TNF and rheumatoid arthritis: The results of our study disclosed a significant difference in ACCP, TNF-α, tender joint count of 28 joints (TJ-28), swollen joint count of 28 joints (SJ-28), and health assessment questionnaire-disability index (HAQ-DI) in disease activity groups. A significant correlation of serum TNF-α with DAS28-ESR in RA patients was observed.