Immunohistochemical (IHC) analysis of cancer FFPE tissues using an FLRT3 monoclonal antibody (mAb) showed the highest membrane FLRT3 expression on papillary renal cell cancer (RCC) and clear cell RCC (Fig. 4, A and B), with less expression on other tumor types (Fig. 4B). Here, FLRT3 is linked to papillary renal cell carcinoma.