Bartsch, R., Korell, M., Pfeiler, G., Gabrysiak, T., Fietz, T. J., Deryal, M., Petersen, V., Resch, T., Schoettker, B., Decker, T., Müller, L., Radosa, J. C., Rhein, U., Glasstetter, M., Klein, D., Buder, A., Krueger, H., Quartier, A., Dzieran, J., Lux, M. P. (2026). Effectiveness outcomes by treatment-free interval among patients receiving palbociclib plus endocrine therapy in HR+/HER2− advanced breast cancer in the real-world setting: Results from the PERFORM study.. Journal of Clinical Oncology. https://doi.org/10.1200/jco.2026.44.16_suppl.1061