SLC9A1 and cervical cancer: On the other hand, the similar protocol of adding HOE 694 only partially inhibited pHi recovery rate (≈60%) in the human cervical cancer cells, i.e., HeLa cells, as shown in Figure 3C. Therefore, the present results provide clear pharmacological evidence that NHE1 exists functionally in the End1 cells, Ect1 cells, and HeLa cells.