Kyowa Kirin and Ultragenyx to proceed with US regulatory bid for burosumab

31 July 2017

Shares in Japan’s Kyowa Hakko Kirin Co Ltd (TYO: 4151) are up nearly 4% following news that the company will proceed next month with its planned US regulatory submission for burosumab, a monoclonal antibody developed with Californian firm Ultragenyx Pharmaceutical (Nasdaq: RARE).

The biologic is being developed to treat X-linked hypophosphatemia (XLH) and Tumor-induced osteomalacia (TIO), rare diseases connected with excess activity of the hormonal growth factor FGF23.

The companies announced positive Phase III data in XLH in April.

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