NR4A1 and breast cancer: When evaluating survival disparities by IHC subtype, mortality rates appear similar between Black and White women with TNBC after adjusting for age, stage, and comorbidities.19,20 In contrast, studies using gene expression assays (specifically, prediction analysis of microarray 50 [PAM50]) among women with hormone receptor (HR)–positive breast cancer suggest an overrepresentation of non–luminal A subtypes in Black women compared with White women.21,22,23,24,25,26