We applied the search-based exploration of expression compendium (SEEK) and found that 33P associated with triple-negative phenotype (p = 0.0006) and high-grade breast cancer (p < 0.00001) in two datasets (GSE45255.GPL96 and GSE4922.GPL96), as well as p53 mutations (GSE22093.GPL96; p = 0.038); the p53 association was also found in METABRIC-Discovery, including among luminal A cases (p = 0.02). Here, TP53 is linked to breast cancer.