Efficacy of clozapine versus second-generation antipsychotics in people with treatment-resistant schizophrenia: a systematic review and individual patient data meta-analysis

IF 30.8 1区 医学 Q1 PSYCHIATRY
Johannes Schneider-Thoma, Tasnim Hamza, Konstantina Chalkou, Spyridon Siafis, Shimeng Dong, Irene Bighelli, Wulf-Peter Hansen, Elfriede Scheuring, John M Davis, Josef Priller, Pierre Baumann, Robert Conley, Joachim Cordes, Deanna Kelly, Michael Kluge, Sanjiv Kumra, Shôn Lewis, Herbert Y Meltzer, Dieter Naber, Nina Schooler, Stefan Leucht
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引用次数: 0

Abstract

Background

Clozapine is recommended by national and international guidelines for people with treatment-resistant schizophrenia. However, available meta-analyses of randomised controlled trials have not shown superior efficacy of clozapine when compared with other second-generation antipsychotics, with heterogeneity identified between the original studies. We aimed to use individual patient data (IPD) to account for potential reasons of variability and to synthesise an adjusted estimate for the difference in efficacy between clozapine and other second-generation antipsychotics for treatment-resistant schizophrenia.

Methods

In this systematic review and IPD meta-analysis, we searched the Cochrane Schizophrenia Group's Study-Based Register from inception to Jan 24, 2024, and previous reviews for blinded randomised controlled trials comparing clozapine with other second-generation antipsychotics in participants with treatment-resistant schizophrenia. Trials were eligible if they included patients with treatment-resistant schizophrenia and had a duration of at least 6 weeks. IPD were requested from trial investigators. The primary outcome was change in overall schizophrenia symptoms as measured by the Positive and Negative Syndrome Scale (PANSS) between clozapine and other second-generation antipsychotics after 6–8 weeks of treatment. The effect size measure for the primary outcome was mean difference with 95% credible interval (CrI). We fitted a Bayesian random-effects IPD meta-regression model that included duration of illness, baseline severity, and sex as potential prognostic factors or treatment effect modifiers. Confidence in the evidence was assessed using Grading of Recommendations, Assessment, Development, and Evaluation (GRADE). People with lived experience of mental illness were involved in this study. This study is registered with PROSPERO, CRD42021254986.

Findings

We screened 13 876 references and included 19 studies with data for 1599 participants; IPD were available for 12 of 19 trials (n=1052; mean age 37·67 years [SD 11·24; range 10–66]; 348 [33·08%] women and 704 [66·92%] men). Data on ethnicity were not available. The estimated mean difference in change from baseline PANSS total score was –0·64 points (95% CrI –3·97 to 2·63; τ=2·68) in favour of other second-generation antipsychotics. Shorter duration of illness and higher baseline severity were prognostic factors associated with a larger reduction in symptoms, but neither those factors nor sex were found to modify the relative effect between clozapine and other second-generation antipsychotics. The confidence in the evidence was graded as very low.

Interpretation

This IPD meta-analysis found a small and uncertain advantage of other second-generation antipsychotics, mainly olanzapine and risperidone, and so did not provide evidence for superior efficacy of clozapine compared with other second-generation antipsychotics in treatment-resistant schizophrenia. It is limited by unavailability of IPD for some studies, uncaptured sources of variance, and uncertainty due to premature study discontinuation. Given the side-effects of clozapine, the observed uncertainty regarding clozapine's superiority warrants prudent use and further research.

Funding

German Ministry of Education and Research.
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来源期刊
Lancet Psychiatry
Lancet Psychiatry PSYCHIATRY-
CiteScore
58.30
自引率
0.90%
发文量
0
期刊介绍: The Lancet Psychiatry is a globally renowned and trusted resource for groundbreaking research in the field of psychiatry. We specialize in publishing original studies that contribute to transforming and shedding light on important aspects of psychiatric practice. Our comprehensive coverage extends to diverse topics including psychopharmacology, psychotherapy, and psychosocial approaches that address psychiatric disorders throughout the lifespan. We aim to channel innovative treatments and examine the biological research that forms the foundation of such advancements. Our journal also explores novel service delivery methods and promotes fresh perspectives on mental illness, emphasizing the significant contributions of social psychiatry.
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