The RA group had higher TNF‐α compared to the NC and HTN groups (ANOVA, P = 0.027; post hoc RA vs. NC and RA vs. HTN, P < 0.05) and numerically (but not statistically significantly) higher TNF‐α than the RA‐HTN group (post hoc RA vs. RA‐HTN, P = 0.062). The gene discussed is TNF; the disease is rheumatoid arthritis.