cancer Procedure: CT Colonography Phase 2 Phase 3

Detailed Description:



  • Compare the sensitivity of computed tomographic colonography (CTC) vs colonoscopy for detecting significantly large lesions (≥ 10 mm in diameter) in asymptomatic participants, in terms of specificity, area under the ROC curve, and predictive values for detecting clinically significant colorectal neoplasia.


  • Determine the interobserver variation in accuracy of interpreting CTC examinations of these participants, including any benefits of a primary 3-dimensional read and/or independent second interpretations.
  • Determine the effects of different colon preparations on the accuracy of CTC in these participants.
  • Compare participant acceptance and willingness to have a repeat examination by CTC vs colonoscopy.
  • Determine the accuracy of CTC in detecting flat lesions in the colon of these participants.

OUTLINE: This is a multicenter study.

Participants receive an oral laxative, oral bisacodyl, and three doses of oral barium sulphate 24 hours before imaging. After cathartic cleansing, participants undergo computed tomographic colonography followed by colonoscopy.

Participants are followed up for approximately 4 weeks.

PROJECTED ACCRUAL: A total of 2,607 participants will be accrued for this study.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 2607 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Screening
Official Title: National CT Colonography Trial
Study Start Date : February 2005
Actual Primary Completion Date : September 2008

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: CT Colonography
CT colonography conducted during the same assessment as colonoscopy.
Procedure: CT Colonography
CT colonography performed for comparison with colonoscopy results performed during the same screening assessment.
Other Names:
  • CT colonography trial
  • colonoscopy

Primary Outcome Measures :
  1. Sensitivity [ Time Frame: 1 Day ]
    Evaluate the sensitivity of CT colonography for detecting participants with at least one proved clinically significant large lesion (at least 10 mm in diameter), using colonoscopy as the reference standard.

Secondary Outcome Measures :
  1. Interobserver variation in accuracy [ Time Frame: 1 Day ]
    Evaluate interobserver variation in accuracy of interpreting CTC examinations, including any benefits of 1) a primary 3D read and/or 2) independent second interpretations.

  2. Additional secondary outcome measures [ Time Frame: 1 Day ]
    1. To develop a well-annotated database of CTC case materials for future study. Data appropriate for computed-aided diagnosis development will be collected for this purpose. This data, subject to ACRIN Image Archive policies, will be made available to the image processing and clinical community. Availability of CTC case materials may be via the internet.
    2. To assess the cost-effectiveness of CTC compared to other CRC screening tests.

Other Outcome Measures:
  1. Descriptive outcomes [ Time Frame: 1 Day ]
    1. To describe the effects of different colon preparations, as ordered by the referring gastroenterologist, on accuracy of CTC.
    2. To describe patient acceptance of CT colonography and their willingness to have a repeat examination in comparison to optical colonoscopy.
    3. To describe the various morphologic features, distribution, and frequency of flat colonic lesions, and to estimate the accuracy of CTC in detecting flat lesions in the colon.
    4. To describe the prevalence and clinical significance of extracolonic abnormalities detected in the course of a CTC examination.
    5. To describe the various methods of CTC evaluation and assess differences in software platforms by evaluating user preferences and performance differences, including evaluation times.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   50 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
  1. Inclusion Criteria

    • Male or female outpatients
    • Aged 50 years or older
    • Scheduled for screening colonoscopy
    • Participant's signed informed consent
  2. Exclusion Criteria

    • Symptoms of disease of the lower gastrointestinal tract, including

      • Melanotic stools or/and hematochezia on more than one occasion in the previous six months
      • Lower abdominal pain that would normally require a medical evaluation
    • Inflammatory bowel disease and/or familial polyposis syndrome
    • Serious medical conditions that would increase the risk associated with colonoscopy or are so severe that screening would have no benefit
    • Pregnancy
    • Previous colonoscopy within the past five years
    • Anemia (hemoglobin less than 10 gm/dl)
    • Positive fecal occult blood test (FOBT)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00084929

Layout table for location information
United States, Arizona
Mayo Clinic Scottsdale
Scottsdale, Arizona, United States, 85259-5499
United States, California
Moores UCSD Cancer Center
La Jolla, California, United States, 92093-0658
Jonsson Comprehensive Cancer Center at UCLA
Los Angeles, California, United States, 90095-1781
Veterans Affairs Medical Center - San Francisco
San Francisco, California, United States, 94121
United States, Colorado
Invision/Radiology Imaging Associates - Englewood
Englewood, Colorado, United States, 80112
United States, Connecticut
Yale Cancer Center
New Haven, Connecticut, United States, 06520-8028
United States, Illinois
University of Chicago Cancer Research Center
Chicago, Illinois, United States, 60637-1470
Clinical Radiologists, S.C. at Memorial Medical Center
Springfield, Illinois, United States, 62781
United States, Maryland
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Baltimore, Maryland, United States, 21231-2410
United States, Massachusetts
Beth Israel Deaconess Medical Center
Boston, Massachusetts, United States, 02215
United States, Minnesota
Mayo Clinic Cancer Center
Rochester, Minnesota, United States, 55905
United States, Missouri
Mallinckrodt Institute of Radiology at Washington University Medical Center
St. Louis, Missouri, United States, 63110
United States, Texas
M.D. Anderson Cancer Center at University of Texas
Houston, Texas, United States, 77030-4009
United States, Virginia
Virginia Commonwealth University Massey Cancer Center
Richmond, Virginia, United States, 23298-0037
Sponsors and Collaborators
American College of Radiology Imaging Network
National Cancer Institute (NCI)
Layout table for investigator information
Study Chair: C. Daniel Johnson, MD Mayo Clinic
Publications of Results:
Siewert B, Gareen I, Vanness D, et al.: ACRIN 6664: patient acceptance and preferance of CT colonography compared to optical colonoscopy for colon cancer screening. [Abstract] J Clin Oncol 27 (Suppl 15): A-4034, 2009.

Other Publications:
Layout table for additonal information
Responsible Party: American College of Radiology Imaging Network Identifier: NCT00084929    
Other Study ID Numbers: CDR0000367101
First Posted: June 11, 2004    Key Record Dates
Last Update Posted: October 8, 2013
Last Verified: October 2013
Keywords provided by American College of Radiology Imaging Network:
colon cancer
rectal cancer
Additional relevant MeSH terms:
Layout table for MeSH terms
Colorectal Neoplasms
Intestinal Neoplasms
Gastrointestinal Neoplasms
Digestive System Neoplasms
Neoplasms by Site
Digestive System Diseases
Gastrointestinal Diseases
Colonic Diseases
Intestinal Diseases
Rectal Diseases