This multicentre, retrospective study by Hayashi, et al. found no significant differences in efficacy and safety between tofacitinib, baricitinib, peficitinib and upadacitinib in patients with RA. Predictive factors for resistance to LDA achievement included baseline CRP and CDAI for tofacitinib and baseline glucocorticoid dose, baseline CDAI and number of previous b/tsDMARDs for baricitinib.