UTO signal co‐localized with CD31‐positive blood vessels; in addition, some signal was seen in the perivascular space with LinTT1‐UTO‐PS, but not with UTO‐PS, suggesting that the drug loaded in the LinTT1‐PS had extravasated and spread into the tumor tissue (Figure 6 A, inset). The gene discussed is PECAM1; the disease is neoplasm.