Welcome to the Reuters.com BETA. Read our Editor"s note on how we"re helping professionals make smart decisions. June 3, 2021 5:25 PM EET Healthcare & Pharmaceuticals Bristol-Myers is sued for $6.4 billion over delayed cancer drug Jonathan Stempel 3 minute read A sign stands outside a Bristol Myers Squibb facility in Cambridge, Massachusetts, U.S., May 20, 2021. REUTERS/Brian Snyder/File Photo 1/2 A sign stands outside a Bristol Myers Squibb facility in Cambridge, Massachusetts, U.S., May 20, 2021. REUTERS/Brian Snyder/File Photo Bristol Myers Squibb Co (BMY.N) was sued for $6.4 billion on Thursday for allegedly delaying its Breyanzi cancer drug to avoid payments to shareholders of the former Celgene Corp, which the drugmaker bought in 2019. According to a complaint in Manhattan federal court, Bristol Myers failed to use contractually required "diligent efforts" to win U.S. Food and Drug Administration approval for the non-Hodgkin lymphoma drug by a Dec. 31, 2020, deadline. By missing the deadline, Bristol Myers was excused from owing an additional $9 in cash to Celgene shareholders for each share they held, enabling it to acquire Celgene at an "enormous discount" and enjoy a "windfall," the complaint said. Bristol Myers bought Celgene for $80.3 billion in cash and stock in November 2019. It won FDA approval for Breyanzi, whose chemical name is lisocabtagene maraleucel, on Feb. 5. The lawsuit was brought by UMB Bank NA, acting as a trustee for Celgene"s former shareholders. "We will not be commenting on pending litigation," Bristol Myers said in a statement. The $9 per share "milestone" payment had been contingent on New York-based Bristol Myers winning FDA approval by specified deadlines for three drugs that Celgene had been developing. UMB said Bristol Myers withheld or belatedly submitted critical information to the FDA for Breyanzi"s approval, and did not prepare its manufacturing plants for required inspections. "Other cellular therapies based on similar technology have received FDA approval without the issues and ineptitude that plagued Bristol Myers, and in substantially less time," UMB said. A lawyer for the Kansas City, Missouri-based bank declined additional comment. Bristol Myers won FDA approval for the two other Celgene drugs, Zeposia for multiple sclerosis and Abecma to treat multiple myeloma, by the specified deadlines. The case is UMB Bank NA v Bristol-Myers Squibb Co et al, U.S. District Court, Southern District of New York, No. 21-04897.