Background: To compare two strategies of dynamic intensity modulated radiation therapy (dIMRT) with 3-dimensional conformal radiation therapy (3DCRT) in the setting of hypofractionated high-risk prostate cancer treatment.

Methods: 3DCRT and dIMRT/Helical Tomotherapy(HT) planning with 10 CT datasets was undertaken to deliver 68 Gy in 25 fractions (prostate) and simultaneously delivering 45 Gy in 25 fractions (pelvic lymph node targets) in a single phase. The paradigms of pelvic vessel targeting (iliac vessels with margin are used to target pelvic nodes) and conformal normal tissue avoidance (treated soft tissues of the pelvis while limiting dose to identified pelvic critical structures) were assessed compared to 3DCRT controls. Both dIMRT/HT and 3DCRT solutions were compared to each other using repeated measures ANOVA and post-hoc paired t-tests.

Results: When compared to conformal pelvic vessel targeting, conformal normal tissue avoidance delivered more homogenous PTV delivery (2/2 t-test comparisons; p < 0.001), similar nodal coverage (8/8 t-test comparisons; p = ns), higher and more homogenous pelvic tissue dose (6/6 t-test comparisons; p < 0.03), at the cost of slightly higher critical structure dose (Ddose, 1-3 Gy over 5/10 dose points; p < 0.03). The dIMRT/HT approaches were superior to 3DCRT in sparing organs at risk (22/24 t-test comparisons; p < 0.05).

Conclusion: dIMRT/HT nodal and pelvic targeting is superior to 3DCRT in dose delivery and critical structure sparing in the setting of hypofractionation for high-risk prostate cancer. The pelvic targeting paradigm is a potential solution to deliver highly conformal pelvic radiation treatment in the setting of nodal location uncertainty in prostate cancer and other pelvic malignancies.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2249591PMC
http://dx.doi.org/10.1186/1748-717X-3-1DOI Listing

Publication Analysis

Top Keywords

radiation therapy
16
prostate cancer
16
t-test comparisons
16
high-risk prostate
12
pelvic
10
strategies dynamic
8
dynamic intensity
8
intensity modulated
8
modulated radiation
8
therapy dimrt
8

Similar Publications

Cancer-associated fibroblast-derived exosomal FAM83F regulates KIF23 expression to promote the malignant progression and reduce radiosensitivity in non-small cell lung cancer.

Cytotechnology

April 2025

Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing Cancer Institute, Chongqing Cancer Hospital, Chongqing University Cancer Hospital, Chongqing, 400030 China.

Unlabelled: Cancer-associated fibroblasts (CAFs) have been shown to play a crucial role in the progression of non-small cell lung cancer (NSCLC). Exosomes derived from CAFs have emerged as important mediators of intercellular communication in the tumor microenvironment, contributing to cancer progression. Therefore, it is essential to further investigate the mechanisms by which CAF-derived exosomes regulate NSCLC.

View Article and Find Full Text PDF

Nanoparticle technology has revolutionized breast cancer treatment by offering innovative solutions addressing the gaps in traditional treatment methods. This paper aimed to comprehensively explore the historical journey and advancements of nanoparticles in breast cancer treatment, highlighting their transformative impact on modern medicine. The discussion traces the evolution of nanoparticle-based therapies from their early conceptualization to their current applications and future potential.

View Article and Find Full Text PDF

Objective: To evaluate the efficacy of supra-inguinal fascia iliaca compartment block (S-FICB) in patients undergoing proximal femoral nail antirotation (PFNA) internal fixation surgery for intertrochanteric fracture (ITF).

Methods: Retrospective analysis of 95 patients with ITF undergoing PFNA internal fixation surgery in the First People's Hospital of Yong Kang from March 2021 to August 2023 was performed. Among them, 49 patients received general anesthesia (GA; GA group) and 46 patients received S-FICB combined with general anesthesia (S-FICB group).

View Article and Find Full Text PDF

Cardiorespiratory-gated cardiac proton radiotherapy using a novel ultrasound guidance system.

Clin Transl Radiat Oncol

March 2025

Smilow Center for Translational Research, Room 8-136, Univ of Pennsylvania, Perelman School of Medicine, 3400 Civic Center Blvd, Bldg 421, Philadelphia, PA 19104, USA.

Cardiac stereotactic body radiotherapy is a promising noninvasive treatment for patients with refractory ventricular tachycardia. With the aim to prove feasibility of a novel image guided radiotherapy and heart motion gating device, cardiac proton radiotherapy was performed using a porcine model. Using a novel adaptation of γ - H2AX tissue staining techniques, we have been able to localize a radiation beam in large animal tissue to assess targeting accuracy within a defined field.

View Article and Find Full Text PDF

Aim: This study leveraged standard-of-care CT scans of patients receiving unilateral radiotherapy (RT) for early tonsillar cancer to detect volumetric changes in the carotid arteries, and determine whether there is a dose-response relationship.

Methods: Disease-free cancer survivors (>3 months since therapy and age > 18 years) treated with intensity modulated RT for early (T1-2, N0-2b) tonsillar cancer with pre- and post-therapy contrast-enhanced CT scans available were included. Patients treated with definitive surgery, bilateral RT, or additional RT before the post-RT CT scan were excluded.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!