964PLenvatinib (Len) alone or in combination with everolimus (Eve) in heavily pretreated patients (pts) with metastatic renal cell carcinoma (mRCC) after immune checkpoint inhibitors (ICI) and VEGFR-targeted therapies: A single-institution experience

Abstract Background ICI and VEGFR-targeted therapies are the primary treatments for mRCC. Len plus Eve is currently approved based on improved progression-free survival (PFS) in pts with progressive disease after one prior VEGFR-targeted therapy. However, its efficacy beyond second-line, and after ICI, is not well defined. Methods We conducted a retrospective study of pts with mRCC who were treated with Len alone, or in combination with Eve, after at least 2 prior lines of therapy, including ICI and VEGFR-TKI. We report clinical benefit (CB), defined as partial response (PR) + stable disease (SD), PFS, overall survival (OS), and adverse events (AE). Results Between 11/2016 and 2/2019, we identified 40 pts with mRCC who were treated with Len +/- Eve. Median age was 59 years (range, 34-76); 62.5% were male; 52.5% had ECOG PS 1 and 35% had ECOG PS 2; 77.5% had clear cell histology; 85% had prior nephrectomy and 95% had metastatic disease in >/= 3 sites; 2.5% had IMDC favorable-risk, 87.5% intermediate-risk, and 10% poor-risk disease. The median number of prior lines of therapy was 4 (range, 2-10); 70% received Len+Eve and 62.5% were treated with Len +/- Eve as 5th-line or later. All pts had prior ICI exposure, primarily nivolumab monotherapy (70%), and 87.5% received >/= 2 prior VEGFR-TKIs. CB was achieved in 67.5% (30% PR + 37.5% SD). At a median follow up of 8.5 months (mo), median PFS was 4.2 mo (95% CI, 3.4-6.5), with a 6-mo PFS probability of 34% (95% CI, 21%-54%). Median OS was 10.8 mo (95% CI, 5.4-13.3), with a 1-year OS probability of 37% (95% CI, 21%-65%). Twenty-three pts (57.5%) have died, and of those only 4 received further therapies after Len +/- Eve. Dose reduction was required in 45% of pts, and the most common grade 3 or 4 AEs were proteinuria (17.5%), fatigue (10%), and diarrhea (10%). Treatment was discontinued in 4 pts (10%) because of toxicity. Conclusions Len alone and in combination with Eve demonstrated clinical benefit, with an overall response rate of 30%, and was well tolerated in heavily pretreated pts with mRCC after prior ICI and VEGFR-targeted therapies, supporting its use in this patient population. Legal entity responsible for the study The authors. Funding Has not received any funding. Disclosure Z. Lim: Speaker Bureau / Expert testimony: Exelixis. M.T. Campbell: Honoraria (self), Advisory / Consultancy: Eisai; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (self), non-branded educational programs: EMD Serono; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (self), non-branded educational programs: Pfizer; Honoraria (self), Advisory / Consultancy: Genentech; Honoraria (self), Advisory / Consultancy: AstraZeneca; Advisory / Consultancy: Apricity Health; Research grant / Funding (self): Exelixis; Research grant / Funding (self): Janssen; Speaker Bureau / Expert testimony, non-branded educational programs: Bristol-Meyers Squibb; Speaker Bureau / Expert testimony, non-branded educational programs: Roche; Speaker Bureau / Expert testimony, non-branded educational programs: Merck. A.Y. Shah: Honoraria (self), Research grant / Funding (self): Eisai; Honoraria (self): Oncology Information Group; Honoraria (self): Roche; Research grant / Funding (self): Bristol-Myers Squibb; Research grant / Funding (self): EMD Serono. A. Zurita Saavedra: Speaker Bureau / Expert testimony: McKesson Specialty Health; Speaker Bureau / Expert testimony: Janssen-Cilag, S.A.DEC.V.; Advisory / Consultancy: Incyte; Advisory / Consultancy: Pfizer. E. Jonasch: Advisory / Consultancy, Research grant / Funding (self): Exelixis; Advisory / Consultancy, Research grant / Funding (self): Novartis; Research grant / Funding (self): Peloton; Advisory / Consultancy, Research grant / Funding (self): Pfizer; Advisory / Consultancy: Eisai; Advisory / Consultancy: Genentech; Advisory / Consultancy: Ipsen; Advisory / Consultancy: Roche. N.M. Tannir: Honoraria (self), Advisory / Consultancy, Travel / Accommodation / Expenses: Pfizer; Honoraria (self), Advisory / Consultancy, Research grant / Funding (self), Travel / Accommodation / Expenses: Novartis; Honoraria (self), Advisory / Consultancy, Research grant / Funding (self), Travel / Accommodation / Expenses: Bristol-Myers Squibb; Honoraria (self), Advisory / Consultancy, Research grant / Funding (self), Travel / Accommodation / Expenses: Exelixis; Honoraria (self), Advisory / Consultancy, Travel / Accommodation / Expenses: Nektar; Honoraria (self), Advisory / Consultancy, Travel / Accommodation / Expenses: Calithera Biosciences Inc.; Honoraria (self), Advisory / Consultancy, Travel / Accommodation / Expenses: Eisai Medical Research; Honoraria (self), Advisory / Consultancy, Travel / Accommodation / Expenses: Ono Pharmaceutical; Advisory / Consultancy, Travel / Accommodation / Expenses: Oncorena; Research grant / Funding (self): Epizyme; Research grant / Funding (self): Mirati Therapeutics. All other authors have declared no conflicts of interest.