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Can cystatin C in cerebrospinal fluid be a biomarker for amyotrophic lateral sclerosis? A lesson from previous studies
Author(s) -
Sako Wataru,
Ishimoto Shinji
Publication year - 2014
Publication title -
neurology and clinical neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.125
0ISSN - 2049-4173
DOI - 10.1111/ncn3.82
Subject(s) - amyotrophic lateral sclerosis , cystatin c , medicine , cerebrospinal fluid , biomarker , brainstem , inclusion and exclusion criteria , multiple sclerosis , spinal cord , pathology , oncology , gastroenterology , disease , immunology , creatinine , psychiatry , biochemistry , chemistry , alternative medicine
Background and Aim Amyotrophic lateral sclerosis ( ALS ) is an idiopathic and fatal neurodegenerative disease of the motor system that results in loss of upper and lower motor neurons in the brainstem and multiple spinal cord regions. We do not have a useful biomarker for early diagnosis yet. In terms of cerebrospinal fluid ( CSF ), cystatin C is a candidate, but the results are controversial. In the present study, we synthesized the results of published research on cystatin C in CSF to test whether or not cystatin C level was reduced in ALS relative to other neurological disorders ( OND ) using a meta‐analysis method. Methods Comprehensive literature search yielded four studies that satisfied our inclusion criteria (112 ALS , 72 OND ). The outcome of cystatin C concentration was expressed as the standardized mean difference ( SMD ) between ALS and OND . Results The overall effect of ALS on cystatin C level in CSF was not significantly different from OND ( SMD = −0.81, 95% CI −1.78 to 0.16, P = 0.10, four studies, n = 184). This result was based on heterogeneous studies ( P < 0.0001, I 2 = 88%). We carried out sensitivity analysis with the exclusion of each study sequentially. There was no significant summary effect regardless of any exclusion. Conclusions The present meta‐analysis could not detect a significant difference of cystatin C in CSF between ALS and OND with heterogeneous studies. Here, we mainly discussed the possible cause of heterogeneity, which provided several suggestions for future research.