Pfizer Inc.’s appetite for acquisitions shows no signs of abating as it announced this morning its plan to acquire biotech Seagen Inc. for a whopping $43 billion in a move that will double the size of its early stage oncology pipeline. Under the deal, unanimously approved by the boards of directors of both firms, Pfizer will pay Seagen $229 per share. Bothell, Wash.-based Seagen expects to amass $2.2 billion in revenue in 2023, representing 12% year-on-year-growth, royalties and collaboration and license agreements from its four, FDA-approved products for the treatment of solid tumors and hematologic malignancies, antibody-drug conjugate drugs Adcetris (brentuximab vedotin), Padcev (enfortumab vedotin) and Tivdak (tisotumab vedotin), and tyrosin kinase inhibitor Tukysa (tucatinib).