The small exploratory sub-study data showed that, at month 12, the investigational bone-forming agent romosozumab increased estimated bone strength (percent change from baseline) at the spine and hip more than open-label teriparatide in postmenopausal women with low bone mass. These results were measured by a validated method called finite element analysis (FEA), which utilized quantitative computed tomography (QCT) scans to simulate compression overload to estimate vertebral strength, and a sideways fall to estimate femoral strength.2
"Engineers and physicists have long used finite element analysis to better understand the structural integrity and failure of physical objects when subjected to load," said lead investigator
The FEA showed that, at the spine, women in the romosozumab group (210 mg once monthly, n=24) increased estimated strength compared to baseline by 27.3 percent at month 12, which was greater than placebo (–3.9 percent, n=27) and teriparatide (18.5 percent, n=28).2 At the hip, the estimated strength increased from baseline by 3.6 percent with romosozumab (n=9), compared with placebo (-0.1 percent, n=18) or teriparatide (-0.7 percent, n=19).2
These data are from a small exploratory sub-study (n=79) of a Phase 2 trial (NCT00896532) that included a total of 419 patients. A subset of these women underwent spine and hip QCT imaging to measure bone mineral density (BMD) gains.3 To investigate the effects of romosozumab on bone strength an FEA was performed on these QCT scans.
"The strength improvements observed with romosozumab in this trial – and documented using a validated method for assessing fracture risk and monitoring treatment – further support its potential as a treatment option for patients at high risk for fracture," said
Adverse events in the original Phase 2 study were similar across groups, except for mild, generally non-recurring injection site reactions observed more frequently with romosozumab compared to placebo, but with no observed dose-related relationship. The most common adverse events included mild upper respiratory tract infection, pain in the back and joints, and headache. These reactions did not lead to study drug discontinuation or study withdrawal; the safety of romosozumab will be further addressed in subsequent larger studies.
"These data illustrate the potential impact of building bone through both increasing bone formation and decreasing bone resorption as romosozumab has demonstrated in skeletal regions of interest. These sub-study results reinforce our confidence in the ability of romosozumab to build bone strength as well as density and we look forward to reporting the outcomes of the first fracture study in 2016," said Professor Dr.
About Finite Element Analysis
Finite element analysis (FEA) is a computer model of a material or design that is stressed and analyzed and tested for specific results. This involves breaking down an object into a large number of finite elements (e.g., small cubes), and using mathematical equations to help predict the behavior of each element. These behaviors are then calculated by a computer to predict the behavior of the object as a whole.
FEA has been applied for the past 40 years to simulate the mechanical behavior of bone, helping to predict strength at major fracture sites, like the lumbar spine and femoral hip.
Romosozumab is an investigational bone-forming monoclonal antibody and is not approved by any regulatory authority for the treatment of osteoporosis. It is designed to work by inhibiting the protein sclerostin, thereby increasing bone formation and decreasing bone breakdown. Romosozumab is being studied for its potential to reduce the risk of fractures in an extensive global Phase 3 program. This program evaluating the safety and efficacy of romosozumab includes two large fracture trials comparing romosozumab to either placebo or active comparator in more than 10,000 postmenopausal patients with osteoporosis. Primary results from the Phase 3 study FRAME are expected in the first half of 2016. Romosozumab is being co-developed by
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1 McClung MR, Grauer A, Boonen S, et al. Romosozumab in postmenopausal women with low bone mineral density. N Engl J Med. 2014 Jan 30;370(5):412-20.
2 Keaveny TM et al. Romosozumab improves strength at the lumbar spine and hip in postmenopausal women with low bone mass compared with teriparatide. Abstract 1143, Oral Presentation, ASBMR,
3 Genant KH et al. Effect of Romosozumab on Lumbar Spine and Hip Volumetric Bone Mineral Density (vBMD) as Assessed by Quantitative Computed Tomography (QCT). Presentation Number: 1022, ASBMR
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