PDCD1 and rheumatoid arthritis: This study quantified PD-1 and TIGIT expression in CD4 and CD8 T cells in patients with IMID and examined associations with disease characteristics and anti-tumour necrosis factor (TNF) response.<h4>Methods</h4>Biologics-naïve patients with RA and spondyloarthritis (AS) were followed prospectively to assess anti-TNF response at 12 months.