NMRK2 and renal cell carcinoma: Additionally, the level of CTSK transcriptional activation by TFE3 may vary among TFE3 fusion proteins.[7, 29] We previously reported NMRK2 as a diagnostic biomarker for TFE3‐RCC,[14] and the present study uncovered SV2B as another diagnostic marker for TFE3‐RCC.