Objective To evaluate the efficacy and safety of intramuscular ultra-high-dose methylcobalamin in patients with amyotrophic lateral sclerosis (ALS).
Methods 373 patients with ALS (El Escorial definite or probable; laboratory-supported probable; duration ≤36 months) were randomly assigned to placebo, 25 mg or 50 mg of methylcobalamin groups. The primary endpoints were the time interval to primary events (death or full ventilation support) and changes in the Revised ALS Functional Rating Scale (ALSFRS-R) score from baseline to week 182. Efficacy was also evaluated using post-hoc analyses in patients diagnosed early (entered ≤12 months after symptom onset).
Results No significant differences were detected in either primary endpoint (minimal p value=0.087). However, post-hoc analyses of methylcobalamin-treated patients diagnosed and entered early (≤12 months’ duration) showed longer time intervals to the primary event (p<0.025) and less decreases in the ALSFRS-R score (p<0.025) than the placebo group. The incidence of treatment-related adverse events was similar and low in all groups.
Conclusion Although ultra-high-dose methylcobalamin did not show significant efficacy in the whole cohort, this treatment may prolong survival and retard symptomatic progression without major side effects if started early.
Trial registration number NCT00444613.
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Contributions RK designed the study, interpreted the data and drafted the manuscript. TI designed the study. YI designed the study. KO designed the study. MN designed the study. YO designed the study and performed the statistical analysis. TT designed the study, performed the statistical analysis, interpreted the data and drafted the manuscript. TH interpreted the data and drafted the manuscript. HS designed the study, interpreted the data and drafted the manuscript. KT designed the study and interpreted the data. SK designed the study and interpreted the data.
Funding This study was funded by Eisai.
Competing interests RK received grants from Eisai during the conduct of the study and has a patent on the Method of treating amyotrophic lateral sclerosis (US 20130344081 A1 licensed). TI received grants from Eisai during the conduct of the study. YI reports no disclosures. KO reports no disclosures. MN reports no disclosures. YO received personal fees from Statcom, Sanofi, Eisai, Chugai, Taiho, Shionogi and Kowa, and non-financial support from Yakult Honsha and Takeda outside the submitted work. TT is employed by Eisai. TH is employed by Eisai. HS is employed by Eisai. KT received grants from Eisai during the conduct of the study. SK received grants from Eisai during the conduct of the study.
Patient consent for publication Not required.
Ethics approval This study is conducted in accordance with the principles of the Declaration of Helsinki. The protocol was approved by the institutional review board at each centre. All eligible patients provided written informed consent.
Provenance and peer review Not commissioned; externally peer reviewed.
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