Doctor's Guide, June 27, 2007
OXFORD, U.K. - Patients treated with intravenous bisphosphonates are at an increased risk of jaw or facial bone deterioration or infection, according to a study published online June 26 in the Journal of the National Cancer Institute. Several recent studies have found an association between the use of intravenous bisphosphonates and osteonecrosis of the jaw or facial bones, a condition in which poor blood supply to the area leads to bone death or deterioration.
Bisphosphonates are used to treat cancer-related bone lesions, elevated levels of calcium in the blood, or reduced bone density. Gregg Wilkinson, PhD, of the University of Texas Medical Branch in Galveston and colleagues used data from the Surveillance, Epidemiology, and End Results registry to identify more than 14,000 cancer patients who were treated with either pamidronate or zoledronic acid -- two types of bisphosphonates -- and more than 28,000 patients who did not received bisphosphonates. After six years, about 5.5% of bisphosphonate users had undergone facial or jaw bone surgery or were diagnosed with inflammation of the jaw bone, compared with 0.3% of non-users. From the database, they could not determine for certain whether the bisphosphonates caused the bone problem or if the patients were already predisposed to bone problems. They also found that the use of these drugs increased from 170 patients in 1990 to 5,348 patients in 2003. http://www.docguide.com/news/content.nsf/news/852571020057CCF685257307006E6B95