Astellas Pharma Inc. (4503.TO) said Wednesday it will extend the period of its tender offer for OSI Pharmaceuticals Inc. (OSIP) shares to April 23 from March 31, as its continues to attempt to take over the U.S. cancer drug developer.

The Tokyo-based pharmaceutical maker said in statement that 37,858 OSI shares had been tendered by March 30. That accounts for 0.06% of OSI's outstanding shares, a company spokesman said.

Astellas is offering $52 a share, and aims to buy more than 50% of OSI shares.

Astellas said Tuesday it will freeze its OSI takeover attempt through mid-May in exchange for obtaining non-public information from the U.S. company.

-By Kazuhiro Shimamura, Dow Jones Newswires; 813-6269-2790; kazuhiro.shimamura@dowjones.com
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