Background: The JAVELIN Renal 101 (NCT02684006) phase 3 trial compared first-line treatment with avelumab + axitinib vs sunitinib in aRCC. The trial previously met one of its primary objectives by showing significantly longer progression-free survival (PFS) with avelumab + axitinib vs sunitinib in pts with PD-L1+ tumors; longer PFS, higher objective response rate (ORR), and an acceptable safety profile were also observed in the overall population. OS data were immature. Here we report the final analysis. Methods: Pts with untreated aRCC (any IMDC risk score) were randomized 1:1 to avelumab + axitinib or sunitinib. OS and PFS (by blinded independent central review) in pts with PD-L1+ tumors (SP263 assay) were independent primary endpoints. OS and PFS in the overall population were key secondary endpoints; response and safety were also analyzed. Results: Of 886 pts randomized, 560 (63.2%) had PD-L1+ tumors. At data cutoff (August 31, 2023), median follow-up in the avelumab + axitinib and sunitinib arms was 73.7 and 73.6 months, respectively (≥68 months in all pts). Final efficacy data are shown in the Table. In the avelumab + axitinib and sunitinib arms, grade ≥3 TRAEs occurred in 66.8% vs 61.5%, respectively. Second-line therapy was received by 58.1% vs 69.4%, including a PD-(L)1 inhibitor in 18.8% vs 53.6%, respectively. Conclusions: The JAVELIN Renal 101 trial provides the longest follow-up for immune checkpoint inhibitor + tyrosine kinase inhibitor combination treatment from a phase 3 trial reported to date. OS analyses favored avelumab + axitinib vs sunitinib but did not reach statistical significance. PFS was longer with avelumab + axitinib vs sunitinib, and responses were durable in a subset of pts. Final analysis results confirm the long-term efficacy and manageable safety profile of avelumab + axitinib treatment in pts with aRCC. Clinical trial information: NCT02684006.

DOR, duration of response; HR, hazard ratio *Per investigator assessment (RECIST v1.1).