{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T11:51:22Z","timestamp":1789386682278,"version":"build-2803163510"},"reference-count":32,"publisher":"American Society of Clinical Oncology (ASCO)","issue":"35","content-domain":{"domain":["ascopubs.org"],"crossmark-restriction":true},"short-container-title":["JCO"],"published-print":{"date-parts":[[2015,12,10]]},"abstract":"<jats:sec><jats:title>Purpose<\/jats:title><jats:p> Colonoscopic surveillance is recommended for individuals with familial colorectal cancer (CRC). However, the appropriate screening interval has not yet been determined. The aim of this randomized trial was to compare a 3-year with a 6-year screening interval. <\/jats:p><\/jats:sec><jats:sec><jats:title>Patients and Methods<\/jats:title><jats:p> Individuals between ages 45 and 65 years with one first-degree relative with CRC age &lt; 50 years or two first-degree relatives with CRC were selected. Patients with zero to two adenomas at baseline were randomly assigned to one of two groups: group A (colonoscopy at 6 years) or group B (colonoscopy at 3 and 6 years). The primary outcome measure was advanced adenomatous polyps (AAPs). Risk factors studied included sex, age, type of family history, and baseline endoscopic findings. <\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p> A total of 528 patients were randomly assigned (group A, n = 262; group B, n = 266). Intention-to-treat analysis showed no significant difference in the proportion of patients with AAPs at the first follow-up examination at 6 years in group A (6.9%) versus 3 years in group B (3.5%). Also, the proportion of patients with AAPs at the final follow-up examination at 6 years in group A (6.9%) versus 6 years in group B (3.4%) was not significantly different. Only AAPs at baseline was a significant predictor for the presence of AAPs at first follow-up. After correction for the difference in AAPs at baseline, differences between the groups in the rate of AAPs at first follow-up and at the final examination were statistically significant. <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p> In view of the relatively low rate of AAPs at 6 years and the absence of CRC in group A, we consider a 6-year surveillance interval appropriate. A surveillance interval of 3 years might be considered in patients with AAPs and patients with \u2265 three adenomas. <\/jats:p><\/jats:sec>","DOI":"10.1200\/jco.2015.62.2035","type":"journal-article","created":{"date-parts":[[2015,11,3]],"date-time":"2015-11-03T03:24:17Z","timestamp":1446521057000},"page":"4188-4193","update-policy":"https:\/\/doi.org\/10.1200\/crossmark","source":"Crossref","is-referenced-by-count":33,"title":["Randomized Comparison of Surveillance Intervals in Familial Colorectal Cancer"],"prefix":"10.1200","volume":"33","author":[{"given":"Simone D.","family":"Hennink","sequence":"first","affiliation":[{"name":"Simone D. Hennink, Andrea E. van der Meulen-de Jong, Ron Wolterbeek, A. Stijn L.P. Crobach, Roeland A. Veenendaal, Hans Morreau, and Hans F.A. Vasen, Leiden University Medical Center; Wiet F.S.J. Crobach, W. Rogier ten Hove, and Anne M.C. Witte, Diaconessenhuis, Leiden; Marco C.J.M. Becx, St Antonius Hospital, Nieuwegein; Michiel van Haastert and Hugo J. Wolters, Martini Hospital; Jan H. Kleibeuker, University Medical Center Groningen, Groningen; Maarten A.C. Meijssen, Juda Vecht, Wouter H. de Vos tot..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea E.","family":"van der Meulen-de Jong","sequence":"additional","affiliation":[{"name":"Simone D. Hennink, Andrea E. van der Meulen-de Jong, Ron Wolterbeek, A. Stijn L.P. Crobach, Roeland A. Veenendaal, Hans Morreau, and Hans F.A. Vasen, Leiden University Medical Center; Wiet F.S.J. Crobach, W. Rogier ten Hove, and Anne M.C. Witte, Diaconessenhuis, Leiden; Marco C.J.M. Becx, St Antonius Hospital, Nieuwegein; Michiel van Haastert and Hugo J. Wolters, Martini Hospital; Jan H. Kleibeuker, University Medical Center Groningen, Groningen; Maarten A.C. Meijssen, Juda Vecht, Wouter H. de Vos tot..."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ron","family":"Wolterbeek","sequence":"additional","affiliation":[{"name":"Simone D. 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