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Meta-Analysis
. 2015 Dec 11;2015(12):CD011952.
doi: 10.1002/14651858.CD011952.

Ascorbic acid for the treatment of Charcot-Marie-Tooth disease

Affiliations
Meta-Analysis

Ascorbic acid for the treatment of Charcot-Marie-Tooth disease

Burkhard Gess et al. Cochrane Database Syst Rev. .

Abstract

Background: Charcot-Marie-Tooth disease (CMT) comprises a large group of different forms of hereditary motor and sensory neuropathy. The molecular basis of several CMT subtypes has been clarified during the last 20 years. Since slowly progressive muscle weakness and sensory disturbances are the main features of these syndromes, treatments aim to improve motor impairment and sensory disturbances to improve abilities. Pharmacological treatment trials in CMT are rare. This review was derived from a Cochrane review, Treatment for Charcot Marie Tooth disease, which will be updated via this review and a forthcoming title, Treatments other than ascorbic acid for Charcot-Marie-Tooth disease.

Objectives: To assess the effects of ascorbic acid (vitamin C) treatment for CMT.

Search methods: On 21 September 2015, we searched the Cochrane Neuromuscular Specialised Register, Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE and LILACS for randomised controlled trials (RCTs) of treatment for CMT. We also checked clinical trials registries for ongoing studies.

Selection criteria: We included RCTs and quasi-RCTs of any ascorbic acid treatment for people with CMT. Where a study aimed to evaluate the treatment of general neuromuscular symptoms of people with peripheral neuropathy including CMT, we included the study if we were able to identify the effect of treatment in the CMT group. We did not include observational studies or case reports of ascorbic acid treatment in people with CMT.

Data collection and analysis: Two review authors (BG and JB) independently extracted the data and assessed study quality.

Main results: Six RCTs compared the effect of oral ascorbic acid (1 to 4 grams) and placebo treatment in CMT1A. In five trials involving adults with CMT1A, a total of 622 participants received ascorbic acid or placebo. Trials were largely at low risk of bias. There is high-quality evidence that ascorbic acid does not improve the course of CMT1A in adults as measured by the CMT neuropathy score (0 to 36 scale) at 12 months (mean difference (MD) -0.37; 95% confidence intervals (CI) -0.83 to 0.09; five studies; N = 533), or at 24 months (MD -0.21; 95% CI -0.81 to 0.39; three studies; N = 388). Ascorbic acid treatment showed a positive effect on the nine-hole peg test versus placebo (MD -1.16 seconds; 95% CI -1.96 to -0.37), but the clinical significance of this result is probably small. Meta-analyses of other secondary outcome parameters showed no relevant benefit of ascorbic acid. In one trial, 80 children with CMT1A received ascorbic acid or placebo. The trial showed no clinical benefit of ascorbic acid treatment. Adverse effects did not differ in their nature or abundance between ascorbic acid and placebo.

Authors' conclusions: High-quality evidence indicates that ascorbic acid does not improve the course of CMT1A in adults in terms of the outcome parameters used. According to low-quality evidence, ascorbic acid does not improve the course of CMT1A in children. However, CMT1A is slowly progressive and the outcome parameters show only small change over time. Longer study durations should be considered, and outcome parameters more sensitive to change over time should be designed and validated for future studies.

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Conflict of interest statement

MM Reilly and D Pareyson were involved as investigators in one of the trials included in this review (Pareyson 2011). B Gess and P Young have been involved in basic research projects on the function of ascorbic acid in the peripheral nervous system (Gess 2010; Gess 2011).

