IFNG and amyotrophic lateral sclerosis: The DPR positively correlated with the serum IFN-γ level in the ALS<12 m subgroup (r = 0.6525, P = 0.0045, Fig 3E) but not in the ALS≥12 m subgroup (r = 0.2657, P = 0.1229, Fig 3F).