Circulating Tumor Cells Enhance Prognostic Stratification Beyond ER Assessment by Biopsy or FES-PET in Endocrine-Treated Metastatic Breast Cancer. - Eisses B; Angus L; Kuip EJM; Menke-van der Houven van Oordt CW; van der Vegt B; Glaudemans AWJM; Brouwers AH; Oprea-Lager DE; Oyen WJG; Emmering J; Sieuwerts AM; Jager A; et al. (Diagnostics (Basel, Switzerland), 2026)