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2015 ; 10
(6
): 1031-40
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A Randomized Trial of Cinacalcet versus Vitamin D Analogs as Monotherapy in
Secondary Hyperparathyroidism (PARADIGM)
#MMPMID25904755
Wetmore JB
; Gurevich K
; Sprague S
; Da Roza G
; Buerkert J
; Reiner M
; Goodman W
; Cooper K
Clin J Am Soc Nephrol
2015[Jun]; 10
(6
): 1031-40
PMID25904755
show ga
BACKGROUND AND OBJECTIVES: Direct comparison of cinacalcet and vitamin D analogs
as monotherapies to lower parathyroid hormone (PTH) levels has not been
undertaken. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: This was a
prospective, multicenter, phase 4, randomized, open-label study that enrolled
participants from 2010 to 2012. Adult participants (n=312) on hemodialysis with
PTH >450 pg/ml were randomized 1:1 to 12 months of treatment with either
cinacalcet (n=155) or vitamin D analogs (n=157) to evaluate the mean percentage
change in plasma PTH level (primary end point) and the proportion of participants
achieving plasma PTH <300 pg/ml or a ?30% decrease in PTH (secondary end points).
A preplanned analysis to determine whether there were important
region-by-treatment interactions was also undertaken. RESULTS: Baseline mean PTH
was 846 pg/ml (n=155) for cinacalcet and 816 pg/ml (n=157) for vitamin D analog
therapy. The mean (95% confidence interval) percentage change from baseline in
PTH was -12.1% (-20.0% to -4.1%) in the cinacalcet arm and -7.0% (-14.9% to 0.8%)
in the vitamin D analog arm, a difference of -5.0% (-15.4% to 5.4%) (P=0.35).
Similarly, there was no difference in achievement of secondary efficacy end
points between arms (19.4% and 15.3% of participants with PTH?300 pg/ml and 42.6%
and 33.8% of participants had a PTH reduction >30% in the cinacalcet and vitamin
D analog arms, respectively). A prespecified analysis revealed a large
treatment-by-region interaction, with nominally greater response to cinacalcet
compared with vitamin D analogs in non-United States participants (US versus
non-US participants, P<0.001). Hypocalcemia was more common in the cinacalcet
arm, whereas hypercalcemia and hyperphosphatemia occurred more often in the
vitamin D analog arm. CONCLUSIONS: Participants had similar modest reductions in
PTH with either cinacalcet or vitamin D analog monotherapy over 52 weeks of
treatment, but effects varied by region. Treatments differed with regard to
effect on calcium and phosphorus levels.
|*Renal Dialysis/adverse effects
[MESH]
|Aged
[MESH]
|Aged, 80 and over
[MESH]
|Australia
[MESH]
|Biomarkers/blood
[MESH]
|Calcimimetic Agents/adverse effects/*therapeutic use
[MESH]
|Canada
[MESH]
|Cinacalcet/adverse effects/*therapeutic use
[MESH]