OSTEOPOROSIS PREVENTION AND TREATMENT WITH SEX-HORMONE REPLACEMENT THERAPY

Oestrogen deficiency is by far the major factor contributing to the hi gh rate of osteoporotic fractures in women. The anti-osteoporotic effe ct of estrogen may be explained by its property to regulate cytokine s ecretion and thus balance bone remodeling. In oestrogen deficiency, in creased resorption and remodeling will occur leading to osteoporosis. It has been extensively shown that oestrogen replacement therapy (ERT) prevents postmenopausal bone loss and reduces fracture risk by half, provided that an appropriate dose is used. In order to optimize osteop orosis prevention, ERT should be started as early as possible in menop ause and be maintained as long as possible. ERT may also be effective in elderly osteoporotic patients in preventing bone loss and, reducing fracture risk. The acceptance of ERT, however, at an older age has no t been thoroughly evaluated. A reduction of cardiovascular disease and of climacteric symptoms are among other benefits of ERT. So far, only few postmenopausal women are treated with ERT. ERT without progestins has been repeatedly found associated with an increased risk of develo ping endometrial cancer, but the cyclic addition of progestins protect s from endometrial hyperplasia and carcinoma. Combined oestrogen-proge stin therapy is as efficient as estrogen therapy alone, but not more s o. Since progestins may oppose some of the beneficial effects of estro gens, the lowest dose with the least metabolic impact should be prescr ibed. Women who have had a hysterectomy, should probably be treated by estrogen replacement therapy only. Meta-analyses concerning breast ca ncer associated with ERT found a very moderately increased risk (RR=1. 06). Therefore ERT prescription should be discussed openly with women considering all risks and benefits. In women who have suffered from br east cancer, a bone sparing effect of tamoxifen has been shown.