SLC7A5 and renal cell carcinoma: Given the decreased expression of miR-126 observed in the tumors of renal cell carcinoma patients who experienced metastasis [164] or recurrence [165], the positive feedback circuit featuring tumorigenic miR-126 deactivation, increased expression of solute carrier family 7, member 5 (SLC7A5) and SEPRINE1, and stimulated mTOR-dependent HIF1/2α translation has been confirmed to advance metastasis and therapeutic resistance in clear cell renal cell cancer [166], which also enriches the understanding of the effects of HIF-1α translation in the feedback pathway.