CHANGES OF CLINICAL AND RADIOGRAPHIC PARAMETERS DURING DENOSUMAB THERAPY IN RHEUMATOID ARTHRITIS PATIENTS RECEIVING GLUCOCORTICOIDS: PRELIMINARY RESULTS

Abstract

When treating rheumatoid arthritis (RA), it is important not only to suppress inflammation, but also to prevent local and generalized bone loss, particularly in patients receiving glucocorticoids (GC). Denosumab is a fully human monoclonal antibody that binds receptor activator of nuclear factor kappa B ligand (RANKL), prevents its interaction with receptor on osteoclasts, reduces their activity, and inhibits bone resorption.Objective: to evaluate the effect of 12-month therapy with denosumab on bone mineral density (BMD) of the axialand peripheral skeleton and destructive changes in the hand and foot joints of RA patients receiving GC.Subjects and methods. Fifty-two postmenopausal women with RA concurrent with osteoporosis received subcutaneous denosumab 60 mg twice: at baseline and 6 months later. BMD was measured before drug administration and after 12 months of a follow-up, by applying dual-energy X-ray absorptiometry of three sections: the lumbar spine (LI–IV), femoral neck (FN), and distal forearm (DF). Radiographic changes in the hand and foot joints were assessed using the Sharp method modified by van der Heijde (SVH) at baseline and 12 months later.Results and discussion. The patients’ mean age was 58.4±6.4 years; the mean RA duration – 19.0±10.9 years. Antiinflammatorytherapy was performed in all the patients, including 30 (57.7%) who received GC. The mean BMD during follow-up increased from 0.814±0.101 to 0.848±0.103 g/cm2 in LI–IV (p<0.001), from 0.629±0.089 to 0.641±0.090 g/cm2 in FN (p=0.02), and from 0.497±0.094 to 0.502±0.091 g/cm2 in DF (р=0.34). The patients receiving and not receiving GC showed a significant increase in LI–IV BMD and a tendency for its rise in FN and DF. There was a significant increase of X-ray changes in the hand and foot joints. Seven of the 52 patients were found to have a larger number of erosions: 33.0 [4.0; 78.0] at baseline and 39.0 [5.0; 90.0] after 12 months (p=0.017); 5 patients had a larger number of narrowed joint spaces: 119.0 [18.0; 140.0] and 124.0 [20.0; 146.0] (р=0.043); the total SVH score increased in 8 patients: 175.5 [54.0; 221.5] and 182.0 [57.0; 235.0] (р=0.011), respectively. Moreover, dividing the patients into groups according to the use of GC revealed significant increase of the number of erosions and total SVH scores only in the patients receiving GC.Conclusion. Therapy with subcutaneous denosumab 60 mg twice a year at a 6-month interval could significantly increase LI–IV BMD regardless of GC intake. Progression of radiographic joint changes was noted mainly in patients receiving GC

Keywords

• rheumatoid arthritis
• osteoporosis
• denosumab
• glucocorticoids
• bone mineral density
• erosions