The standard
drug for postmenopausal osteoporotic women with a high risk of fracture is alendronic
acid, used in conjunction with non-
drug measures. There are no drugs with demonstrated efficacy on the risk of fracture in castrated men with
prostate cancer.
Denosumab, a
monoclonal antibody that inhibits a
cytokine acting mainly on bone cells and lymphocytes, has been authorised in the European Union for use in both these settings. There are no trials comparing
denosumab versus alendronic
acid for symptomatic fracture prevention. In two trials involving 1189 and 504 women, the incidence of clinical fractures, recorded as simple adverse effects, did not differ significantly between the groups. In a placebo-controlled trial in about 7900 elderly osteoporotic women,
denosumab significantly reduced the incidence of symptomatic vertebral fractures (0.8% versus 2.6% after 3 years) and
hip fractures (0.7% versus 1.2%). An indirect comparison, providing weak evidence, suggests that
denosumab is less effective than alendronic
acid. In a placebo-controlled trial in 1468 castrated men with
prostate cancer,
denosumab did not reduce the incidence of symptomatic fractures after 3 years. Only the incidence of vertebral fractures, detected on routine radiographs, showed a statistically significant decline (1.5% versus 3.5%).
Denosumab has numerous adverse effects. In placebo-controlled trials, this
monoclonal antibody was associated with a higher incidence of deep-seated
infections such as
endocarditis,
cancer, and
skin rash. More data are needed on the risk of
pancreatitis, long-term bone disorders (atypical fractures, delayed fracture healing,
osteonecrosis of the jaw), hypocalcaemia and
cataracts, all of which were reported in clinical trials. In practice,
denosumab is not sufficiently effective to outweigh its established and potential risks in postmenopausal osteoporotic women or in castrated men with
prostate cancer.