Global Association of COVID-19 Pandemic Measures With Cancer Screening A Systematic Review and Meta-analysis

IMPORTANCE Public health services, including cancer screening tests, have been affected by the onset of the COVID-19 epidemic. OBJECTIVE To investigate the pandemic's association with cancer screening worldwide. Data Sources In this systematic review and meta-analysis, databases such as PubMed, ProQuest, and Scopus were searched comprehensively for articles published between January 1, 2020, and December 12, 2021. STUDY SELECTION Observational studies and articles that reported data from cancer registries that compared the number of screening tests performed before and during the pandemic for breast, cervical, and colorectal cancer were included. DATA EXTRACTION AND SYNTHESIS Two pairs of independent reviewers extracted data from the selected studies. The weighted average of the percentage variation was calculated between the 2 periods to assess the change in the number of cancer screening tests performed during the pandemic. Stratified analysis was performed by geographic area, period, and type of setting. The systematic review and meta-analysis was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) reporting guideline. MAIN OUTCOMES AND MEASURES The main outcome was the weighted average percentage variation in the number of screening tests performed between January and October 2020 compared with the previous period. RESULTS The review comprised 39 publications. There was an overall decrease of -46.7% (95% CI, -55.5% to -37.8%) for breast cancer screening, -44.9% (95% CI, -53.8% to -36.1%) for colorectal cancer screening, and -51.8% (95% CI, -64.7% to -38.9%) for cervical cancer screening during the pandemic. For all 3 cancers, a U-shaped temporal trend was identified; for colorectal cancer, a significant decrease was still apparent after May 2020 (in June to October, the decrease was -23.4% [95% CI, -44.4% to -2.4%]). Differences by geographic area and screening setting were also identified. CONCLUSIONS AND RELEVANCE A summary estimate of the downscaling of cancer screening tests since the onset of the COVID-19 pandemic is provided in this systematic review and meta-analysis. This could be associated with an increase in the number of avoidable cancer deaths. Effective interventions are required to restore the capacity of screening services to the prepandemic level.

Automated summary

This study investigates the impact of the COVID-19 pandemic on cancer screening globally. The results show a significant decrease in the number of screening tests for breast, colorectal, and cervical cancer during the pandemic. This decrease may be associated with an increase in avoidable cancer deaths. Effective interventions are needed to restore the screening services to pre-pandemic levels.