Regarding clinical subtypes, no significant difference was observed in serum GDF-15 levels between MSA-C (n = 7, 946.57 ± 330.33 pg/mL) and MSA-P (n = 5, 1023.00 ± 374.23 pg/mL; p = 0.716; Figure 4F). This evidence concerns the gene GDF15 and multiple system atrophy, cerebellar type.