ArticleAdvances in radiation oncology2026
Heterogeneous Radioimmunotherapy for Bulky Tumors: A Phase 1 Trial for Advanced Non-Small Cell Lung Cancer.
Article in Advances in radiation oncology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT05615142 (Phase I Study of Low Dose Radiotherapy and Concurrent SBRT in Combination With PD-1 Inhibitors in Advanced Non-small Cell Lung Cancer), which is not on this map. Not yet cited in PubMed.
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Phase I Study of Low Dose Radiotherapy and Concurrent SBRT in Combination With PD-1 Inhibitors in Advanced Non-small Cell Lung Cancer (NSCLC) .
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30 authors.
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Abstract
Purpose: Inoperable bulky tumors remain challenging to treat with chemotherapy, radiation therapy (RT), or immune checkpoint inhibitors. We developed a novel heterogeneous RT technique with an eclipse-shaped dose distribution (EclipseRT, ERT) by embedding partial-tumor stereotactic body RT (immunogenic) within a low-dose RT (immunomodulatory) field targeting the gross tumor volume. In our previous study, we demonstrated that ERT plus anti-programmed cell death protein 1 (αPD-1) (iERT) activated the natural killer/DC/CD8⁺ T-cell axis, triggering potent antitumor immunity against bulky tumors in mouse tumor models. Here, we report a phase 1 trial to evaluate the safety and feasibility of iERT for advanced non-small cell lung cancer (NSCLC). Methods and Materials: This phase 1 trial (NCT05615142, iERT-01) employed a 3 + 3 dose-escalation design. Patients with stage IV NSCLC and bulky tumors (>5 cm) who had failed standard therapy, were ineligible for standard therapy, or declined standard therapy were enrolled. iERT was delivered in 1 to 3 fractions of 10 Gy stereotactic body RT plus 2 Gy low-dose RT with anti-programmed cell death protein 1 (αPD-1). The primary endpoint of the iERT-01 trial was safety and tolerability. Key secondary endpoints included objective response rate, progression-free survival, and overall survival. Results: A total of 9 patients with bulky NSCLC were included. The median follow-up was 22.3 months. iERT was well tolerated, with no dose-limiting toxicities observed. Overall, 7 of 9 patients (77.8%) experienced at least 1 adverse event, and 7 of 9 (77.8%) experienced treatment-related adverse events, all of which were grade 1 or 2. Moreover, it demonstrated encouraging antitumor activity, achieving an objective response rate of 55.6% (5 of 9), with a median progression-free survival of 12.6 months and a median overall survival of 26.4 months. Conclusions: iERT demonstrated favorable safety and feasibility in this phase 1 trial for advanced bulky NSCLC. Larger-cohort studies with optimized dose regimens are still warranted to further validate the novel strategy.
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