Serial SMS Reminders and an Opt-out Mailed FIT Kits to Improve Colorectal Screening Participation: A Single Center RCT

It is estimated that colorectal cancer (CRC) screening can reduce the risk of dying from bowel cancer by approximately 15%. Yet despite this, the national participation rate is only approximately 62.9%, highlighting that the national target of 70.5% set out in the Healthy People 2020 Objectives remains well out of reach. The US Preventative Task Force (USPSTF) recommends colorectal screening for adults aged 50-75 years through either annual fecal occult blood testing (FOBT), flexible sigmoidoscopy every 5 years or colonoscopy every 10 years. However, many service providers rely on the opportunistic offer of screening at existing health touch-points. This requires the patient to see their healthcare provider, usually for a different clinical reason, the provider to recognize that the patient is overdue for CRC screening and the provider to recommend and book the patient for CRC screening. This process identifies a number of barriers encountered at the system, provider and patient level, to completing a screening test regularly. Furthermore, much evidence indicates that public participation in colorectal screening is heavily influences by socioeconomic factors. Lower participation rates are seen in individuals without health insurance, without a medical home, who are more deprived and from ethnic minority groups. These individuals are more likely to present with later stage disease and experience poorer outcomes. Fecal immunochemistry testing (FIT) is a stool sample based test kit that uses antibodies to detect the human haemoglobin protein in the stool sample and can be completed in the privacy of the home. Research has showed that mailed home test kits such as FOBT or FIT kits can improve CRC participation by reducing the effort required to see a provider in order to arrange CRC screening. Evidence has also shown that text message reminders can improve participation in cancer screening. Furthermore, the message content of text messages can differentially change behavior, for example reducing the 'did not attend rate' in hospital outpatient appointments but also in the context of participation in cervical cancer screening. Therefore this trial will test a multimodal outreach approach, which uses serial SMS reminders with different word contents and mailed FIT kits on the participation rates of CRC screening.