Global 
Deutschland Colon to Rectum
Lancet. 2025;405(10484):1081-1092
Behavioural interventions to increase uptake of FIT colorectal screening in Scotland (TEMPO): A nationwide, 8-arm, factorial, randomised controlled trial
Background: Uptake of colorectal cancer screening is suboptimal. The TEMPO trial evaluated the impact of 2 evidence-based, theory-informed, and co-designed behavioural interventions on uptake of faecal immunochemical test (FIT) colorectal screening.
Methods: TEMPO was a 2 × 4 factorial, 8-arm, randomised controlled trial embedded in the nationwide Scottish Bowel Screening Programme. All 40,000 consecutive adults (aged 50–74 years) eligible for colorectal screening were allocated to 1 of 8 groups using block randomisation: (1) standard invitation; (2) 1-week suggested FIT return deadline; (3) 2-week deadline; (4) 4-week deadline; (5) problem-solving planning tool (no deadline); (6) planning tool plus 1-week deadline; (7) planning tool plus 2-week deadline; (8) planning tool plus 4-week deadline. The primary outcome was the proportion of FITs returned correctly completed to be tested by the colorectal screening laboratory providing a positive or negative result, within 3 months of the FIT being mailed to a person.
Findings: From June 19 to July 3, 2022, 5000 participants were randomly assigned per group, with no loss to follow-up. 266 participants met the exclusion criteria; 39 734 (19,909 [50.1%] female and 19,825 [49.9%] male; mean age 61.2 [standard deviation 7.3] years) were included in the analysis. The control group (no deadline, and no planning tool) had a 3-month FIT return rate of 66.0% (3275/4965). The highest return rate was seen with a 2-week deadline without the planning tool (3376/4964 [68.0%]; difference vs. control of 2.0% [95% CI: 0.2–3.9]). The lowest return rate was seen when the planning tool was given without a deadline (3134/4958 [63.2%]; difference vs. control of -2.8% [95% CI: -4.7 to -0.8]). The primary analysis, assuming independent effects of the 2 interventions, suggested a clear positive effect of giving a deadline (adjusted odds ratio [aOR] = 1.13 [95% CI: 1.08–1.19]; p < 0.0001), and no effect for use of a planning tool (aOR = 0.98 [95% CI: 0.94–1.02]; p = 0.34), though this was complicated by an interaction between the 2 interventions (pinteraction = 0.0041); among those who were given a deadline, there was no evidence that receiving a planning tool had any effect (aOR = 1.02 [95% CI: 0.97–1.07]; p = 0.53), but in the absence of a deadline, giving the planning tool appeared detrimental (aOR = 0.88 [95% CI: 0.81–0.96]; p = 0.0030). In the absence of the planning tool, there was little evidence that the use of a deadline had any effect on return rates at 3 months. However, secondary analyses indicated that the use of deadlines boosted earlier return rates (within 1, 2, and 4 weeks, particularly around the time of the deadline), and reduced the need to issue a reminder letter after 6 weeks, with no evidence that the planning tool had any positive impact, and without evidence of interactions between interventions.
Interpretation: Adding a single sentence suggesting a deadline for faecal immunochemical testing (FIT) return in the invitation letter to FIT colorectal screening resulted in more timely FIT return and reduced the need to issue reminder letters. This is a highly cost-effective intervention that could be easily implemented in routine practice. A planning tool had no positive effect on FIT return.