IL2 and Intervertebral disk degeneration: Hanaei investigated the polymorphism of IL-2 +166G/T, IL-2 -330G/T, IL-12−1188A/C, IFN-γ+847A/T, IL-4 (rs2243248 (1098G/T), rs2243250 (590 C/T), rs2070874 (33 C/T)), and 1 SNP IL-4RA (rs180275, þ1902 A/G) in patients with intervertebral disc degeneration using PCR.