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Giredestrant, also known as GDC-9545 and RG6171, is a SERD. GDC-9545 is an orally available selective estrogen receptor degrader/downregulator (SERD), with potential antineoplastic activity. Upon oral administration, SERD GDC-9545 specifically targets and binds to the estrogen receptor (ER) and induces a conformational change that promotes ER degradation.

Giredestrant tartrate (GDC-9545 tartrate), a non-steroidal ER ligand, is an orally active and selective estrogen receptor (ER) antagonist. Giredestrant tartrate potently competes with estradiol for binding and induces a conformational change within the ER ligand binding domain. Anti-tumor activity[1].

Estrogen receptor

[1] C Metcalfe, et al. Abstract P5-04-07: GDC-9545: A novel ER antagonist and clinical candidate that combines desirable mechanistic and pre-clinical DMPK attributes.