PPARG and glioma: The results showed PPARG rs2920503 was strongly related to higher risk of high-grade glioma (III + IV) in co-dominant (OR = 2.04, 95%CI = 1.13–3.68, P = 0.018) and recessive (OR = 2.03, 95%CI = 1.15–3.57, P = 0.014) models.