TNF and proximal spinal muscular atrophy: In contrast, there were significant associations between the GA heterozygotes for TNF rs1800629 (GG/GA, OR = 0.419, 95% CI = 0.190–0.923, p = 0.031) and carriers of at least one A allele (GG/GA + AA, OR = 0.476, 95% CI = 0.228–0.993, p = 0.048) and lower SMA risk according to the additive and dominant genetic models, respectively.