Recently, a classical study by Kochi et al. [13] in Japan found that four single nucleotide polymorphisms (SNPs) of FCRL3 (−169C/T, −110A/G, +358C/G, and +1381A/G) were associated with rheumatoid arthritis (RA) and that SNP rs7528684C/T was associated with autoimmune thyroid disease (AITD) and systemic lupus erythematosus (SLE). Here, FCRL3 is linked to rheumatoid arthritis.