AbbVie will pay $10 billion for the biotech firm Immunogen, the company said Thursday, acquiring an approved treatment for ovarian cancer and buying into a burgeoning area of oncology.

Under the agreement, AbbVie will pay $31.26 per share in cash for Immunogen, a nearly 100% premium to the company’s recent trading price. Central to the deal, expected to close in the middle of next year, is Elahere, an Immunogen product that won Food and Drug Administration approval for advanced ovarian cancer in 2022.

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Elahere is among a surging class of cancer medicines called antibody-drug conjugates, or ADCs, which are designed to deliver a targeted dose of chemotherapy directly to tumor cells while sparing healthy tissues. AbbVie’s acquisition is the latest multibillion-dollar deal in the space, following Merck’s $22 billion agreement with ADC specialist Daiichi Sankyo and Pfizer’s $43 billion buyout of Seagen earlier this year.

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