Diagnostic accuracy of laxative-free computed tomographic colonography for detection of adenomatous polyps in asymptomatic adults, A prospective evaluation

Michael E. Zalis, Michael A. Blake, Wenli Cai, Peter F. Hahn, Elkan F. Halpern, Imrana G. Kazam, Myles Keroack, Cordula Magee, Janne J. Näppi, Rocio Perez-Johnston, John R. Saltzman, Abhinav Vij, Judy Yee, Hiroyuki Yoshida

Research output: Contribution to journalArticle

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Abstract

Background: Colon screening by optical colonoscopy (OC) or computed tomographic colonography (CTC) requires a laxative bowel preparation, which inhibits screening participation. Objective: To assess the performance of detecting adenomas 6 mm or larger and patient experience of laxative-free, computeraided CTC. Design: Prospective test comparison of laxative-free CTC and OC. The CTC included electronic cleansing and computer-aided detection. Optical colonoscopy examinations were initially blinded to CTC results, which were subsequently revealed during colonoscope withdrawal; this method permitted reexamination to resolve discrepant findings. Unblinded OC served as a reference standard. (ClinicalTrials.gov registration number: NCT01200303) Setting: Multicenter ambulatory imaging and endoscopy centers. Participants: 605 adults aged 50 to 85 years at average to moderate risk for colon cancer. Measurements: Per-patient sensitivity and specificity of CTC and first-pass OC for detecting adenomas at thresholds of 10 mm or greater, 8 mm or greater, and 6 mm or greater; per-lesion sensitivity and survey data describing patient experience with preparations and examinations. Results: For adenomas 10 mm or larger, per-patient sensitivity of CTC was 0.91 (95% CI, 0.71 to 0.99) and specificity was 0.85 (CI, 0.82 to 0.88); sensitivity of OC was 0.95 (CI, 0.77 to 1.00) and specificity was 0.89 (CI, 0.86 to 0.91). Sensitivity of CTC was 0.70 (CI, 0.53 to 0.83) for adenomas 8 mm or larger and 0.59 (CI, 0.47 to 0.70) for those 6 mm or larger; sensitivity of OC for adenomas 8 mm or larger was 0.88 (CI, 0.73 to 0.96) and 0.76 (CI, 0.64 to 0.85) for those 6 mm or larger. The specificity of OC at the threshold of 8 mm or larger was 0.91 and at 6 mm or larger was 0.94. Specificity for OC was greater than that for CTC, which was 0.86 at the threshold of 8 mm or larger and 0.88 at 6 mm or larger (P = 0.02). Reported participant experience for comfort and difficulty of examination preparation was better with CTC than OC. Limitations: There were 3 CTC readers. The survey instrument was not independently validated. Conclusion: Computed tomographic colonography was accurate in detecting adenomas 10 mm or larger but less so for smaller lesions. Patient experience was better with laxative-free CTC. These results suggest a possible role for laxative-free CTC as an alternate screening method. Primary Funding Source: GE Healthcare and the American Cancer Society.

Original languageEnglish (US)
Pages (from-to)692-702
Number of pages11
JournalAnnals of Internal Medicine
Volume156
Issue number10
StatePublished - May 22 2012
Externally publishedYes

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Computed Tomographic Colonography
Adenomatous Polyps
Laxatives
Colonoscopy
Adenoma
Colonoscopes

ASJC Scopus subject areas

  • Internal Medicine

Cite this

Zalis, M. E., Blake, M. A., Cai, W., Hahn, P. F., Halpern, E. F., Kazam, I. G., ... Yoshida, H. (2012). Diagnostic accuracy of laxative-free computed tomographic colonography for detection of adenomatous polyps in asymptomatic adults, A prospective evaluation. Annals of Internal Medicine, 156(10), 692-702.

Diagnostic accuracy of laxative-free computed tomographic colonography for detection of adenomatous polyps in asymptomatic adults, A prospective evaluation. / Zalis, Michael E.; Blake, Michael A.; Cai, Wenli; Hahn, Peter F.; Halpern, Elkan F.; Kazam, Imrana G.; Keroack, Myles; Magee, Cordula; Näppi, Janne J.; Perez-Johnston, Rocio; Saltzman, John R.; Vij, Abhinav; Yee, Judy; Yoshida, Hiroyuki.

In: Annals of Internal Medicine, Vol. 156, No. 10, 22.05.2012, p. 692-702.

