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Press release content from Globe Newswire. The AP news staff was not involved in its creation.

Portnoy Law: Lawsuit Filed On Behalf of Sesen Bio, Inc. Investors

August 27, 2021 GMT

Clickhereto join the case

LOS ANGELES, Aug. 27, 2021 (GLOBE NEWSWIRE) -- The Portnoy Law Firm advises investors that a class action lawsuit has been filed on behalf of Sesen Bio, Inc. (“Sesen” or “the Company”) (NASDAQ : SESN) investors that acquired securities between December 21, 2020 and August 17, 2021.

Investors are encouraged to contact attorney Lesley F. Portnoy, to determine eligibility to participate in this action, by phone 310-692-8883 or email, or click here to join the case.


It is alleged in this complaint that Sesen failed to disclose to investors: (1) that Sesen Bio’s clinical trial in relation to Vicineum had more than 2,000 violations of trial protocol, which included 215 classified as “major”; (2) that three of Sesen Bio’s clinical investigators were convicted of “serious noncompliance,” which included “back-dating data”; (3) that Sesen Bio had submitted the tainted data in relation to the BLA for Vicineum; (4) that Sesen Bio’s clinical trials found that Vicineum leaked out into the body, which led to side effects including liver failure and liver toxicity, and increasing the risks for fatal, drug-induced liver injury; (5) that, as a result of the foregoing, t was not likely Sesen’s BLA for Vicineum would be approved; (6) that, as a result of the foregoing, there was a reasonable likelihood that additional trials would be required to be conducted to support the efficacy and safety of Vicineum; and (7) that, as a result of the foregoing, Sesen’s positive statements in regard to Sesen’s business, operations, and prospects were materially misleading and/or lacked a reasonable basis.

Please visit our website to review more information and submit your transaction information.


The Portnoy Law Firm represents investors in pursuing claims arising from corporate wrongdoing. The Firm’s founding partner has recovered over $5.5 billion for aggrieved investors. Attorney advertising. Prior results do not guarantee similar outcomes.

Lesley F. Portnoy, Esq.
Admitted CA and NY Bar

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