PIAS4 and chronic inflammatory demyelinating polyradiculoneuropathy: RME (P values) for PIAS2, PIAS3 and PIAS4 genes in CIDP cases versus controls were 2.22E-03 (4.5E-13), 9.02E-03 (1.7E-08) and 1.05E-02 (3.8E-09), respectively.