Research output: Contribution to journalArticle

Zalis, ME, Blake, MA, Cai, W, Hahn, PF, Halpern, EF, Kazam, IG, Keroack, M, Magee, C, Näppi, JJ, Perez-Johnston, R, Saltzman, JR, Vij, A, Yee, J & Yoshida, H 2012, 'Diagnostic accuracy of laxative-free computed tomographic colonography for detection of adenomatous polyps in asymptomatic adults, A prospective evaluation', Annals of Internal Medicine, vol. 156, no. 10, pp. 692-702.
Zalis, Michael E. ; Blake, Michael A. ; Cai, Wenli ; Hahn, Peter F. ; Halpern, Elkan F. ; Kazam, Imrana G. ; Keroack, Myles ; Magee, Cordula ; Näppi, Janne J. ; Perez-Johnston, Rocio ; Saltzman, John R. ; Vij, Abhinav ; Yee, Judy ; Yoshida, Hiroyuki. / Diagnostic accuracy of laxative-free computed tomographic colonography for detection of adenomatous polyps in asymptomatic adults, A prospective evaluation. In: Annals of Internal Medicine. 2012 ; Vol. 156, No. 10. pp. 692-702.
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abstract = "Background: Colon screening by optical colonoscopy (OC) or computed tomographic colonography (CTC) requires a laxative bowel preparation, which inhibits screening participation. Objective: To assess the performance of detecting adenomas 6 mm or larger and patient experience of laxative-free, computeraided CTC. Design: Prospective test comparison of laxative-free CTC and OC. The CTC included electronic cleansing and computer-aided detection. Optical colonoscopy examinations were initially blinded to CTC results, which were subsequently revealed during colonoscope withdrawal; this method permitted reexamination to resolve discrepant findings. Unblinded OC served as a reference standard. (ClinicalTrials.gov registration number: NCT01200303) Setting: Multicenter ambulatory imaging and endoscopy centers. Participants: 605 adults aged 50 to 85 years at average to moderate risk for colon cancer. Measurements: Per-patient sensitivity and specificity of CTC and first-pass OC for detecting adenomas at thresholds of 10 mm or greater, 8 mm or greater, and 6 mm or greater; per-lesion sensitivity and survey data describing patient experience with preparations and examinations. Results: For adenomas 10 mm or larger, per-patient sensitivity of CTC was 0.91 (95{\%} CI, 0.71 to 0.99) and specificity was 0.85 (CI, 0.82 to 0.88); sensitivity of OC was 0.95 (CI, 0.77 to 1.00) and specificity was 0.89 (CI, 0.86 to 0.91). Sensitivity of CTC was 0.70 (CI, 0.53 to 0.83) for adenomas 8 mm or larger and 0.59 (CI, 0.47 to 0.70) for those 6 mm or larger; sensitivity of OC for adenomas 8 mm or larger was 0.88 (CI, 0.73 to 0.96) and 0.76 (CI, 0.64 to 0.85) for those 6 mm or larger. The specificity of OC at the threshold of 8 mm or larger was 0.91 and at 6 mm or larger was 0.94. Specificity for OC was greater than that for CTC, which was 0.86 at the threshold of 8 mm or larger and 0.88 at 6 mm or larger (P = 0.02). Reported participant experience for comfort and difficulty of examination preparation was better with CTC than OC. Limitations: There were 3 CTC readers. The survey instrument was not independently validated. Conclusion: Computed tomographic colonography was accurate in detecting adenomas 10 mm or larger but less so for smaller lesions. Patient experience was better with laxative-free CTC. These results suggest a possible role for laxative-free CTC as an alternate screening method. Primary Funding Source: GE Healthcare and the American Cancer Society.",
author = "Zalis, {Michael E.} and Blake, {Michael A.} and Wenli Cai and Hahn, {Peter F.} and Halpern, {Elkan F.} and Kazam, {Imrana G.} and Myles Keroack and Cordula Magee and N{\"a}ppi, {Janne J.} and Rocio Perez-Johnston and Saltzman, {John R.} and Abhinav Vij and Judy Yee and Hiroyuki Yoshida",
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T1 - Diagnostic accuracy of laxative-free computed tomographic colonography for detection of adenomatous polyps in asymptomatic adults, A prospective evaluation

AU - Zalis, Michael E.

AU - Blake, Michael A.

AU - Cai, Wenli

AU - Hahn, Peter F.

AU - Halpern, Elkan F.

AU - Kazam, Imrana G.

AU - Keroack, Myles

AU - Magee, Cordula

AU - Näppi, Janne J.

AU - Perez-Johnston, Rocio

AU - Saltzman, John R.

