Similarly, in a study conducted in 87 Caucasian patients (from Spain) diagnosed with RA, a significant association was found between the FCGR3A rs396991-AA genotype and greater EULAR response after 12 months of treatment with TCZ (AA vs. C; p = 0.027; OR = 5.08; 95% CI = 1.20–21.33) [9]. This evidence concerns the gene FCGR3A and rheumatoid arthritis.