SLCO1B3 and colonic neoplasm: However, our results did not identify any functional expression of endogenous Ct-OATP1B3 in colon cancer cells, nor were we able to identify exogenous Ct-OATP1B3 function in HEK293 cells stably expressing Ct-OATP1B3-C or Ct-OATP1B3-v1.