Risedronate, an effective treatment for glucocorticoid-induced bone loss in CKD patients with or without concomitant active vitamin D (PRIUS-CKD).

Author(s): Fujii N, Hamano T, Mikami S, Nagasawa Y, Isaka Y, Moriyama T, Horio M, Imai E, Hori M, Ito T

Affiliation(s): FASN Department of Internal Medicine, Osaka University School of Medicine, Box A8, 2-2 Yamada-oka, Suita 565-0871, Japan.

Publication date & source: 2007-06, Nephrol Dial Transplant., 22(6):1601-7. Epub 2006 Nov 23.

Publication type: Randomized Controlled Trial; Research Support, Non-U.S. Gov't

BACKGROUND: Recent post hoc analysis proved the efficacy and tolerability of risedronate in osteoporotic patients with renal impairment, but the combination of active vitamin D in chronic kidney disease (CKD) patients taking glucocorticoids remains unknown. METHODS: We conducted a prospective study enrolling 114 CKD patients (creatinine clearance > or =30 ml/min/1.73 m(2)) receiving glucocorticoid therapy for > or =6 months. Eighty-eight subjects who had received active vitamin D (aVD) were randomly assigned to either a group treated with aVD only (group A), or to a group also receiving risedronate 2.5 mg/day (group B). The remaining patients (group C) received risedronate only. RESULTS: After 1 year 100 subjects were analysed. Risedronate was effective on the lumbar spine, but not on the femoral neck. The lumbar bone mineral density (BMD) significantly increased by 2.8 and 2.5% in groups B and C, respectively, but decreased by 1.0% in group A. Serum N-terminal telopeptides of type I collagen (S-NTX) and bone alkaline phosphatase (ALP) fell significantly in groups B and C at 3 and 6 months, respectively, while in group A S-NTX remained unchanged and bone ALP significantly increased. There was no significant difference between groups B and C regarding BMD and bone markers. The reduction rate of S-NTX (bone ALP) at 6 months predicted the increase in lumbar BMD at 1 year with a sensitivity of 73% (34%) and a specificity of 46.2% (100%). CONCLUSIONS: Risedronate is effective in increasing BMD with or without aVD in CKD patients receiving long-term glucocorticoid therapy. Bone markers are of some use in predicting the response to anti-resorptive therapy.