A cancer-type variant with a distinct 5′region, termed cancer-type (ct)-SLCO1B3 coding for the cancer-type (ct)-OATP1B3 transporter was identified as the main OATP1B3 variant in colon, lung (Sun et al., 2014) pancreatic (Thakkar et al., 2013), and also ovarian cancer (Alam et al., 2018). The gene discussed is SLCO1B3; the disease is cancer.