An expert discusses how third line (3L) systemic therapy for metastatic renal cell carcinoma (mRCC) is guided by prior treatments, patient comorbidities, and drug-specific profiles. Options include tyrosine kinase inhibitors (TKIs; eg, tivozanib, cabozantinib), mTOR inhibitors (eg, everolimus), and immune-oncology– based approaches. Efficacy, tolerability (grade 3/4 adverse events [AEs]), and pharmacokinetic (PK) differences drive selection. Dose modifications, such as for tivozanib and lenvatinib/everolimus, balance efficacy and safety. Selection prioritizes sequencing strategy, with evidence (eg, Pal 2022) supporting reduced-dose efficacy.