ERBB2 and triple-negative breast carcinoma: No significant differences in PTEN or PTENP1 gene expression were observed in subgroups stratified by ER, HER2, PIK3CA, or TP53 mutation status or by comparison of triple-negative breast cancer (ER/PGR/HER2 negative; TNBC) vs. non-TNBC (data not shown).