In RA, FAPI labeled with gallium 68 (68Ga-FAPI) or aluminum-(18-F)-labeled 1,4,7-triazacyclononane-N, N’,N′′-triacetic acid (18F-AIF-NOTA-FAPI) can be used to clearly reveal inflammatory joints and assess disease activity [55, 56], indicating that FAPα is an excellent candidate for RA therapy. This evidence concerns the gene FAP and rheumatoid arthritis.