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Bisphosphonates and Glucocorticoid-Induced Thorax 1998;53:331–332 331 Bisphosphonates and glucocorticoid-induced osteoporosis: implications for patients with respiratory diseases Thorax: first published as 10.1136/thx.53.5.331 on 1 May 1998. Downloaded from Simone Cowan, Suzanne Morin, Pierre Ernst Osteoporosis is a well known consequence of glucocorti- glucocorticoid dose.215Moreover, epidemiological studies coid treatment that can result in significant morbidity and enrolling patients with respiratory diseases to assess the use mortality.1–4 Glucocorticoid-induced bone loss occurs of etidronate in glucocorticoid-induced osteoporosis have early, usually within 6–12 months of starting therapy. Dur- used non-randomised16–18 or unblinded16 18 19 designs, short ing this time the rate of bone loss is rapid before decreas- follow up periods,19 and historical controls.18 By demon- ing or reaching a plateau.124 Clinically this decrease in strating the usefulness of etidronate for treating bone mineral density puts patients at an increased risk of glucocorticoid-induced osteoporosis, Pitt et al have con- fracture.1245 Specifically, with a decline in bone mass of firmed the results of this preliminary research. one standard deviation below the mean for young adults, Unfortunately, the study by Pitt et al lacked suYcient the risk of fracture doubles.5 Characteristically, power to translate the primary eYcacy measure of bone glucocorticoid-induced osteopenia and osteoporosis occur mineral density into a clinical measure of eVectiveness such at a faster rate in trabecular bone; consequently, the ribs as a decrease in the rate of fracture.14 These investigators and vertebrae are common sites of fracture, although hip were also unable to find significant treatment diVerences in fractures have also been reported.67 As long term bone mineral density of the trochanter or femoral neck, as treatment with oral glucocorticoids is a common practice in a previous study of glucocorticoid-induced in the management of patients with chronic respiratory osteoporosis.17 diseases, strategies to decrease the burden of It is noteworthy that 60.9% and 47.5% of the screened glucocorticoid-induced osteoporosis are needed. population in the study by Pitt et al met the WHO defini- Glucocorticoid-induced bone loss results from a de- tion for osteoporosis of the hip and spine, respectively.14 crease in bone formation due to reduced intestinal calcium This finding underlines the necessity for preventive thera- absorption, increased urinary calcium excretion, and pies. The bisphosphonates have also shown favourable reduced osteoblast formation and function.1248 The results in the prevention of glucocorticoid-induced osteo- bisphosphonates, a class of drugs structurally similar to porosis. Diamond et al reported that cyclical etidronate pyrophosphate, alter the bone remodelling process. By prevented glucocorticoid-induced bone loss of the lumbar binding to hydroxyapatite these agents structurally inhibit spine and femoral neck in postmenopausal women osteoclastic activity and prevent bone resorption.9 This commencing glucocorticoids for the first time or recom- significantly increases bone mineral density in the lumbar mencing therapy.18 In a recent double blind, placebo con- http://thorax.bmj.com/ spine and femur and decreases the rate of fracture at these trolled trial by Adachi et al,20 a significant diVerence in the sites.10–13 For this reason, bisphosphonates such as etidro- mean percentage change from baseline in the bone mineral nate and alendronate have received oYcial approval for the density of the lumbar spine (3.72%) and trochanter treatment and prevention of postmenopausal osteoporosis (4.14%) was detected between patients randomised to in many countries. The bisphosphonates have also been receive cyclical etidronate or placebo. Patients recently studied in the prevention and treatment of glucocorticoid- starting treatment with glucocorticoids maintained their induced osteoporosis. bone mineral density of the lumbar spine and trochanter In this issue of Thorax Pitt et al shed further light on the when randomised to receive preventive therapy with on September 30, 2021 by guest. Protected copyright. use of etidronate for the treatment of glucocorticoid- etidronate; in contrast, those in the placebo group experi- induced osteoporosis.14 Using a double blind, placebo con- enced a 3.23% and 2.74% decrease from baseline, respec- trolled design, patients receiving oral glucocorticoids for at tively. Furthermore, significantly fewer postmenopausal least six months were randomised to receive etidronate women receiving etidronate sustained vertebral fractures.20 400 mg daily or placebo for 14 days followed by 76 days of Other bisphosphonates have also been studied for use in