Figures

1
1
Study flow diagram.
2
2
Risk of bias summary: review authors' judgements about each risk of bias item for each included study. Green (+) = low risk of bias; yellow (?) = unclear risk of bias; red (‐) = high risk of bias.
3
3
Forest plot of comparison: 1 Ascorbic acid versus placebo 12 months, outcome: 1.1 CMTNS.
4
4
Forest plot of comparison: 1 Ascorbic acid versus placebo 12 months (adults), outcome: 1.21 9‐hole peg test [s].
5
5
Forest plot of comparison: 2 Ascorbic acid versus placebo 24 months (adults), outcome: 2.1 Impairment ‐ CMTNS.
6
6
Forest plot of comparison: 2 Ascorbic acid versus placebo 24 months (adults), outcome: 2.11 Impairment ‐ 9‐hole peg test [s].
1.1
1.1. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 1 Impairment ‐ CMTNS (scale 0 to 36 points).
1.2
1.2. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 2 Impairment ‐ CMTES (scale 0 to 28 points).
1.3
1.3. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 3 Impairment ‐ NIS (scale ‐26 to 26 points).
1.4
1.4. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 4 Disability ‐ ODSS (scale 0 to 12 points).
1.5
1.5. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 5 Disability ‐ ONLS (scale 0 to 12 points).
1.6
1.6. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 6 Disability ‐ ALDS (scale 0 to 100 points).
1.7
1.7. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 7 CMAP, ulnar nerve (abductor digiti minimi).
1.8
1.8. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 8 CMAP, median nerve (abductor pollicis brevis).
1.9
1.9. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 9 CMAP summatory from ulnar, median and peroneal nerves.
1.10
1.10. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 10 Sensation ‐ INCAT Sensory Sum score (scale 0 to 20 points).
1.11
1.11. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 11 SNAP amplitude.
1.12
1.12. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 12 Hand grip.
1.13
1.13. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 13 Three‐point pinch.
1.14
1.14. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 14 Foot dorsiflexion.
1.15
1.15. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 15 Quality of life ‐ SF36 ‐ physical functioning.
1.16
1.16. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 16 Quality of life ‐ SF36 ‐ bodily pain.
1.17
1.17. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 17 Quality of life ‐ SF36 ‐ energy.
1.18
1.18. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 18 Quality of life ‐ SF36 ‐ psychological.
1.19
1.19. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 19 Quality of life ‐ SF36 ‐ MCS.
1.20
1.20. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 20 Quality of life ‐ SF36 ‐ PCS.
1.21
1.21. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 21 9‐hole peg test.
1.22
1.22. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 22 Timed 10 m walk.
1.23
1.23. Analysis
Comparison 1 Ascorbic acid versus placebo 12 months (adults), Outcome 23 50 m walk.
2.1
2.1. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 1 Impairment ‐ CMTNS (scale 0 to 36 points).
2.2
2.2. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 2 Impairment ‐ CMTES (scale 0 to 28 points).
2.3
2.3. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 3 Disability ‐ ONLS (scale 0 to 12 points).
2.4
2.4. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 4 CMAP, ulnar nerve (abductor digiti minimi).
2.5
2.5. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 5 Hand grip.
2.6
2.6. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 6 Three‐point pinch.
2.7
2.7. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 7 Foot dorsiflexion.
2.8
2.8. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 8 Quality of life ‐ SF36 ‐ physical functioning.
2.9
2.9. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 9 Quality of life ‐ SF36 ‐ bodily pain.
2.10
2.10. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 10 Quality of life ‐ SF36 ‐ energy.
2.11
2.11. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 11 9‐hole peg test.
2.12
2.12. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 12 Timed 10 m walk.
2.13
2.13. Analysis
Comparison 2 Ascorbic acid versus placebo 24 months (adults), Outcome 13 PMP22 mRNA (skin biopsy).
3.1
3.1. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 1 CMAP amplitude (M. abductor pollicis brevis).
3.2
3.2. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 2 Hand grip.
3.3
3.3. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 3 Finger pinch.
3.4
3.4. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 4 Foot dorsiflexion.
3.5
3.5. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 5 Foot plantar flexion.
3.6
3.6. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 6 Median nerve motor conduction velocity.
3.7
3.7. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 7 9‐hole peg test.
3.8
3.8. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 8 6 min walk.
3.9
3.9. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 9 Balance.
3.10
3.10. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 10 Agility.
3.11
3.11. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 11 Long jump.
3.12
3.12. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 12 Speed.
3.13
3.13. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 13 Cadence.
3.14
3.14. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 14 Step time.
3.15
3.15. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 15 Step length.
3.16
3.16. Analysis
Comparison 3 Ascorbic acid vs placebo (children), Outcome 16 Stride length.

References

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References to other published versions of this review

Young 2006
    1. Young P, Stögbauer F, Butterfass‐Bahloul T, Jonghe P. Treatment for Charcot‐Marie‐Tooth disease. Cochrane Database of Systematic Reviews 2006, Issue 2. [DOI: 10.1002/14651858.CD006052] - DOI - PMC - PubMed
Young 2008
    1. Young P, Jonghe P, Stögbauer F, Butterfass‐Bahloul T. Treatment for Charcot‐Marie‐Tooth disease. Cochrane Database of Systematic Reviews 2008, issue DOI: 10.1002/14651858.CD006052.pub2.. - PMC - PubMed

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