Use of Living Systematic Reviews (LSRS) Beyond COVID-19

ABSTRACT

Objectives: A LSR is a systematic review that is continually updated, incorporating new evidence as it becomes available. They are conducted in research areas where new evidence is constantly emerging on diagnostic methods, treatments, and outcomes. The objective of this study was to understand the current application of LSRs across research areas. Method(s) Embase, MEDLINE, and the Cochrane Database of Systematic Reviews were searched to identify LSRs. Only the most recent update of a LSR was included. Data regarding the indication, intervention, methods, frequency of updates, and funding were extracted. Result(s) Of the 1,243 records identified, 126 LSRs were included for analysis. The first LSR was published in 2015, with a significant increase in the number of LSRs published starting in 2020, coinciding with the COVID-19 pandemic. The most common indication represented by LSRs was COVID-19 (72%), followed by oncology (10%). Other indications with LSRs included chronic pain, traumatic brain injury, and skin disorders, among others. While most oncology LSRs identified interventional randomized-controlled trials (RCTs) (85%), only 54% of COVID-19 LSRs were restricted to interventional studies, including a combination of RCTS and real-world observational studies. Oncology LSRs included common cancers such as prostate, renal, or multiple myeloma. Of the reviews that reported update frequency, 28% planned monthly, 12% yearly, and 12% weekly updates. Only 46% of LSRs were registered. The majority of LSRs were funded by government or research organizations. Objectives of LSRs varied, with most stating the need to maintain up-to-date databases;however, several studies used LSRs to facilitate network meta-analysis or mixed treatment comparisons. Conclusion(s) While LSRs were introduced over five years ago, their frequency increased during the COVID-19 pandemic. Apart from COVID-19, LSRs are commonly used in oncology settings. LSRs provide high-level, relevant, and up-to-date evidence, making them a useful tool for clinical and real-world research.Copyright © 2023