With respect to hormone receptor positive (HR+) breast cancer, SABCS 2023 featured subgroup analyses of the CheckMate 7FL and KEYNOTE-756 trials evaluating perioperative nivolumab or pembrolizumab in patients with early-stage disease.1,2 Also in early-stage HR+ breast cancer, the final invasive disease free survival (iDFS) analysis of the NATALEE trial was presented evaluating adjuvant ribociclib added to ET.3 In metastatic HR+/HER2- breast cancer, datopotamab deruxtecan was shown to delay disease progression in pre-treated patients.4 In the first line treatment for advanced HR+/HER2- breast cancer, SABCS 2023 featured the overall survival (OS) analysis of the MONARCH-3 trial, while INAVO120 demonstrated a progression-free survival (PFS) benefit for the addition of the PI3Kα inhibitor inavolisib to palbociclib and fulvestrant in patients with PIK3CA-mutated, HR+/HER2- advanced breast cancer.5