The failure of the Persevera study, sponsored by Roche Holding AG’s Genentech unit, disrupts advancement of giredestrant in combination with palbociclib (Ibrance, Pfizer Inc.) as a first-line treatment for ER-positive, HER2-negative, locally advanced or metastatic breast cancer. For competitor Olema Pharmaceuticals Inc., which has palazestrant for the same indication, missing the phase III Persevera primary endpoint of progression-free survival translated to a 25.8% stock slide (NASDAQ:OLMA) to a $16 close on March 9.