LBA64 - Bevacizumab for children with relapsed & refractory high-risk neuroblastoma (RR-HRNB): Results of the BEACON-neuroblastoma randomized phase II trial - A European ITCC-SIOPEN trial

Abstract

BackgroundBEACON-Neuroblastoma is a randomized phase II trial to assess the activity of backbone chemotherapy regimens for children with RR-HRNB and to determine if inhibiting angiogenesis with bevacizumab adds to the activity of this chemotherapy. MethodsPatients aged 1-21 years with RR-HRNB with adequate organ function and performance status were randomized in a factorial design to: temozolomide (T) versus irinotecan-temozolomide (IT) or topotecan-temozolomide (TTo), with or without bevacizumab (Bev). The Bev randomization (Bev versus no-Bev) had two parts: Part 1 had a 2-stage Minimax Jung design with overall response (OR) as primary endpoint. Part 1 success criterion was ≥4 more responses in Bev arm compared to no-Bev. Protocol was amended to incorporate Part 2 (40 additional patients), including progression-free survival (PFS) as co-primary endpoint. OR was defined as complete or partial response (CR, PR) by RECIST (INRC for patients without measurable disease). OR and toxicity data for the Bev randomization is reported. ResultsFor Part 1 (n=106), 17 of 52 pts on Bev had responses [33%] and 8 of 54 pts on no-Bev had responses [15%]. The trial success criterion for the primary endpoint of ORR was met. Including Part 2 (total n=154), 21 of 77 patients on Bev (7CR, 14PR) and 13 of 77 patients on no-Bev (1CR, 12PR) had responses. Response data was not available for 6 patients; 13 patients not assessable for response (discontinued before first assessment) were considered to be non-responders. OR rate [with 90% CI] was 27% [18-35%] for patients on Bev and 17% [10-24%] for patients on no-Bev. In subgroup analysis, there was no interaction between T, IT and TTo and treatment with/without Bev (heterogeneity test, p=0.8). 86% Bev and 58% no-Bev patients had grade ≥3 toxicities as per CTCAE v4.0; the most common grade ≥3 toxicities associated with Bev were platelet count decrease and anemia. ConclusionsBev reached the Phase II success criterion for OR within Part 1 of the trial when added to temozolomide-based chemotherapy in RR-HRNB. The toxicity profile for Bev is acceptable. Longer follow-up is needed before assessing whether it impacts PFS or overall survival. Clinical trial identificationNCT02308527; EudraCT: 2012-000072-42. Legal entity responsible for the studyUniversity of Birmingham. FundingRoche. DisclosureL. Moreno: Honoraria (self), Travel / Accommodation / Expenses: Celgene; Honoraria (self), Advisory / Consultancy: Novartis; Advisory / Consultancy: AstraZeneca; Advisory / Consultancy: Roche; Advisory / Consultancy: Bayer; Advisory / Consultancy, Travel / Accommodation / Expenses: Amgen; Advisory / Consultancy, Travel / Accommodation / Expenses: Mundipharma; Licensing / Royalties, I am member of Siopen Executive Committee, Siopen receives royalties for the sales of dinutuximab beta: Eusa Pharma. D. Valteau-Couanet: Advisory / Consultancy, Travel / Accommodation / Expenses, Licensing / Royalties, Member of Siopen Executive Committee, SIOPEN receives royalties for the sales of dinutuximab beta: Eusa Pharma; Research grant / Funding (institution): Ophelia; Travel / Accommodation / Expenses: Jazz Pharma. K. Nysom: Advisory / Consultancy: Bayer. N. Gerber: Research grant / Funding (institution): AbbVie; Research grant / Funding (institution): Loxo; Research grant / Funding (institution): Novartis. R. Ladenstein: Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (institution), Travel / Accommodation / Expenses, Licensing / Royalties, Royalties to the institution for dinutuximab beta: Apeiron; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (institution), Travel / Accommodation / Expenses, Licensing / Royalties, Royalties to the institution for dinutuximab beta: Eusa Pharma; Honoraria (self), Advisory / Consultancy: Boehringer Ingelheim. A.D. Pearson: Honoraria (self), Advisory / Consultancy: Boehringer Ingelheim; Honoraria (self), Advisory / Consultancy: Genentech. All other authors have declared no conflicts of interest.