SLCO1B3 and neoplasm: For example, compound 4 (Figure 1), an iodinated ICG analog, specifically localizes to tumors in mice bearing liver cancer xenografts likely meditated by OATP1B3.[8] This is an interesting result because iodine‐131 is routinely used alone or conjugated to tumor‐selective molecules as a radiopharmaceutical therapy agent, and iodine‐124 can be used for positron emission tomography (PET) imaging, as well as iodine atoms have a good heavy atom effect and are widely used in photosensitizers.