Radiotherapy for Advanced Hodgkin Lymphoma with Initial Bulk: A Combined Analysis of Two Randomized Trials.

Area of Science:

• Oncology
• Radiation Oncology
• Clinical Trials

Background:

• The role of consolidative radiation therapy (RT) in advanced Hodgkin lymphoma with bulky disease remains uncertain.
• Previous randomized controlled trials (RCTs) did not demonstrate a benefit for consolidative RT after chemotherapy.
• Limited sample sizes in prior studies may have reduced statistical power to detect a small benefit.

Purpose of the Study:

• To evaluate the efficacy of consolidative RT in patients with advanced Hodgkin lymphoma and bulky disease who achieved a metabolic complete response.
• To compare progression-free survival (PFS) in patients randomized to no RT versus RT to the site of initial bulk.

Main Methods:

• A secondary analysis of two phase 3 RCTs (GITIL/FIL HD0607 and FIL HD0801) using reconstructed patient data.
• Intent-to-treat (ITT) and per-protocol (PP) analyses were performed.
• Progression-free survival (PFS) was compared between groups using the log-rank test.

Main Results:

• A total of 412 patients (ITT) and 373 patients (PP) were analyzed.
• Five-year ITT PFS was 90.1% for both no RT and RT groups (P = .81).
• Five-year PP PFS was 90.9% for no RT and 92.9% for RT (P = .31), with no significant difference observed across bulky disease subgroups.

Conclusions:

• Consolidative RT to initial bulky nodal sites does not improve PFS in advanced Hodgkin lymphoma patients with a metabolic complete response post-chemotherapy.
• The findings suggest that RT is not associated with a PFS benefit in this specific patient population.
• This analysis provides further evidence regarding the role of RT in managing bulky Hodgkin lymphoma.