BRUSSELS--Belgian pharmaceutical company UCB (UCB) and global biotechnology firm Amgen Inc. (AMGN) said Wednesday that a trial of a new drug to treat osteoporosis in postmenopausal women demonstrated a significant increase in bone mineral density.

The advanced Phase II trial for Romosozumab, which does not yet have regulatory clearance, showed significant increases in bone density in the lumbar spine, hip and neck bones, compared with alternative treatments. The increased bone density were also observed after three months, the companies said, citing a study published in the New England Journal of Medicine.

Amgen and UCB are collaborating on the development of Romosozumab for the treatment of bone-related conditions, including post-menopausal osteoporosis.

"The results of the study demonstrate significantly increased BMD and stimulation of bone formation with Romosozumab treatment in women with postmenopausal osteoporosis," said Michael McClung, M.D., director of the Oregon Osteoporosis Center and lead study investigator, in a statement issued by the companies.

UCB was up 0.4% at EUR54.38 after the market opened Thursday. Amgen closed at $114.08 Dec. 31.

Write to Laurence Norman at Laurence.Norman@wsj.com

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