SLCO1B3 and spindle cell hemangioma: The effects of bortezomib on OATP1B3-mediated transport in HEK293-OATP1B3 cells were determined using all three substrates, [3H]CCK-8, [3H]E217βG and [3H]pitavastatin, and in human SCH using [3H]CCK-8 as the probe substrate.