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Radiation

Radiation is an international, peer-reviewed, open access journal on scientific advances and applications of radiotherapy, immunotherapy, radiology and radiation technologies across multiple fields, published quarterly online by MDPI.

All Articles (140)

Radiopharmaceutical therapy (RPT) offers tumor-selective radiation delivery and represents a promising platform for combination with immune checkpoint inhibitors (ICIs). While prior studies suggest that RPT can stimulate antitumor immunity, synergy with ICIs may depend on radionuclide properties, absorbed dose, and radiation distribution within the tumor microenvironment. This study evaluated how radionuclide selection and dose influence immune stimulation and therapeutic efficacy of GD2-targeted antibody-based RPT combined with ICIs. Dinutuximab, an anti-GD2 monoclonal antibody, was radiolabeled with β-emitters (90Y, 177Lu) or an α-emitter (225Ac). C57Bl6 mice bearing GD2+ tumors received 4 or 15 Gy tumor-absorbed doses, determined by individualized dosimetry, with or without dual ICIs (anti-CTLA-4 and anti-PD-L1). In vivo imaging, ex vivo biodistribution, survival, histological, and gene expression analyses were performed to assess therapeutic and immunological outcomes. All radiolabeled constructs demonstrated preferential uptake in GD2+ tumors. Combination therapy improved survival in a radionuclide- and dose-dependent manner, with the greatest benefit in the 225Ac + ICI group at 15 Gy. Treatment activated type I interferon signaling and increased MHC-I and PD-L1 expression. Notably, 90Y reduced regulatory T cells, enhancing CD8+/Treg ratios, while 225Ac induced robust interferon-driven activation. Radionuclide selection and absorbed dose critically shape immune and therapeutic outcomes of antibody-based RPT combined with ICIs, underscoring the importance of delivery mechanism and dose optimization in combination therapy strategies.

9 December 2025

Imaging, uptake, and distribution of 89Zr-DFO-dinutuximab, 177Lu-DTPA-dinutuximab, and 225Ac-macropa-dinutuximab. (A) Schematic representation of the radiolabeling process. The chimeric anti-GD2 monoclonal antibody dinutuximab was conjugated with the appropriate chelators labeled in green-deferoxamine (DFO) for 89Zr, diethylenetriaminepentaacetic acid (DTPA) for 177Lu, and macropa for 225Ac-via thiourea bond. Radiolabeling was performed under mild conditions (pH 5.5–7.0) for 1 h at 37 °C. (B) Bilateral tumor-bearing C57BL/6 mice were used, with syngeneic GD2-negative (yellow arrow) and GD2-positive (white arrow) B16/B78 melanoma or 9464D/9464D:GD2+ neuroblastoma tumors implanted on the left and right flanks. Tumors were allowed to reach ~180 mm3 before radiopharmaceutical administration. (C) Longitudinal PET/CT imaging of mice injected with 89Zr-DFO-dinutuximab (∼9.25 MBq) was performed at 4, 24, 72, and 168 h post-injection. (D) Serial SPECT/CT imaging of 177Lu-DTPA-dinutuximab (∼18.5 MBq) was performed at 24, 72, 168, and 336 h post-injection. (E) For 225Ac-macropa-dinutuximab (∼7.4 kBq), quantitative ex vivo biodistribution was conducted at 4, 24, 72, and 168 h post-injection. Tissues were harvested, weighed, and radioactivity was measured via gamma counting of 213Bi emissions to estimate 225Ac decay products. (F) Radiochemical yields (n = 4) for each construct are summarized in a table format, as measured by iTLC. (G) Autoradiography of 90Y-, 177Lu-, and 225Ac-dinutuximab treated tumor sections. Cryosections were obtained at 20 µm thickness, exposed to phosphor screens, and imaged with an iQID scanner (QScint; Tucson, AZ, USA).

