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AstraZeneca backs Summit with $2 billion stake and cancer-drug collaboration

AstraZeneca agreed to invest $2 billion in Summit Therapeutics through convertible preferred shares, rather than buying the company outright. The shares imply a price of $18.36 per common share—an 18.6% premium to Summit’s closing price on the announcement day. After the investment, AstraZeneca would hold rights equivalent to about 12% of Summit’s outstanding common stock, or roughly 10.6% on a fully diluted basis. The investment is tied to clinical collaboration around ivonescimab, Summit’s cancer drug licensed from China’s Akeso. Ivonescimab targets PD-1 and VEGF, two pathways involved in cancer growth and immune evasion. The companies plan to test ivonescimab with AstraZeneca’s antibody-drug conjugate sonesitatug vedotin in gastrointestinal cancers, and have outlined a broader, nonbinding program to study combinations with other AstraZeneca cancer medicines. Each company retains development and commercial rights to its own medicines, and they will contribute their drugs and ...

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