Abstract
8594 Background: Lenvatinib is an oral tyrosine kinase inhibitor targeting VEGFR1-3, FGFR1-4, RET, KIT and PDGFRβ. In phase I studies of lenvatinib partial responses were observed in melanoma as well as thyroid, endometrial, and renal cancers. Methods: Patients (pts) with stage 4 or unresectable stage 3 melanoma were treated in sequential cohorts of escalating doses of lenvatinib by continuous once daily dosing and temozolomide (TMZ) days 1-5 every 28 days. Cohort 1: lenvatinib 20mg, TMZ 100 mg; cohort 2: lenvatinib 24 mg, TMZ 100 mg; cohort 3: lenvatinib 24 mg, TMZ 150 mg. Adverse events were recorded according to CTCAE v3.0 and tumor response assessed according to RECIST 1.0. Results: 32 pts were treated: cohort 1: 6 pts, cohort 2: 4 pts, cohort 3: 22 pts. Demographics: median age: 58; males: 63%. Dose limiting toxicities occurred in 0/6 pts in cohort 3 leading to cohort expansion to a total of 22 pts to enable more extensive assessment of toxicity and a preliminary estimate of efficacy. The most common treatment related adverse events in the cohort 3 were fatigue: 50% (gr3: 9%), hypertension: 50% (gr3: 9%), proteinuria: 50% (no gr3), vomiting: 46% (no gr3), hypothyroidism: 46% (no gr3), anorexia: 41% (no gr3), nausea: 41% (no gr3), diarrhea: 36% (gr3: 5%), thrombocytopenia: 32% (no gr3). No treatment-related gr4 events were reported in these categories. The best overall responses per RECIST were partial responses: 5/22 (23%) for cohort 3 pts and 6/32 (19%) for all pts treated at all dose levels. Six-month progression free survival (PFS) rate was 37% and median PFS was 5.4 months. PK/PD analysis and correlation of response with genetic mutational status (BRAF mutations in 31% pts; NRAS mutations in 19% pts) will be presented. Conclusions: Lenvatinib 24 mg once daily in combination with TMZ 150 mg days1-5 every 28 days was given without apparent worsening of either lenvatinib or TMZ related toxicities. Modest clinical efficacy for this combination was observed.
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