calcium and vitamin D supplementation. This three month the prevention of glucocorticoid-induced osteoporosis. In cycle was repeated eight times over a two year period. In the combined results of two 48 week, multinational, the primary measure of outcome a significant diVerence randomised, double blind trials, alendronate significantly between etidronate and placebo was found in the mean increased the bone mineral density of the spine and hip percentage change from baseline in the lumbar spine after relative to baseline and placebo.21 Moreover, in postmeno- two years. Specifically, after six months there was a mean pausal women a lower incidence of vertebral fractures increase of 4.33% in the bone mineral density of the lum- occurred with alendronate. Additionally, alendronate has bar spine for the etidronate group which increased to been investigated for the prevention of glucocorticoid- 5.12% at two years. In contrast, no clinically important induced osteoporosis in patients with sarcoidosis by Gon- changes were reported in patients receiving placebo.14 nelli et al22 who found a significant diVerence from placebo A particular strength of this clinical study is that it repre- in the mean percentage change from baseline in the bone sents one of the few trials using a randomised, double mineral density of patients randomised to receive alendro- blind, placebo controlled design to show the eYcacyofa nate. Lastly, intravenous pamidronate has shown promis- bisphosphonate in glucocorticoid-induced osteoporosis for ing results in preventing bone loss in patients initiating a study population consisting largely of patients with glucocorticoid therapy.23 chronic respiratory disease, mainly asthma. Previous inves- The next question to be answered is whether any tigations have been conducted predominantly in patients particular oral bisphosphonate is truly safer and more with rheumatoid arthritis where the absolute risk of bone eVective in preventing and treating glucocorticoid-induced loss may be unique due to additive eVects from the under- osteoporosis. Until the publication of larger clinical trials lying disease process and diVerences in the cumulative with longer follow up periods the answer to this question 332 Cowan, Morin, Ernst will remain unclear. Both etidronate and alendronate have PIERRE ERNST now been shown to decrease vertebral fractures in Division of Respiratory Medicine, postmenopausal women being treated with McGill University Health Centre, Thorax: first published as 10.1136/thx.53.5.331 on 1 May 1998. Downloaded from 20 21 Montreal, glucocorticoids. In terms of safety, as a class, bisphos- Quebec H3G 1A4, phonates are generally well tolerated. Alendronate has been Canada associated with oesophagitis and oesophageal ulcers in a small percentage of patients, particularly if not taken 1 Adachi JD, Bensen WG, Hodsman AB. Corticosteroid-induced osteoporo- 24 according to the manufacturer’s recommendations. Bone sis. Semin Arthritis Rheum 1993;22:375–84. 2 Reid IR. Glucocorticoid osteoporosis: mechanisms and management. Eur J histomorphometry was found to be normal in patients 1997; :209–17. 24 Endocrinol 137 treated with both continuous alendronate and intermit- 3 Hawker GA. The epidemiology of osteoporosis. J Rheumatol 1996;23(Suppl tent cyclical etidronate.24 Currently, etidronate has re- 45):2–5. 4 Sambrook PN. Corticosteroid induced osteoporosis. J Rheumatol 1996; ceived approval in Britain for the treatment and prevention 23(Suppl 45):19–22. of glucocorticoid-induced osteoporosis; therefore, pending 5 Scientific Advisory Board, Osteoporosis Society of Canada. Clinical practice guidelines for the diagnosis and management of osteoporosis. Can Med the publication of results from ongoing alendronate Assoc J 1996;155:1113–33. studies, it would be prudent to use intermittent etidronate 6 AdinoV AD, Hollister JR. Steroid-induced fractures and bone loss in patients with asthma. N Engl J Med 1983;309:265–8. therapy for this indication. 7 Cooper C, Coupland C, Mitchell M. Rheumatoid arthritis, corticosteroid It is suggested that a preventive strategy be adopted for therapy and hip fracture. Ann Rheum Dis 1995;54:49–52. 8 Suzuki Y, Ichikawa Y, Saito E, et al. Importance of increased urinary calcium all patients with respiratory disease initiating chronic oral excretion in the development of secondary hyperparathyroidism of patients glucocorticoids; this strategy should also be applied to under glucocorticoid therapy. Metabolism 1983;32:151–6. 9 Hodsman A, Adachi J, Olszynski W. Use of bisphosphonates in the patients already receiving chronic oral glucocorticoids with treatment of osteoporosis. Can Med Assoc J 1996;155:945–8. the goal of preventing further bone loss. Consensus guide- 10 Meunier PJ, Confavreux E, Tupinon I, et al. Prevention of
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