A Prospective Non-interventional Real-World Study of cabozantinib in Pretreated Patients With Advanced Renal Cell Carcinoma Refractory to Vascular Endothelial Growth Factor-Targeted Therapy (CASSIOPE)

Abstract

Background There is a lack of published data on real-world cabozantinib use in patients with advanced renal cell carcinoma after prior vascular endothelial growth factor (VEGF)-targeted therapy. Methods CASSIOPE was a real-world, prospective, multicenter, non-interventional postauthorization safety study of cabozantinib in adult patients with advanced renal cell carcinoma in Europe following prior VEGF-targeted treatment (NCT03419572). Endpoints included cabozantinib utilization (dose modifications due to adverse events [AEs; primary endpoint], dose, dose modifications, and treatment duration), safety, effectiveness (progression-free survival [PFS], overall survival [OS], best overall response [BOR]), and healthcare resource utilization. Findings Full analysis set (FAS)/safety population comprised 679 patients; 433 of these initiated cabozantinib at 60 mg/day (recommended dose) (primary safety population). Median age (FAS) was 67 (range, 29-93) years; most were male (73·0%), had clear-cell histology (85·7%), metastatic disease at cabozantinib initiation (97·8%), and prior nephrectomy (80·3%). In the primary safety population, 77·1% experienced dose modification owing to an AE. In the safety population, the median daily dose was 40·0 (range, 7·8-60·0) mg/day and the median treatment duration was 7·8 (< 0·1-15·2) months. Treatment-emergent and treatment-related AEs were experienced by 95·9% and 90·4% of patients, respectively. Median PFS (FAS) assessed by the local investigator using any method was 8·3 months, and 1-year OS rate was 74%. Approximately one-third of all patients had a BOR of partial response and 6 had a complete response. Interpretation Second- or later-line cabozantinib was effective and manageable in a real-world setting and had a safety profile consistent with previous studies.