Participation in clinical trials increases the detection of pre-malignant lesions during colonoscopy

Alexandre Oliveira Ferreira, Maria Pia Costa-Santos, Catarina Gomes, Bárbara Morão, Luisa Glória, Marília Cravo, Mário Dinis-Ribeiro, Jorge Canena

Research output: Contribution to journalArticlepeer-review


BACKGROUND: colorectal adenoma detection has been associated with the effectiveness of cancer prevention. Clinical trials have been designed to determine the role of several interventions to increase the detection of pre-malignant lesions. We hypothesized that colonoscopy in the setting of clinical trials has a higher pre-malignant lesion detection rate. METHODS: a cross-sectional study was performed that compared the detection of pre-malignant lesions in 147 randomly sampled non-research colonoscopies and 294 from the control group of two prospective trials. Outpatients aged 40-79 years, with no personal history of colorectal cancer (CRC) were included. RESULTS: baseline characteristics were similar between the two groups. The pre-malignant lesion detection rate in the trial vs control group was 65.6 % vs 44.2 % (OR 2.411; 95 % CI: 1.608-3.614; p < 0.001), the polyp detection rate was 73.8 % vs 59.9 % (OR 1.889; 95 % CI: 1.242-2.876; p = 0.003), the adenoma detection rate was 62.6 % vs 44.2 % (OR 2.110; 95 % CI: 1.411-3.155; p < 0.001) and the sessile serrated lesion detection rate was 17 % vs 4.1 % (OR 4.816; 95 % CI: 2.014-11.515; p < 0.001). The mean number of pre-malignant and sessile serrated lesions was 1.70 vs 1.06 (p = 0.002) and 0.32 vs 0.06 (p = 0.001) lesions per colonoscopy, respectively. There was no significant change in any of the study outcomes according to the multivariate analysis with each single potential confounder. CONCLUSIONS: patients involved in colonoscopy trials may benefit from higher quality examinations, as shown by the higher detection rates. Institutions should consider supporting clinical research in colonoscopy as a simple means to improve colonoscopy quality and colorectal cancer prevention.

Original languageEnglish
Pages (from-to)323-328
Number of pages6
JournalRevista espanola de enfermedades digestivas : organo oficial de la Sociedad Espanola de Patologia Digestiva
Issue number6
Publication statusPublished - 1 Jun 2022


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