Association between fish intake and glioma risk: a systematic review and meta-analysis.

Objectives: We investigated the association between the consumption of fresh and processed fish and glioma risk using a meta-analysis approach.

Methods: We selected and analyzed observational studies that discussed the relationships between fresh and processed fish intake on glioma risk from PubMed, Web of Science, Embase, and the SinoMed and Wanfang databases from inception to 31 March 2020. Studies were selected according to pre-established eligibility criteria and data were extracted separately by two researchers.