However, considering that the STEAP1 protein seems to act as a channel for small molecules [2], it is plausible that these drugs may also enter cells through the STEAP1 protein, or the molecules exchange across the cell membranes through the STEAP1 protein result in better uptake of these drugs (or are less extruded from the PCa cells). The gene discussed is STEAP1; the disease is posterior cortical atrophy.