First, we observed that CD3-RORγt+ ILCs are present in low-grade transitional bladder carcinoma in close proximity to CD31+ blood vessels (Figure 6a, panels 1–4) but are barely detected in high-grade bladder carcinoma (Figure 6a, panels 5–8), suggesting a protective role of RORγt-expressing ILCs, at least at early stage of disease. The gene discussed is PECAM1; the disease is urinary bladder carcinoma.