Astrazeneca plc’s blockbuster Enhertu continued to garner attention as new data released at the American Society of Clinical Oncology (ASCO) annual meeting show the antibody-drug conjugate demonstrated strong progression-free survival in metastatic breast cancer patients. Puma Biotechnology Inc. had advances of its own at ASCO with new biomarker findings from a phase II study of alisertib, an aurora protein kinase 2 inhibitor, in endocrine-resistant metastatic breast cancer.