Journal of Clinical Oncology, Vol 11, 59-65, Copyright © 1993 by American Society of Clinical Oncology
Double-blind controlled trial of oral clodronate in patients with bone metastases from breast cancer
AH Paterson, TJ Powles, JA Kanis, E McCloskey, J Hanson and S Ashley
Department of Medicine, Tom Baker Cancer Center, Calgary, Alberta, Canada.
PURPOSE: Osteolytic metastases often give rise to hypercalcemia, fracture,
and bone pain, and occur commonly in patients with recurrent breast cancer.
We assessed the bisphosphonate, clodronate, which has proven to be a useful
treatment for hypercalcemia and may be a potent inhibitor of tumor-induced
osteolysis, for its effect on reducing the osseous complications of
metastatic breast cancer. PATIENTS AND METHODS: We studied 173 patients
with bone metastases due to breast cancer in a randomized, double-blind,
placebo-controlled trial of oral clodronate 1,600 mg/d (85 patients)
compared with an identical placebo (88 patients). RESULTS: The patients in
each wing were comparable in their clinical, radiologic, and biochemical
characteristics at trial entry. In patients who received clodronate, there
was a significant reduction compared with placebo in the total number of
hypercalcemic episodes (28 v 52; P < .01), in the number of terminal
hypercalcemic episodes (seven v 17; P < .05), in the incidence of
vertebral fractures (84 v 124 per 100 patient-years; P < .025), and in
the rate of vertebral deformity (168 v 252 per 100 patient-years; P <
.001). The combined rate of all morbid skeletal events was significantly
reduced (218.6 v 304.8 per 100 patient-years; P < .001). Trends were
seen in favor of clodronate for nonvertebral fracture rates and
radiotherapy requirements for bone pain (particularly spinal pain). No
significant survival differences and no significant differences in side
effects were observed between the two groups. CONCLUSIONS: These findings
indicate that oral clodronate has a beneficial effect on the skeletal
morbidity associated with breast cancer and should be considered as
antiosteolytic therapy in affected patients. It deserves further
investigation as an adjuvant therapy in operable breast cancer and in
patients with nonosseous recurrence who are at high risk for bone
metastases.
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