Gilead, Lilly Sue Natco to Block Copies of Zydelig Leukemia Drug

June 24, 2022, 4:24 PM UTC

Gilead Sciences Inc. and Eli Lilly & Co. allege that a generic version of Gilead’s Zydelig proposed by Natco Pharma Ltd. infringes five patents for the leukemia treatment, according to a federal lawsuit in Delaware.

Gilead Calistoga LLC owns three of the patents, and Gilead is the exclusive licensee of two others owned by Lilly’s ICOS Corp. unit, according to a complaint filed Thursday in the US District Court for the District of Delaware.

The Lilly patents expire in July 2025 and August 2025. Of the Gilead patents, two expire in March 2033, and one in September 2033, court ...

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