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A missense single-nucleotide polymorphism in the protein tyrosine phosphatase non-receptor 22 (PTPN22) gene, which encodes a negative regulator of T-cell activation, is an important genetic risk factor for rheumatoid arthritis (RA) susceptibility.1 The association of the PTPN22 susceptibility risk allele and the severity of joint destruction is unclear as a result of contradictory observations.2,–,6 To determine an individual patient's rate of joint destruction accurately, it is required that radiological measurements are collected by means of standard procedures, scored quantitatively and sensitively and are repeated in time. Consequently, differences in used measurements and analysis methods may contribute to the occurrence of contrasting findings. Second, although the effect of PTPN22 on RA susceptibility is confined to the anti-citrullinated protein antibody (ACPA)-positive group,2 6 most studies on PTPN22 and joint destruction did not analyse the ACPA-positive subset.2,–,5 The present study studied the effect of the PTPN22 susceptibility risk variant on the rate …
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