The GWAS analysis of TMM‐NEO considering the confounding factors indicated that five genomic regions, located at 1p32.2 (rs377546683, P = 3.85122E‐08) in the DAB1 region, 3q25.1 (rs138021793, P = 1.59838E‐08) and 4q26 (rs115442324, P = 2.9459E‐08) near UGT8, 5q35.1 (rs117928019, P = 2.05066E‐08) in the DOCK2 region, and 22q13.1 (rs185293917, P = 9.57557E‐09) near PDGFB, were loci associated with PPD above the whole genome‐wide significance threshold of 5 × 10–8. This evidence concerns the gene UGT8 and progressive pseudorheumatoid arthropathy of childhood.