After exploring, a researcher found that Tan IIA could effectively inhibit the increased mRNA expression of multiple matrix metalloproteinases (including MMP2, MMP3, MMP8, and MMP9) and proinflammatory factors in RA-FLSs stimulated by induced by TNF-α, resulting in the inhibition of inflammatory reactivity and end of knee joint destruction, which indicates the promising therapeutic role in the treatment of RA and shows potential to improve the life quality of RA patients (Du et al., 2020). Here, MMP9 is linked to rheumatoid arthritis.