Conversely, transforming growth factor‐alpha (OR = 0.8630, p = 0.0298), CD40L receptor (OR = 0.7737, p = 1.1265E‐09) and Interleukin‐12 subunit beta (OR = 0.8987, p = 0.0333) showed inverse associations with ALS, MS and PD, respectively. This evidence concerns the gene CD40 and Parkinson disease.