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  • Title: A randomized, placebo-controlled, phase 2 trial of laquinimod in primary progressive multiple sclerosis.
    Author: Giovannoni G, Knappertz V, Steinerman JR, Tansy AP, Li T, Krieger S, Uccelli A, Uitdehaag BMJ, Montalban X, Hartung HP, Pia Sormani M, Cree BAC, Lublin F, Barkhof F.
    Journal: Neurology; 2020 Aug 25; 95(8):e1027-e1040. PubMed ID: 32651286.
    Abstract:
    OBJECTIVE: To evaluate efficacy, safety, and tolerability of laquinimod in patients with primary progressive multiple sclerosis (PPMS). METHODS: In the randomized, double-blind, placebo-controlled, phase 2 study, ARPEGGIO (A Randomized Placebo-controlled Trial Evaluating Laquinimod in PPMS, Gauging Gradations in MRI and Clinical Outcomes), eligible patients with PPMS were randomized 1:1:1 to receive once-daily oral laquinimod 0.6 mg or 1.5 mg or matching placebo. Percentage brain volume change (PBVC; primary endpoint) from baseline to week 48 was assessed by MRI. Secondary and exploratory endpoints included clinical and MRI measures. Efficacy endpoints were evaluated using a predefined, hierarchical statistical testing procedure. Safety was monitored throughout the study. The laquinimod 1.5 mg dose arm was discontinued on January 1, 2016, due to findings of cardiovascular events. RESULTS: A total of 374 patients were randomized to laquinimod 0.6 mg (n = 139) or 1.5 mg (n = 95) or placebo (n = 140). ARPEGGIO did not meet the primary endpoint of significant treatment effect with laquinimod 0.6 mg vs placebo on PBVC from baseline to week 48 (adjusted mean difference = 0.016%, p = 0.903). Laquinimod 0.6 mg reduced the number of new T2 brain lesions at week 48 (risk ratio 0.4; 95% confidence interval, 0.26-0.69; p = 0.001). Incidence of adverse events was higher among patients treated with laquinimod 0.6 mg (83%) vs laquinimod 1.5 mg (66%) and placebo (78%). CONCLUSIONS: Laquinimod 0.6 mg did not demonstrate a statistically significant effect on brain volume loss in PPMS at week 48. CLINICALTRIALSGOV IDENTIFIER: NCT02284568. CLASSIFICATION OF EVIDENCE: This study provides Class I evidence that, although well tolerated, laquinimod 0.6 mg did not demonstrate a significant treatment effect on PBVC in patients with PPMS.
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