Implementing Strategies at the Workplace Level to Increase Colorectal Cancer Screening Uptake in Argentina: A Controlled Interrupted Time-series Study

Colorectal cancer is the third most common neoplasm. The immunochemical fecal occult blood test (iFOBT) is recommended for screening. The worksite setting has great potential to deliver preventive interventions. We aimed to design and evaluate the feasibility and potential impact of a multicomponent strategy in a workplace [Internal Revenue Agency of the Province of Buenos Aires (ARBA from its acronym in Spanish "Agencia de Recaudacion de Buenos Aires") in Argentina]. We used a quasi-experimental research design, a controlled interrupted time-series (ITS). The study involved: (i) a preintervention period (July 2015-September 2018); and (ii) an intervention period (October 2018-February 2019). We used semi-structured interviews and focus groups to design the intervention and to ensure feasibility and implementability. We fitted segmented linear regression models to evaluate changes in the monthly rates per 10,000 tests done in ARBA employees and controlling for the proportion of tests done in non-ARBA workers. A total of 1,552 ARBA employees aged 50 or more participated. Overall, iFOBT mean uptake rates were 16 times higher in the intervened during the five-month intervention period, remaining statistically significant after adjusting by the proportion of tests done in the control group (P < 0.001). The effect was higher in women aged 50 to 59 years. Activities were suspended due to the COVID-19 pandemic. A multifaceted workplacebased intervention proved to be feasible and acceptable to increase the uptake of colorectal cancer screening in employees of Argentina. Achieving high implementation rates requires building a healthy relationship with the partner organization, adding their values and views, and establishing agreed-upon mechanisms. Prevention Relevance: Employee-facing multifaceted worksite cancer screening interventions are a valuable means to increase knowledge and utilization of workers. The controlled ITS showed that colorectal cancer screening mean uptake rates were 16 times higher in the intervened versus the control population during the intervention period, particularly among women aged 50 to 75.