Role of radiotherapy to bulky sites of advanced Hodgkin lymphoma treated with ABVD: final results of FIL HD0801 trial.

ABSTRACT: The role of consolidation radiotherapy (RT) to bulky lesions is controversial for advanced-stage Hodgkin's lymphoma (HL) patients achieving complete metabolic response (CMR) after ABVD-based chemotherapy. Herein we present the final results of the Fondazione Italiana Linfomi HD0801 trial, investigating the potential benefit of RT in that particular setting. In this phase III randomized study, patients with a bulky lesion at baseline (mass with the largest diameter ≥5 cm) achieving CMR after 2 and 6 ABVD cycles were randomly assigned 1:1 to RT vs observation with a primary endpoint of event-free survival (EFS) at two years. The sample size was calculated estimating an EFS improvement for RT of 20% (from 60% to 80%). The secondary endpoint was progression-free survival (PFS). One-hundred and sixteen (116) patients met the inclusion criteria and were randomized. Intention-to-treat (ITT) analysis showed a 2-year EFS of 87.8% vs. 85.8% for RT vs. observation, respectively (HR:1.5, CI:0.6-3.5, p=0.34). Per-protocol (PP) analysis showed a 2-year EFS of 89.6% vs. 85.8%, respectively (HR:1.19, CI:0.47-3.02, p=0.71). At 2 years, ITT PFS was 91.3% vs. 85.8% (HR:1.2, CI:0.5-3, p=0.7), while PP PFS was 93.8% vs. 85.8% (HR:0.7, CI:0.2-2.1, p=0.52) for RT vs observation, respectively. Our study showed that patients in CMR randomized to observation have a very good outcome and the primary endpoint of a 20% benefit in EFS for RT was not met. However, the sample size was under-powered to detect a benefit of 10% or less, keeping open the question on potential, more limited, role of RT in this setting. This trial was registered at www.clinicaltrials.gov as # NCT00784537.

SUBMITTER: Ricardi U 

PROVIDER: S-EPMC8579271 | biostudies-literature |

REPOSITORIES: biostudies-literature