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Original Article
Volume 335:1785-1792 December 12, 1996 Number 24
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Efficacy of Pamidronate in Reducing Skeletal Complications in Patients with Breast Cancer and Lytic Bone Metastases
Gabriel N. Hortobagyi, M.D., Richard L. Theriault, D.O., Lester Porter, M.D., Douglas Blayney, M.D., Allan Lipton, M.D., Clive Sinoff, M.D., Helen Wheeler, M.D., Joseph F. Simeone, M.D., John Seaman, Pharm.D., Robert D. Knight, M.D., Maika Heffernan, Ph.D., Dirk J. Reitsma, M.D., Ian Kennedy, Simon G. Allan, Kathleen Mellars, for The Protocol 19 Aredia Breast Cancer Study Group

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ABSTRACT

Background Bisphosphonates such as pamidronate disodium inhibit osteoclast-induced bone resorption associated with cancer that has metastasized to bone.

Methods Women with stage IV breast cancer who were receiving cytotoxic chemotherapy and had at least one lytic bone lesion were given either placebo or pamidronate (90 mg) as a two-hour intravenous infusion monthly for 12 cycles. Skeletal complications, including pathologic fractures, the need for radiation to bone or bone surgery, spinal cord compression, and hypercalcemia (a serum calcium concentration above 12 mg per deciliter [3.0 mmol per liter] or elevated to any degree and requiring treatment), were assessed monthly. Bone pain, use of analgesic drugs, performance status, and quality of life were assessed throughout the trial.

Results The efficacy of treatment was evaluated in 380 of 382 randomized patients, 185 receiving pamidronate and 195 receiving placebo. The median time to the occurrence of the first skeletal complication was greater in the pamidronate group than in the placebo group (13.1 vs. 7.0 months, P = 0.005), and the proportion of patients in whom any skeletal complication occurred was lower (43 percent vs. 56 percent, P = 0.008). There was significantly less increase in bone pain (P = 0.046) and deterioration of performance status (P = 0.027) in the pamidronate group than in the placebo group. Pamidronate was well tolerated.

Conclusions Monthly infusions of pamidronate as a supplement to chemotherapy can protect against skeletal complications in women with stage IV breast cancer who have osteolytic bone metastases.


Source Information

From the Department of Breast Medical Oncology, University of Texas M.D. Anderson Cancer Center, Houston (G.N.H., R.L.T.); the Saint Thomas Medical Group, Saint Thomas Hospital, Nashville (L.P.); the Saint Vincent Medical Center, Los Angeles (D.B.); the Milton S. Hershey Medical Center, Hershey, Pa. (A.L.); the Northeastern Ontario Regional Cancer Center, Sudbury, Ont., Canada (C.S.); the Department of Clinical Oncology, Royal North Shore Hospital, St. Leonards, Australia (H.W.); the Department of Radiology, Massachusetts General Hospital, Boston (J.F.S.); and Ciba Pharmaceuticals, Summit, N.J. (J.S., R.D.K., M.H., D.J.R.). Other authors were Ian Kennedy, M.D. (Waikato Hospital, Hamilton, New Zealand), Simon G. Allan, M.D. (Palmerston North Hospital, Palmerston North, New Zealand), and Kathleen Mellars, M.S. (Ciba Pharmaceuticals, Summit, N.J.).

Address reprint requests to Dr. Hortobagyi at the Department of Breast Medical Oncology, University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030.

Full Text of this Article


Related Letters:

Pamidronate and Metastatic Breast Cancer
Kao G., Rubiales A. S., Centeno C., Hortobagyi G. N., Theriault R. L., Seaman J.
Extract | Full Text  
N Engl J Med 1997; 336:1609-1610, May 29, 1997. Correspondence

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