The outcomes measured and reported in intracranial meningioma clinical trials: a systematic review

Meningioma clinical trials have assessed interventions including surgery, radiotherapy, and pharmacotherapy. However, agreement does not exist on what, how, and when outcomes of interest should be measured. To do so would allow comparative analysis of similar trials. This systematic review aimed to summarise the outcomes measured and reported in meningioma clinical trials. Systematic literature and trial registry searches were performed to identify published and ongoing intracranial meningioma clinical trials (PubMed, EMBASE, MEDLINE, CINAHL via EBSCO, and Web of Science, completed 22nd Jan 22). Reported outcomes were extracted verbatim, along with an associated definition and method of measurement if provided. Verbatim outcomes were deduplicated and the resulting unique outcomes grouped under standardised outcome terms. These were classified using the taxonomy proposed by the ‘Core Outcome Measures in Effectiveness Trials’ (COMET) initiative. Thirty published articles and 18 ongoing studies were included, describing 47 unique clinical trials: phase 2 n=33, phase 3 n=14. Common interventions included: surgery n=13, radiotherapy n=8, and pharmacotherapy n=20. In total, 659 verbatim outcomes were reported, of which 84 were defined. Following de-duplication, 415 unique verbatim outcomes remained and were grouped into 115 standardised outcome terms. These were classified using the COMET taxonomy into 29 outcome domains and 5 core areas. Outcome measurement across meningioma clinical trials is heterogeneous. The standardised outcome terms identified will be prioritised through an eDelphi survey and consensus meeting of key stakeholders (including patients), in order to develop a Core Outcome Set (COS) for use in future meningioma clinical trials.