SLC4A7 and breast cancer: We have demonstrated that NBCn1 transcription in human breast cancer cells is controlled by oncogenic human epidermal growth factor receptor 2 (p95HER2) signaling via the transcription factor Krüppel like factor 4 (KLF4), downstream from phosphatidylinositol-3 kinase (PI3K)/Akt and Ras/Raf/MEK/ERK activation9.