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San Diego–based radiopharmaceutical developer RayzeBio has raised $108 million in series C financing, bringing the start-up’s funding to $258 million since it launched in August 2020. RayzeBio is developing macrocycle peptide mimetics that target tumors and deliver radioactive actinium-225. That radioisotope emits α particles that damage nearby cancer cells. AstraZeneca, Bayer, and Novartis have recently made their own investments in experimental therapies that deliver α particle–emitting radioisotopes to tumors.
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