CTLA4 and juvenile idiopathic arthritis: Associations with an altered risk of the nonresponse to methotrexate in JIA were observed for the alleles/genotypes of the loci IL10 rs1800872 (in girls) and NFKB1 rs28362491 (in girls); with an altered risk of the insufficient response to methotrexate in JIA – for the alleles/genotypes of the loci IL1B rs16944 (in boys), CTLA4 rs3087243 (in boys), NFKB1 rs28362491 (in girls) and the haplotype TNFA rs1800629*A - LTA rs909253*G (in girls).