[HTML][HTML] Parathyroid hormone for the prevention of bone loss induced by estrogen deficiency

JS Finkelstein, A Klibanski, EH Schaefer… - … England Journal of …, 1994 - Mass Medical Soc
JS Finkelstein, A Klibanski, EH Schaefer, MD Hornstein, I Schiff, RM Neer
New England Journal of Medicine, 1994Mass Medical Soc
Background Analogues of gonadotropin-releasing hormone (GnRH) are often given to
induce hypogonadism in women who have estrogen-dependent disorders such as
endometriosis and uterine leiomyomas. Because estrogen deficiency causes bone loss,
concern about premature osteoporosis has prevented long-term therapy with GnRH
analogues. We conducted a study to determine whether parathyroid hormone could prevent
bone loss in women receiving therapy with GnRH analogues. Methods We administered …
Background
Analogues of gonadotropin-releasing hormone (GnRH) are often given to induce hypogonadism in women who have estrogen-dependent disorders such as endometriosis and uterine leiomyomas. Because estrogen deficiency causes bone loss, concern about premature osteoporosis has prevented long-term therapy with GnRH analogues. We conducted a study to determine whether parathyroid hormone could prevent bone loss in women receiving therapy with GnRH analogues.
Methods
We administered human parathyroid hormone (40 μg subcutaneously daily) to 20 of 40 women with endometriosis who were being treated with nafarelin (200 μg intranasally twice daily) for six months; the remaining 20 women received only nafarelin. Cortical and trabecular bone density and biochemical markers of bone turnover were measured every three months during the six-month study period.
Results
Serum estradiol concentrations fell to postmenopausal values in 36 of the 40 women. In the women who received nafarelin alone, the mean (±SE) bone density in the lumbar spine decreased by 2.8 ±0.5 percent (P<0.001) when measured in the anteroposterior projection and by 3.5 ±0.8 percent (P<0.001) when measured in the lateral projection. In contrast, bone density in the lumbar spine did not change when measured in the anteroposterior projection and increased by 3.4 ±1.2 percent when measured in the lateral projection (P = 0.01) in the women who also received parathyroid hormone. Bone density at the femoral neck decreased slightly and similarly in both groups. Radial bone density did not change in either group. Serum alkaline phosphatase and osteocalcin concentrations and urinary hydroxyproline and pyridinoline excretion increased (P<0.001) in the women who received nafarelin plus parathyroid hormone.
Conclusions
Parathyroid hormone can prevent bone loss in the lumbar spine in young women with estrogen deficiency caused by treatment with GnRH analogues.
The New England Journal Of Medicine