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Article Abstract
Background: Negative symptoms in schizophrenia are associated with impairments in social and cognitive functioning leading to substantial long-term disability. Available antipsychotic treatments have demonstrated only modest benefit in the improvement of negative symptoms.
Objective: To compare improvements in negative symptoms among patients treated with paliperidone palmitate 3-month (PP3M) or paliperidone palmitate 1-month (PP1M) long-acting injectable (LAI) formulations.
Methods: Data from a randomized double-blind (DB), phase-3, non-inferiority study in patients with schizophrenia were analyzed. Following screening, patients entered a 17-week open-label (OL) phase to receive flexibly dosed PP1M followed by a 48-week DB phase where patients were randomized (1:1) to receive either PP1M or PP3M. Positive and Negative Syndrome Scale (PANSS) total scores with emphasis on 7-item negative subscale scores for PP1M vs PP3M were assessed.
Results: Of 1429 patients enrolled, 1016 were randomized to receive PP3M (n=504) or PP1M (n=512). At baseline, mean (SD) PANSS negative subscale was 23.2 (4.60) and negative symptom factor score was 22.3 (4.87), indicating moderate-to-severe negative symptoms. Negative subscale and symptoms factor scores showed continuous improvements throughout OL (15.9 [4.99]) and DB (14.9 [4.81]) phases. Mean (SD) changes from DB baseline in the PANSS negative subscale score were comparable between PP1M (-1.4 [3.67]) and PP3M (-1.4 [3.63]) treatment groups.
Conclusion: Treatment with PP3M or PP1M demonstrated comparable improvement in negative symptoms in patients with moderate-to-severe negative symptoms and in patients with prominent negative symptoms. Long-term treatment with PP3M demonstrated benefit, suggesting that continuous antipsychotic medication treatment for >1 year is needed to achieve greater benefit for negative symptoms.
Trial Registration: ClinicalTrials.gov Identifier: NCT01515423.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7064291 | PMC |
| http://dx.doi.org/10.2147/NDT.S226296 | DOI Listing |
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