Fed. Circ. Erases $41.8M Verdict Over Seagen Cancer Drug IP

By Adam Lidgett · December 2, 2025, 4:53 PM EST

The Federal Circuit in a precedential opinion Tuesday reversed a $41.8 million verdict against Daiichi Sankyo for infringing a Seagen breast cancer treatment patent, saying a lower court should have found...

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Case Information

Case Title

Seagen Inc. v. Daiichi Sankyo Company, Ltd.

Case Number

23-2424

Court

Appellate - Federal Circuit

Nature of Suit

830 Patent Infringement (Fed. Qst.)

Date Filed

September 26, 2023


Case Title

Seagen Inc. v. Daiichi Sankyo, Inc.

Case Number

24-1878

Court

Appellate - Federal Circuit

Nature of Suit

Date Filed

May 29, 2024