PRTN3 and rheumatoid arthritis: According to the predetermined inclusion criteria, 37 patients were excluded and 202 patients were evaluated for the diagnostic criteria of RA and differentiated according to seropositivity for Rheumatic factor (RF) and anti-citrullinated protein antibodies (ACPA) as follows: High RA-seropositive patients (n = 57; 28.2%) and fulfilling the whole diagnostic spectrum of RA (RA-group).