KDR and acute kidney injury: An accurate histologic diagnosis is key to guiding further decision making in patients with metastatic renal cell carcinoma (mRCC) and acute kidney injury (AKI) who have received various systemic anticancer therapy (SACT), such as immune checkpoint inhibitors (ICIs) and vascular endothelial growth factor receptor tyrosine kinase inhibitors (VEGFR-TKI) (1, 2).