At
least 81% of participants in each of the studies and at least 90% of
the participants in three studies (AFPPS, ukCAP, and APACC)
had at least one follow-up examination ( Supplementary Table 1 ,
available online). (The early termination of CALGB 9270 contributed
to the lower percentage of participants with colonoscopic
follow-up in that study.) In total, 2698 participants underwent
colonoscopic follow-up. The remaining 269 participants were