Effectiveness of Bazedoxifene for Prevention of Glucocorticoid-induced Bone Loss in RA Patients

• The purpose of this study is to study the effectiveness of bazedoxifene in preventing loss of bone mineral density (BMD) and trabecular bone score (TBS), and any fractures in postmenopausal rheumatoid arthritis (RA) patients receiving long-term GCs.
• This was a randomized, controlled, open-label study conducted for 56 weeks. Four trial visits occurred over the course of the 56 weeks. At study entry, all patients who took elemental calcium (1200 mg daily) and vitamin D (800 IU daily) were assigned by blocks of two to receive either bazedoxifene (20 mg/day) (bazedoxifene group) or not (control group).
• Randomization was performed by an independent coordinator. Participants were followed-up at 24 weeks and 48 weeks with special attention to RA flares and occurrence of AEs.
• Demographic characteristics such as age, sex, and medications related to RA, as well as laboratory result such as complete blood count (CBC), chemistry, and levels of inflammatory markers were collected at enrollment. BMD and trabecular bone score (TBS) were assessed at 0 and 48 weeks, and levels of bone turnover markers were assessed at 0, 24, and 48 weeks. At 56 weeks, the occurrence of AEs was assessed.

Inclusion criteria

• Female RA patients ≥ 45 years old with self-reported postmenopausal for ≥12 months or prior hysterectomy with bilateral oophorectomy. Female patients ≥ 55 years old who had prior hysterectomy without oophorectomy or with unilateral oophorectomy.
• Having been receiving low to moderate dose of glucocorticoids (prednisone ≤7.5 mg/day or equivalent) for ≥3 months prior to entry. (When taking glucocorticoids PRN, prednisone ≥1mg/day in average.)
• Patients expected to be on glucocorticoid treatment for 3 months after entry.
• Patients with an osteopenic mean lumbar spine (LS; L1-L4) or femoral neck bone mineral density (BMD; -1 < T-score < -2.5)
• Patients who provide a written consent of participating in this study.

Exclusion criteria

• Patients with condition that may interfere with the evaluation of spinal or hip osteoporosis by DXA such as two or more vertebral (L1-L4) fractures or other vertebral deformity
• Patients with hypercoagulability risk factors or a history of deep vein thrombosis and pulmonary embolism
• History of allergic reactions or intolerance to bazedoxifene or other SERM
• Patients receiving bisphosphonates, parathyroid hormone, SERMs, or anticonvulsants therapies within 6 months prior to entry
• Patients with known bone disorders such as osteomalacia, renal osteodystrophy and hyperparathyroidism
• Patients with undiagnosed uterine bleeding
• Patients with severe renal impairment or creatinine clearance <30ml/min