Roche AG’s Genentech unit landed another clinical victory with giredestrant that provided a major stock boost for competitor Olema Pharmaceuticals Inc. Made public were positive phase III data from the Lidera study testing selective estrogen receptor degrader and complete estrogen receptor antagonist (CERAN) as an adjuvant endocrine treatment for people with ER-positive, HER2-negative, early stage breast cancer (BC).

Eli Lilly and Co.’s oral selective estrogen receptor degrader (SERD) imlunestrant has been approved by the U.S. FDA for treating late-stage breast cancer patients. Branded Inluriyo, the second-line treatment is for treating adults with estrogen receptor-positive, human epidermal growth factor receptor-2-negative estrogen receptor 1-mutant advanced or metastatic breast cancer.

Astrazeneca plc’s good news with its oral selective estrogen receptor degrader (SERD) and estrogen receptor antagonist, camizestrant, when used as part of a combo in breast cancer raised optimism for the approach, which has caught on in various biopharma quarters.

Aromatase inhibitors (AI) are among the most widely used therapies in the treatment of breast tumors expressing estrogen receptor α (ERα). Alone or in combination with other agents, they are the standard of care for hormone receptor-positive tumors.

Winning the race to market with the first oral selective estrogen receptor degrader (SERD) for breast cancer is Menarini Group’s elacestrant, which gained U.S. FDA approval for use as second- and third-line therapy in patients with ER-positive/HER2-negative advanced or metastatic disease with the ESR1 mutation. It marks the first therapy approved specifically targeting ESR1, found in up to 40% of patients with ER-positive/HER2-negative disease.