Warning against calcitonin salmon for osteoporosis

Calcitonin salmon is a man-made version of the hormone found in salmon. Citing potential cancer risks, Food and Drug Administration advisors have recommended against the use of calcitonin salmon for the treatment of postmenopausal osteoporosis. Maria Perno Goldie, RDH, MS, examines the recommended use of calcitonin products.

May 3rd, 2013
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Food and Drug Administration (FDA) advisors recommend against use of calcitonin salmon for the treatment of postmenopausal osteoporosis because the potential cancer risks outweigh the benefits.(1) Calcitonin salmon is a man-made version of the hormone found in salmon. The vote was 12-9. Briefing materials compiled by the FDA say that the potential for cancer risk "appears plausible" and that "significant questions" remain about whether therapy is effective in reducing fractures.(1)

Currently available as a nasal spray (Miacalcin, Fortical) or injectable solution (Miacalcin), calcitonin products accounted for about 5% of sales of osteoporosis medications in 2011.(2,3,4) A meeting was convened to review and discuss the available data regarding the safety and efficacy of calcitonin salmon products for the treatment of osteoporosis.

In light of the potential risk of cancer associated with calcitonin salmon use, FDA believes that it is important to revisit the risk/benefit assessment for calcitonin salmon products for the treatment of osteoporosis. The FDA will make a final determination after considering the advisory committee's recommendations.

The panel also voted (20-1) that companies developing new calcitonin salmon products must prove they are effective in reducing fracture risk. This action was prompted by a FDA review that found significant questions persist regarding whether calcitonin salmon is effective in reducing fractures.

Other calcitonin products include Unigene Laboratories Inc.'s nasal spray. Privately held Upsher Smith Laboratories Inc. distributes Unigene's product in the United States. Generic calcitonin products are also available.

The current recommendation is that the drugs should only be authorized for short-term use in Paget's disease, a bone disorder; for acute bone loss due to sudden immobilization; and for excess calcium in the blood caused by cancer.(4)

Osteoporosis is a systemic skeletal disease characterized by low bone mass and structural deterioration of bone tissue leading to bone fragility and increased risk of fracture. Based on NHANES III data, it is estimated that approximately 10 million people in the U.S. have osteoporosis and another 34 million have low bone mass (osteopenia).(5) The goal of therapy is to reduce the risk of fracture.

For postmenopausal osteoporosis, there are currently two approved indications:

1. Treatment of osteoporosis in postmenopausal women (or women at high risk of fracture, as with Forteo and Prolia);
2. Prevention of osteoporosis in postmenopausal women.

Osteoporosis is mainly diagnosed using bone mineral density (BMD) techniques based on the diagnostic criteria set forth by the World Health Organization (WHO) in 1994.(6) However, experts agree that BMD alone is not sufficient to accurately predict fracture risk. This led to the development of a new risk assessment tool for prediction of osteoporotic fracture (FRAX).(7)

The FRAX algorithms, developed by the WHO in 2008, include clinical risk factors that predict an increased risk of fracture (age, sex, prior fragility fracture after age 50 years, history of corticosteroid use [the equivalent of ≥ 5 mg of prednisone for more than three months], parental history of hip fracture, rheumatoid arthritis, secondary osteoporosis, current tobacco use, alcohol use of greater than 2 units daily, and low body mass index). Using the FRAX tool, fracture risk is reported as the 10 year risk of hip fracture and the 10-year risk of major osteoporotic fracture.

Currently, the National Osteoporosis Foundation recommends treatment be considered for patients who have had an osteoporotic fracture, patients with a BMD T-score of <-2.5 (2.5 standard deviations (SD) below the young adult mean), and patients over age 50 years with low bone mass (T-score -1.0 to -2.5) with 10-year risk probability of >3% for hip fracture or >20% for major osteoporotic fracture as obtained using the FRAX algorithm.(8)

To view a PDF of the WHO Fracture Risk Assessment Tool(9), click here.

The FDA will make a final determination after considering the advisory committee's recommendations.

Approved Products for the Treatment of Post-Menopausal Osteoporosis(2)

(Reporting by Toni Clarke in Washington; Editing by Leslie Adler)
http://news.yahoo.com/fda-panel-advises-calcitonin-salmon-not-used-osteoporosis-221820123--finance.html

References
1. Reuters report Tue, Mar 5, 2013. http://www.reuters.com/article/2013/03/05/us-fda-calcitonin-idUSBRE92418H20130305.
2. Novartis. http://www.pharma.us.novartis.com/cs/www.pharma.us.novartis.com/product/pi/pdf/miacalcin_nasal.pdf.
3. Upsher-Smith Laboratories, Inc. http://www.fortical.com/.
4. Food and Drug Administration. Background Document for Meeting of Advisory Committee for Reproductive Health Drugs and Drug Safety and Risk Management Advisory Committee. http://www.fda.gov/downloads/AdvisoryCommittees/CommitteesMeetingMaterials/Drugs/ReproductiveHealthDrugsAdvisoryCommittee/UCM341779.pdf.
5. Kanis JA, McCloskey EV, Johansson H, Oden A, Melton LJ, Khaltaev N. A reference standard for the description of osteoporosis. Bone (2008); 42:467-475.
6. Miller PD, Zapalowski C, Kulak CAM and Bilezikian JP. Bone Densitometry: The Best Way to Detect Osteoporosis and to Monitor Therapy. The Journal of Clinical Endocrinology & Metabolism June 1, 1999 vol. 84 no. 6 1867-1871.
7. http://www.shef.ac.uk/FRAX/.
8. http://www.nof.org/.
9. http://www.shef.ac.uk/FRAX/charts/Chart_USc_ost_wom_bmd.pdf.

Maria Perno Goldie, RDH, MS

To read previous RDH eVillage FOCUS articles by Maria Perno Goldie, click here.

To read more about osteoporosis and dental hygiene, click here.

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