Parathyroid hormone builds bone in osteoporosis.
The user of micro-CT supports previous research by Dr. Dempster, professor of clinical pathology at Columbia University, New York, and director of the regional bone center at Helen Hayes Hospital, West Haverstraw, N.Y., and his colleagues on the use of parathyroid hormone (PTH) as a bone builder.
The Treatment of Osteoporosis with Parathyroid Hormone (TOP) study, sponsored by Salt Lake City-based NPS Pharmaceuticals, included about 2,600 women who were treated daily with either 100 mcg injections of PTH or a placebo for 18 months. In addition, all of the patients received 700 mg of calcium and 400 IU of vitamin D daily. The researchers obtained iliac crest biopsies from women in both the PTH and placebo groups, he said.
Based on the micro CT data, the mean cancellous bone volume was significantly higher (45%) among women treated with PTH, compared with the placebo group. In addition, this increase was associated with 12% and 17% increases in the mean trabecular number and thickness, respectively, in the PTH group, compared with the placebo group.
Dr. Dempster and his colleagues previously reported similar results when they used histomorphometry to assess iliac crest biopsies in the TOP study patients: Compared with the placebo-treated women, the PTH-treated women had increases of 48%, 24%, and 17% in cancellous bone volume, trabecular number, and trabecular thickness, respectively.
Although both techniques similarly revealed improvements in bone volume and thickness in the PTH group, they each offer some unique information and thus complement each other. Micro-CT is rapid and nondestructive, and provides quantitative information on the 3-D architecture of bone, whereas histomorphometry provides details about the impact of PTH on bone turnover and bone cell populations.
Dr. Dempster is a consultant for NPS Pharmaceuticals.
BY HEIDI SPLETE
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|Publication:||Internal Medicine News|
|Date:||Jul 15, 2005|
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