Breast Cancer Clinical Trial
Official title:
Bone Retention of Bisphosphonate (Zometa) in Patients With Multiple Myeloma or Breast Cancer With Metastases to Bone
The investigators major aim is to determine whether there is a difference in the retention of zoledronic acid in multiple myeloma patients, compared to patients with breast cancer metastasis to bone. In addition the investigators wish to analyze if the retention of zoledronic acid is correlated to the extent of bone resorption/formation, and if there is a tendency to changes in retention with sequential treatment.
The clinical benefit from treatment with bisphosphonates has been documented in a large
number of clinical studies, and bisphosphonates are now widely used for treatment of pain
and prevention of bone fractures or vertebral collapse for example in patients with cancer
metastasis to bone or multiple myeloma.
Repeated intravenous administration of the more potent bisphosphonates (pamidronate and
zoledronic acid) are often used for treatment of osteolytic disease caused by disseminated
cancer or multiple myeloma, while the less potent oral bisphosphonates are often prescribed
for treatment of benign osteoporosis. The recommended dose and time schedule for treatment
with the more potent bisphosphonates is based on concerns of avoiding toxicity and at the
same time obtaining maximal clinical benefit. Clinical studies in multiple myeloma and bone
metastasis show significant activity of pamidronate (90 mg by iv infusion during 2-4 hours)
or zoledronic acid (4 mg iv during 15 min) repeated every 4 weeks after a treatment period
of 9 months and beyond, but the optimal duration of treatment is not known. This is a
particular important issue since the use of potent bisphosphonates have been brought in
connection with osteonecrosis.
In the present study we will compare the retention of Zometa with the effect on bone markers
in patients with multiple myeloma or breast cancer with metastases to bone.
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Endpoint Classification: Pharmacokinetics/Dynamics Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment
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