Purpose: This study aimed to compare QoL outcomes among patients undergoing active breathing control (ABC), voluntary deep inspiration breath hold (vDIBH), and surface-guided radiation therapy (SGRT). Methods: This was a non-randomized, three-arm clinical trial in which 55 patients were sequentially allocated to ABC (n = 19), SGRT (n = 20), or vDIBH (n = 16). QoL was assessed using the European Organization for Research and Treatment of Cancer QoL questionnaire (EORTC QLQ-C30) at baseline, treatment completion, and 6–8 weeks post-treatment. Linear regression was used to compare changed scales in QoL domains across groups. A p-value of <0.05 was considered statistically significant. Results: Baseline QoL scores were high across all groups, with physical functioning being the highest-rated domain and global health status the lowest. Fatigue, pain, and insomnia were the most highly reported symptoms at all time points. At 6–8 weeks, social functioning improved significantly in SGRT compared to vDIBH (16.67 vs. −12.50, p = 0.0053). Patients in the vDIBH group reported significantly increased pain compared to ABC at 6–8 weeks (p = 0.0240). No other significant differences were observed in QoL changes between the groups. Conclusions: The three breath-hold techniques maintained overall QoL with no differences between the groups, except for pain between vDIBH and ABC and social functioning for vDIBH and SGRT both at 6–8 weeks of follow-up. Despite the limitations of this study, each breath-hold technique has demonstrated comparable impact on QoL in patients with left-sided breast cancer and each could be used as a viable option with respect to QoL.

5 December 2025

Flow diagram of participants included in each breath-hold technique for the baseline, last fraction, and 6–8 weeks follow-up. Abbreviations: ABC = active breathing control, SGRT = surface-guided radiation therapy, vDIBH = voluntary deep inspiration breath-hold.

Introduction. This study aims to conduct a cost-effectiveness analysis comparing two primary treatment approaches: radical prostatectomy versus radiotherapy plus androgen deprivation therapy (ADT) in patients with Prostate Imaging Reporting and Data System (PI-RADS) 5 lesions. Patients and Methods. Data were extracted from two published retrospective cohort studies. Using survival data from two retrospective studies, we reconstructed Kaplan–Meier curves, overlaid them for comparative metasurvival analysis, and developed a cost-function model to assess economic implications alongside clinical outcomes. The primary outcomes included biochemical recurrence-free survival (FFBF) at 2 and 5 years; the area under the survival curve; total cost per treatment strategy; and cost per recurrence-free patient at 5 years. Results. At 5 years, the estimated FFBF was 83% for radiotherapy vs. 28% for prostatectomy. Radiotherapy yielded an AUC of 80.7, while prostatectomy showed 41.9. Radiotherapy yielded a cost of 21,211 € per FFBF patient compared to 113,730 € for prostatectomy. Conclusion. Our study demonstrates that radiotherapy combined with ADT, when selected based on mpMRI stratification, may represent a cost-efficient alternative, pending prospective validation. To radical prostatectomy in patients with PI-RADS 5 prostate cancer, with a favourable cost–benefit profile.

4 December 2025

Superimposed Kaplan–Meier Curves: PI-RADS 5.
  • Case Report
  • Open Access

Unilateral to Bilateral Lumbosacral Plexopathy After Radiation Therapy: A Case Report

  • Ezek Mathew,
  • Reyhan Meetheen and
  • Anand Shivnani
  • + 1 author

Radiation therapy (RT) has been one of the standard treatments for prostate cancer; however, its potential impact on nearby neural structures, such as the lumbosacral plexus (LSP), is often overlooked. The lack of contouring in treatment plans has led to unintended consequences. Radiation-induced lumbosacral plexopathy (RILSP) is a rare but serious complication that presents with progressive lower extremity sensory changes and weakness, mimicking radiculopathy. We report the case of a 66-year-old male who developed bilateral lower extremity neurological deficits post-pelvic radiation for prostate cancer. Radiographically, no compressive lesions were found, and the Electromyography (EMG) revealed involvement of nerves inconsistent with radiculopathy. This led to the diagnosis of RILSP. This case highlights the importance of recognition of RILSP in contrast to radiculopathy in patients with unexplained neurological symptoms after pelvic RT. This highlights the importance of incorporating the LSP as an organ at risk while planning for RT and reviewing retrospectively the dosimetry. It also emphasizes the need for improved contouring of LSP in radiation planning to minimize adverse effects. This sentiment is reflected in the literature, along with the consensus that more research is needed to address the true rate of RILSP.

28 November 2025

Patient’s self-described pain pattern upon initial presentation to the neurosurgery clinic.

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Advances in Musculoskeletal Imaging and Their Applications
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Advances in Musculoskeletal Imaging and Their Applications

Editors: Adam Piórkowski, Rafał Obuchowicz, Andrzej Urbanik, Michał Strzelecki

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Radiation - ISSN 2673-592X