BUZZ-AnaptysBio tumbles after latest legal battle over cancer drug

Reuters

11/21

** Shares of drug developer AnaptysBio ANAB.O tumble 14.5% to $32.21 premarket

** GSK's GSK.L oncology unit, Tesaro, sued AnaptysBio late Thursday, claiming the biotech breached a 2014 license deal for cancer drug Jemperli

** Tesaro wants to terminate the agreement, cut royalties by half, and secure permanent rights to Jemperli

** AnaptysBio countersued on Friday, accusing Tesaro of breaking exclusivity rules and favoring other GSK drugs over Jemperli

** Both sides have sought an expedited trial in Delaware, expected in July 2026

** In 2020, AnaptysBio sued GSK over similar exclusivity concerns

** Up to last close, stock up ~184% YTD

(Reporting by Sahil Pandey in Bengaluru)

((Sahil.Pandey@thomsonreuters.com))

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21:51</p>\n</div>\n\n</a>\n\n\n</h4>\n\n</header>\n<article>\n<html xmlns=\"http://www.w3.org/1999/xhtml\"><head><title>BUZZ-AnaptysBio tumbles after latest legal battle over cancer drug</title></head><body><p>** Shares of drug developer AnaptysBio <span>ANAB.O</span> tumble 14.5% to $32.21 premarket</p><p>** GSK's <span>GSK.L</span> oncology unit, Tesaro, sued AnaptysBio late Thursday, claiming the biotech breached a 2014 license deal for cancer drug Jemperli</p><p>** Tesaro wants to terminate the agreement, cut royalties by half, and secure permanent rights to Jemperli</p><p>** AnaptysBio countersued on Friday, accusing Tesaro of breaking exclusivity rules and favoring other GSK drugs over Jemperli</p><p>** Both sides have sought an expedited trial in <a href=\"https://laohu8.com/S/VMM\">Delaware</a>, expected in July 2026</p><p>** In 2020, AnaptysBio sued GSK over similar exclusivity concerns</p><p>** Up to last close, stock up ~184% YTD</p><p> (Reporting by Sahil Pandey in Bengaluru)</p><p> ((Sahil.Pandey@thomsonreuters.com))</p></body></html>\n\n</article>\n</div>\n</body>\n</html>\n","isBrief":false,"type":0,"news_type":1,"symbol":"LU0971552673.USD","symbol_name":"Allianz European Equity Dividend Cl AM DIS H2-USD","start_time":0,"source_url":"https://api.refinitiv.com/data/news/v1/stories/urn:newsml:reuters.com:20251121:nL4N3WX0XM:1","article_id":"2585145048","we_media_id":"1032215980","thumbnails":[],"rights":null,"url":"https://stock-news.laohu8.com/highlight/detail?id=2585145048","pubTimestamp":1763733070,"columns":[],"sourceInfo":null,"weMediaInfo":{"media_name":"Reuters","introduction":"Reuters.com brings you the latest news from around the world, covering breaking news in markets, business, politics, entertainment and technology","home_visible":1,"id":"1032215980","head_image":"https://community-static.tradeup.com/news/4567337cbdf294b657b1fa87c5488b48"},"summary":"BUZZ-AnaptysBio tumbles after latest legal battle over cancer drug** Shares of drug 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