Talzenna is indicated as...Patients with hormone receptor (HR)-positive breast cancer should have been treated with a prior endocrine-based therapy, or be considered unsuitable for endocrine-based therapy.
Evaluation of Talazoparib, a PARP Inhibitor, in Patients With Somatic BRCA Mutant Metastatic Breast Cancer: Genotyping Based Clinical Trial
Excerpt:
...- Hormone receptor positive, HER2 negative disease with disease progression on at least one prior endocrine therapy in the metastatic setting or be considered inappropriate for endocrine therapy...