AbbVie's $10.1 billion acquisition of ImmunoGen secures EU approval for Elahere, the first drug for FRα-positive, platinum-resistant ovarian cancer. Elahere, an ADC, was approved in the US in 2022 and received full FDA approval in March. The EU approval ends a 10-year treatment hiatus and shows improved overall survival compared to chemotherapy. The MIRASOL trial supports these findings, with a 33% reduction in death risk and 35% improvement in progression-free survival. Rivals include Eisai's farletuzumab ecteribulin, but Elahere is expected to dominate, with potential sales of $2.8 billion by 2029.