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• W2787757633 endingPage "e0192658" @default.
• W2787757633 startingPage "e0192658" @default.
• W2787757633 abstract "Background Neither environmental nor genetic factors are sufficient to predict the transdiagnostic expression of psychosis. Therefore, analysis of gene-environment interactions may be productive. Objective A meta-analysis was performed using papers investigating the interaction between cannabis use and catechol-O-methyl transferase (COMT) polymorphism Val158Met (COMTVal158Met). Data sources PubMed, Embase, PsychInfo. Study eligibility criteria All observational studies assessing the interaction between COMTVal158Met and cannabis with any psychosis or psychotic symptoms measure as an outcome. Study appraisal and synthesis methods A meta-analysis was performed using the Meta-analysis of Observational Studies in Epidemiology guidelines and forest plots were generated. Thirteen articles met the selection criteria: 7 clinical studies using a case-only design, 3 clinical studies with a dichotomous outcome, and 3 studies analysing a continuous outcome of psychotic symptoms below the threshold of psychotic disorder. The three study types were analysed separately. Validity of the included studies was assessed using A Cochrane Risk of Bias Assessment Tool: for Non-Randomized Studies of Interventions. Results For case-only studies, a significant interaction was found between cannabis use and COMTVal158Met, with an OR of 1.45 (95% Confidence Interval = 1.05–2.00; Met/Met as the risk genotype). However, there was no evidence for interaction in either the studies including dichotomous outcomes (B = -0.51, 95% Confidence Interval -1.72, 0.70) or the studies including continuous outcomes (B = -0.04 95% Confidence Interval -0.16–0.08). Limitation A substantial part of the included studies used the case-only design, which has lower validity and tends to overestimate true effects. Conclusion The interaction term between cannabis use and COMTVal158Met was only statistically significant in the case-only studies, but not in studies using other clinical or non-clinical psychosis outcomes. Future additional high quality studies might change current perspectives, yet currently evidence for the interaction remains unconvincing." @default.
• W2787757633 created "2018-02-23" @default.
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• W2787757633 date "2018-02-14" @default.
• W2787757633 modified "2023-10-15" @default.
• W2787757633 title "The interaction between cannabis use and the Val158Met polymorphism of the COMT gene in psychosis: A transdiagnostic meta – analysis" @default.
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• W2787757633 doi "https://doi.org/10.1371/journal.pone.0192658" @default.
• W2787757633 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5812637" @default.
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