US guidelines recommend pharmacologic therapy for postmenopausal women with a bone density T-score (standard deviation from normal mean values in healthy young women) of -2.5 or below in the lumbar spine, femoral neck, total hip, or distal radius, a T-score between -1.0 and -2.5 and a history of fragility (low-trauma) fracture of the hip or spine, or a T-score between -1.0 and -2.5 and a FRAX 10-year probability of ≥3% for hip fracture or ≥20% for major osteoporotic fracture (hip, clinical spine, humerus, distal radius).

Diagnosis of osteoporosis is based on the results of bone mineral density (BMD) testing or by the occurrence of a fragility fracture. Bone densitometry results are generally reported in terms of standard deviations (SD) from the mean value for young adults (T-score). The World Health Organization (WHO) defines osteoporosis in women as a T-score of -2.5 or below in the spine, femoral neck, or total hip. A computerized model (FRAX) is available that estimates the 10-year probability of a hip fracture or other major osteoporotic fracture based on clinical risk factors and BMD at the femoral neck.

View the Comparison Table: Drugs for Postmenopausal Osteoporosis

US guidelines for the treatment of osteoporosis have been published. The diagnosis of osteoporosis has traditionally been established by the occurrence of fragility fractures or by bone densitometry, which is generally reported in terms of standard deviations (SD) from mean values in young adults (T-score). The World Health Organization (WHO) has defined normal bone mineral density (BMD) for women as a value within one SD of the young adult mean. Values 2.5 SD or more below the mean (T-score -2.5 or below) at the spine, femoral neck, or total hip are defined as osteoporosis. The WHO has developed a computerized model (FRAX) that predicts the 10-year probability of a hip fracture or other major osteoporotic fracture based on clinical risk factors and BMD at the femoral neck.

Two FDA advisory committees recently concluded that use of a nasal spray formulation of the peptide hormone salmon calcitonin for treatment of postmenopausal osteoporosis is associated with an increased risk of cancer. Salmon calcitonin is available as 2 nasal sprays (Miacalcin, Fortical) and an injectable formulation (Miacalcin Injection) for use in osteoporosis.1

The new cancer concern arose from the results of an unpublished meta-analysis that included 18 studies of Miacalcin Nasal Spray in which the risk of any cancer was 1.54 times greater (95% CI: 1.06, 2.23) in patients who used the drug compared to controls.2

An earlier 5-year trial in >1200 postmenopausal women with osteoporosis also found that use of calcitonin was associated with a small, but statistically significant, increase in the risk of any malignancy (OR 1.62, 95% CI: 1.00, 2.61).2 New vertebral fractures occurred in 51 of 287 women (18%) receiving a 200 IU dose of calcitonin nasal spray once daily and in 70 of 270 women (26%) receiving placebo, a statistically significant difference.3

The advisory committees, meeting jointly, weighed the risk against the benefits of the drug and concluded that women should no longer use salmon calcitonin nasal spray for treatment of postmenopausal osteoporosis. The FDA now has to decide whether to approve their recommendations.

1. Drugs for postmenopausal osteoporosis. Treat Guidel Med Lett 2011; 9:67.

2. Novartis. FDA Joint Reproductive Health Drugs and Drug Safety and Risk Management Advisory Committee meeting on the benefit/risk of salmon calcitonin for the treatment of postmenopausal osteoporosis. Briefing book. Available at www.fda.gov/downloads/AdvisoryCommittees/CommitteesMeetingMaterials/Drugs/ReproductiveHealthDrugsAdvisoryCommittee/UCM341781.pdf. Accessed April 4, 2013.

3. CH Chesnut 3rd et al. A randomized trial of nasal spray salmon calcitonin in postmenopausal women with established osteoporosis: the prevent recurrence of osteoporotic fractures study. PROOF Study Group. Am J Med 2000; 109:267.

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Osteoporosis is characterized by low bone mass with microarchitectural disruption and skeletal fragility that results in an increased risk of fracture. The diagnosis has traditionally been established by bone densitometry, which is generally reported in terms of standard deviations (SD) from mean values in young adults (T score). The World Health Organization (WHO) has defined normal bone mineral density (BMD) for women as a value within one SD of the young adult mean. Values 2.5 SD (T score -2.5) or more below the mean are defined as osteoporosis. The WHO has developed a computerized model (FRAX) that predicts the 10-year probability of hip fracture based on clinical risk factors and BMD at the femoral neck.