PART1 and renal cell carcinoma: Exosomal lncARSR promotes RCC resistance to sunitinib by competitively binding to miR‐34/miR‐449 and promoting the expression of AXL and c‐met in RCC cells (Figure 3).[120] Kang et al. demonstrate that lncRNA PART1 is highly expressed in gefitinib‐resistant ESCC cells and is transmitted to sensitive cells by exosomes, thus spreading gefitinib resistance.