For many years, the toxicity associated with the first antibody-drug conjugates (ADCs) kept them away from all but the last lines of treatment for a few hematological cancers. But Gilead Sciences, Inc.'s $21bn acquisition of Immunomedics, Inc. and an initial $1.7bn licensing deal between Seattle Genetics, Inc. and Merck & Co., Inc. the following day has brought ADCs back into the spotlight.
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