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Background:   The aim of this study was to evaluate the outcomes of priming salvage radioimmunotherapy (RIT) with a low dose of external beam radiotherapy (EBRT) in patients with relapsed low grade non-Hodgkin lymphoma (LG-NHL).Methods:   Patients who received salvage RIT with or without 2 × 2 Gy EBRT between March 2009 and February 2013 were retrospectively reviewed at a single institution. Planning target volume (PTV) for EBRT was created by adding a 1–2 cm expansion to the gross tumor volume depending on the anatomical location. Kaplan−Meier method via log-rank was employed to analyze the endpoints freedom from progression (FFP) and overall survival (OS).Results:   We identified 22 patients who received salvage RIT without chemotherapy with a median follow up of 34 months. Of these, 9 (41%) patients were treated with EBRT immediately prior to RIT, and 13 (59%) received salvage RIT alone. Median FFP was not reached in patients who underwent combination treatment, while it was 9 months for patients treated with RIT alone ( p = 0.02). OS for all patients at 36 months was 80.3% with no significant difference between the two groups ( p = 0.88). On univariate analysis, the addition of EBRT was associated with improved FFP [hazard ratio (HR) = 4.17; 95% confidence interval (CI), 1.24–19.1; p = 0.02)]. No long term toxicities were reported in both groups.Conclusions:   RIT outcomes and effects were improved with addition of low-dose EBRT immediately prior to it, in the treatment of relapsed LG-NHL with no additional toxicity. This study is hypothesis-generating and the findings should be validated in prospective studies.

Priming radioimmunotherapy with external beam radiation in patients with relapsed low grade non-Hodgkin lymphoma