A Randomized, Placebo-controlled, Double-blind Study of the Effect of Bondronat Compared With Zoledronic Acid on Pain in Patients With Malignant Bone Disease Experiencing Moderate to Severe Pain

This 2 arm study will compare the efficacy of intravenous Bondronat with that of zoledronic acid in patients with malignant bone disease experiencing moderate to severe pain. Patients will be randomized to receive either Bondronat (6mg iv on days 1, 2 and 3 and then every 3-4 weeks) or zoledronic acid (4mg iv on day 1 and then every 3-4 weeks). The anticipated time of study treatment is 6-12 months, and the target sample size is 100-500 individuals.