A cluster randomised trial of strategies to increase cervical screening uptake at first invitation (STRATEGIC)
Authors: Kitchener Henry C , Gittins Matthew , Rivero-Arias Oliver , Tsiachristas Apostolos , Cruickshank Margaret , Gray Alastair , Brabin Loretta , Torgerson David , Crosbie Emma J , Sargent Alexandra , Roberts Chris 
Published: September 2016

Background

Falling participation by young women in cervical screening has been observed at a time that has seen an increase in the incidence of cervical cancer in the UK in women aged < 35 years. Various barriers to screening have been documented, including fear, embarrassment and inconvenience.

Objectives

To measure the feasibility, clinical effectiveness and cost-effectiveness of a range of interventions to increase the uptake of cervical screening among young women.

Design

A cluster randomised trial based on general practices performed in two phases.

Setting

Primary care in Greater Manchester and the Grampian region in Scotland.

Participants

Phase 1: 20,879 women receiving their first invitation for cervical screening. Phase 2: 10,126 women who had not attended by 6 months.

Interventions

Phase 1: pre-invitation leaflet or not, and access to online booking (Manchester only). Phase 2: (1) vaginal self-sampling kits (SSKs) sent unrequested (n = 1141); or (2) offered on request (n = 1290); (3) provided with a timed appointment (n = 1629); (4) offered access to a nurse navigator (NN) (n = 1007); or (5) offered a choice between a NN or a SSK (n = 1277); and 3782 women in control practices.

Main outcome measures

Uplift in screening compared with control practices, cost-effectiveness of interventions, and the women’s preferences explored in a discrete choice experiment.

Results

The pre-invitation leaflet and offer of online booking were ineffective when compared with control practices at 3 months, 18.8% versus 19.2% [odds ratio (OR) 0.96, 95% confidence interval (CI) 0.88 to 1.06;p = 0.485] and 17.8% versus 17.2% (OR 1.02, 95% CI 0.87 to 1.20;p = 0.802), respectively. The uptake of screening at 3 months was higher among previously human papillomavirus (HPV)-vaccinated women than unvaccinated women, 23.7% versus 11% (OR 2.07, 95% CI 1.69 to 2.53;p < 0.001). Among non-attenders, the SSK sent intervention showed a statistically significant increase in uptake at 12 months post invitation, 21.3% versus 16.2% (OR 1.51, 95% CI 1.20 to 1.91;p = 0.001), as did timed appointments, 19.8% versus 16.2% (OR 1.41, 95% CI 1.14 to 1.74;p = 0.001). The offer of a NN, a SSK on request, and a choice between timed appointments and NN were ineffective. Overall, there was a gradual rather than prompt response, as demonstrated by uptake among control practices. A discrete choice experiment indicated that women invited who had not yet attended valued the attributes inherent in self-sampling. The health economic analysis showed that both timed appointments and unsolicited SSK sent were likely to be cost-effective at a cost per quality-adjusted life-year (QALY) gained of £7593 and £8434, respectively, if extended across the national 25-year-old cohort throughout the duration of screening. The certainty of these being cost-effective at a ceiling ratio of £20,000 per QALY gained was > 90%.

Conclusion

Women receiving their initial screening invitation frequently delay taking up the offer and the net impact of interventions was small. Timed appointments and SSKs sent to non-attenders at 6 months are likely to be a cost-effective means of increasing uptake and should be considered further. HPV vaccination in the catch-up programme was associated with an increased uptake of cervical screening. Future work should focus on optimising self-sampling in terms of age range, timing of offer for non-attenders and use of urine testing instead of vaginal samples.

Trial registration

Current Controlled Trials ISRCTN52303479.

Funding

This project was funded by the NIHR Health Technology Assessment programme and will be published in full inHealth Technology Assessment; Vol. 20, No. 68. See the NIHR Journals Library website for further project information.