More vs Less Frequent Follow-Up Testing and 10-Year Mortality in Patients With Stage II or III Colorectal Cancer
Authors: Sørensen Henrik Toft , Horváth-Puhó Erzsébet , Petersen Sune Høirup , Wille-Jørgensen Peer , Syk Ingvar ,   COLOFOL Study Group, Laurberg Søren , Renehan Andrew , Smedh Kenneth , Andersen Per Vadgaard , Christensen Henrik , Gandrup Per , Jess Per , Madsen Mogens Rørbæk , Pedersen Allan Gorm , Østergaard Erling , Andersson Pernilla Hansdotter , Bengtsson Jonas , Bragmark Mats , Buchwald Pamela , Egenvall Monica , Farahnak Parastau , Folkesson Joakim , Goldinger Michael , Heuman Rolf , Lindberg Kenneth , Martling Anna , Näsvall Pia , Ottosson Johan , Sandzén Birger , Barberousse Carlos 
Published: November 2024

ImportanceAlthough intensive follow-up of patients after curative surgery for colorectal cancer is common in clinical practice, evidence for a long-term survival benefit of more frequent testing is limited.ObjectiveTo examine overall and colorectal cancer–specific mortality rates in patients with stage II or III colorectal cancer who underwent curative surgery and underwent high-frequency or low-frequency follow-up testing.Design, Setting, and ParticipantsThis randomized clinical trial with posttrial prespecified follow-up was performed in 23 centers in Sweden and Denmark. The original study enrolled 2509 patients with stage II or III colorectal cancer from Sweden, Denmark, and Uruguay (1 center) who received treatment from January 1, 2006, through December 31, 2010, and were followed up for up to 5 years. The participants from Sweden and Denmark were then followed up for 10 years through population-based health registries. The 53 patients from Uruguay were not included in the posttrial follow-up. Statistical analysis was performed from March to June 2024.InterventionsPatients were randomly allocated to follow-up testing with computed tomography (CT) scans and serum carcinoembryonic antigen (CEA) screening at 6, 12, 18, 24, and 36 months after surgery (high-frequency group; 1227 patients), or at 12 and 36 months after surgery (low-frequency group, 1229 patients).Main Outcomes and MeasuresThe outcomes were 10-year overall mortality and colorectal cancer–specific mortality rates. Both intention-to-treat and per-protocol analyses were performed.ResultsOf the 2555 patients who were randomly allocated, 2509 were included in the intention-to-treat analysis, of whom 2456 (97.9%) were included in this posttrial analysis (median age, 65 years [IQR, 59-70 years]; 1355 male patients [55.2%]). The 10-year overall mortality rate for the high-frequency group was 27.1% (333 of 1227; 95% CI, 24.7%-29.7%) compared with 28.4% (349 of 1229; 95% CI, 26.0%-31.0%) in the low-frequency group (risk difference, 1.3% [95% CI, −2.3% to 4.8%]). The 10-year colorectal cancer–specific mortality rate in the high-frequency group was 15.6% (191 of 1227; 95% CI, 13.6%-17.7%) compared with 16.0% (196 of 1229; 95% CI, 14.0%-18.1%) in the low-frequency group (risk difference, 0.4% [95% CI, −2.5% to 3.3%]). The same pattern resulted from the per-protocol analysis.Conclusions and RelevanceAmong patients with stage II or III colorectal cancer, more frequent follow-up testing with CT scans and CEA testing did not result in a significant reduction in 10-year overall mortality or colorectal cancer–specific mortality. The results of this trial should be considered as the evidence base for updating clinical guidelines.Trial RegistrationClinicalTrials.gov Identifier: NCT00225641