Comparison of muscle histopathological findings in different genetic motor neuron disorders.

All P values in the right-most column apply to comparisons of both C9ALS versus SBMA and C9ALS versus SMAJ. None of the differences between SMAJ and SBMA groups were statistically significant. SMAJ = spinal muscular atrophy, Jokela type, SBMA = spinal and bulbar muscular atrophy, C9ALS = amyotrophic lateral sclerosis caused by pathological hexanucleotide expansion in the gene C9orf72. NA = not available.