TNF and rheumatoid arthritis: Similarly, in RA patients, during the follow-up, there was no association between creatinine levels and treatment with steroids (n = 13) (1 month: p = 0.090, 3 months: p = 0.118, 6 months: p = 0.325, 12 months: p = 0.658, last assessment: p = 0.089), methotrexate or TNF inhibitors (n = 17) (1 month: p = 0.324, 3 months: p = 0.333, 6 months: p = 0.433, 12 months: p = 0.568, last assessment: p = 0.599), or other biologics (abatacept n = 4, rituximab n = 2, or IL-6 inhibitors, n = 2) (1 month: p = 0.111, 3 months: p = 0.123, 6 months: p = 0.550, 12 months: p = 0.430, last assessment: p = 0.390).