TRIM21 and systemic lupus erythematosus: Moreover, subgroups dominated by anti-Ro52 (i.e., subgroups 1 and 6) showed an association with the HLA-DRB1∗03 allele in our study, similar to associations found in specific subgroups dominated by anit-Ro60/52 in Sjögren syndrome26 and systemic lupus erythematosus.27