In renal cell carcinoma (RCC), RCC-derived exosomes had an lncRNA Ars operon (ARSR) that promoted macrophage polarization, cytokine release, phagocytosis, angiogenesis, and tumor development by sponging miR34/miR-449 and upregulating the signal transducer and activator of transcription 3 (STAT3) pathway [108]. Here, STAT3 is linked to renal cell carcinoma.