AU - Vij, Abhinav

AU - Yee, Judy

AU - Yoshida, Hiroyuki

PY - 2012/5/22

Y1 - 2012/5/22

N2 - Background: Colon screening by optical colonoscopy (OC) or computed tomographic colonography (CTC) requires a laxative bowel preparation, which inhibits screening participation. Objective: To assess the performance of detecting adenomas 6 mm or larger and patient experience of laxative-free, computeraided CTC. Design: Prospective test comparison of laxative-free CTC and OC. The CTC included electronic cleansing and computer-aided detection. Optical colonoscopy examinations were initially blinded to CTC results, which were subsequently revealed during colonoscope withdrawal; this method permitted reexamination to resolve discrepant findings. Unblinded OC served as a reference standard. (ClinicalTrials.gov registration number: NCT01200303) Setting: Multicenter ambulatory imaging and endoscopy centers. Participants: 605 adults aged 50 to 85 years at average to moderate risk for colon cancer. Measurements: Per-patient sensitivity and specificity of CTC and first-pass OC for detecting adenomas at thresholds of 10 mm or greater, 8 mm or greater, and 6 mm or greater; per-lesion sensitivity and survey data describing patient experience with preparations and examinations. Results: For adenomas 10 mm or larger, per-patient sensitivity of CTC was 0.91 (95% CI, 0.71 to 0.99) and specificity was 0.85 (CI, 0.82 to 0.88); sensitivity of OC was 0.95 (CI, 0.77 to 1.00) and specificity was 0.89 (CI, 0.86 to 0.91). Sensitivity of CTC was 0.70 (CI, 0.53 to 0.83) for adenomas 8 mm or larger and 0.59 (CI, 0.47 to 0.70) for those 6 mm or larger; sensitivity of OC for adenomas 8 mm or larger was 0.88 (CI, 0.73 to 0.96) and 0.76 (CI, 0.64 to 0.85) for those 6 mm or larger. The specificity of OC at the threshold of 8 mm or larger was 0.91 and at 6 mm or larger was 0.94. Specificity for OC was greater than that for CTC, which was 0.86 at the threshold of 8 mm or larger and 0.88 at 6 mm or larger (P = 0.02). Reported participant experience for comfort and difficulty of examination preparation was better with CTC than OC. Limitations: There were 3 CTC readers. The survey instrument was not independently validated. Conclusion: Computed tomographic colonography was accurate in detecting adenomas 10 mm or larger but less so for smaller lesions. Patient experience was better with laxative-free CTC. These results suggest a possible role for laxative-free CTC as an alternate screening method. Primary Funding Source: GE Healthcare and the American Cancer Society.

AB - Background: Colon screening by optical colonoscopy (OC) or computed tomographic colonography (CTC) requires a laxative bowel preparation, which inhibits screening participation. Objective: To assess the performance of detecting adenomas 6 mm or larger and patient experience of laxative-free, computeraided CTC. Design: Prospective test comparison of laxative-free CTC and OC. The CTC included electronic cleansing and computer-aided detection. Optical colonoscopy examinations were initially blinded to CTC results, which were subsequently revealed during colonoscope withdrawal; this method permitted reexamination to resolve discrepant findings. Unblinded OC served as a reference standard. (ClinicalTrials.gov registration number: NCT01200303) Setting: Multicenter ambulatory imaging and endoscopy centers. Participants: 605 adults aged 50 to 85 years at average to moderate risk for colon cancer. Measurements: Per-patient sensitivity and specificity of CTC and first-pass OC for detecting adenomas at thresholds of 10 mm or greater, 8 mm or greater, and 6 mm or greater; per-lesion sensitivity and survey data describing patient experience with preparations and examinations. Results: For adenomas 10 mm or larger, per-patient sensitivity of CTC was 0.91 (95% CI, 0.71 to 0.99) and specificity was 0.85 (CI, 0.82 to 0.88); sensitivity of OC was 0.95 (CI, 0.77 to 1.00) and specificity was 0.89 (CI, 0.86 to 0.91). Sensitivity of CTC was 0.70 (CI, 0.53 to 0.83) for adenomas 8 mm or larger and 0.59 (CI, 0.47 to 0.70) for those 6 mm or larger; sensitivity of OC for adenomas 8 mm or larger was 0.88 (CI, 0.73 to 0.96) and 0.76 (CI, 0.64 to 0.85) for those 6 mm or larger. The specificity of OC at the threshold of 8 mm or larger was 0.91 and at 6 mm or larger was 0.94. Specificity for OC was greater than that for CTC, which was 0.86 at the threshold of 8 mm or larger and 0.88 at 6 mm or larger (P = 0.02). Reported participant experience for comfort and difficulty of examination preparation was better with CTC than OC. Limitations: There were 3 CTC readers. The survey instrument was not independently validated. Conclusion: Computed tomographic colonography was accurate in detecting adenomas 10 mm or larger but less so for smaller lesions. Patient experience was better with laxative-free CTC. These results suggest a possible role for laxative-free CTC as an alternate screening method. Primary Funding Source: GE Healthcare and the American Cancer Society.

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