Giredestrant (GDC-9545) is under development by Roche/Genentech. Giredestrant is a potent, next generation investigational selective oestrogen receptor (SERD) with best-in-class potential. In the phase 2 coopERA trial, postmenopausal patients with untreated ER+/HER2- early breast cancer were randomly assigned to receive neoadjuvant combination therapy with palbociclib and giredestrant or anastrozole, followed by surgical intervention within 14 days. The tumor biomarker Ki67 of the patients was ≥ 5% when they were enrolled in the group. The analysis showed that patients receiving giredestrant combination therapy (mean Ki67 reduction of 80%) had a greater mean reduction in Ki67 levels from baseline at week 2 compared with anastrozole combination therapy (mean Ki67 reduction of 67%). The pivotal phase 3 trial of giredestrant is recruiting patients and preliminary data is expected in 2025.
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