LAS plus Abema treatment was associated with a CBR of 73% and a median PFS of 12.9 mos in the 26 patients with mESR1 (Table).CBRs were 63% in the co-occurring PIK3CA mutation subgroup and 64% in the TP53 mutation subgroup; median PFS times were 7.8 and 8.3 mos, respectively. All patients in the CCND1 and FGFR1 amplification subgroups achieved clinical benefit (CBR 100%) and the median PFS was 16.6 mos for both subgroups....The ELAINE 2 study suggests the potential of LAS plus Abema for treating ESR1-mutated, ER+/HER2- mBC in the post-CDK4/6i setting.