Research on the Optimization of Treatment for Spinal Metastases With Radioactive Particle Implantation Using TPS and Mechanical Dual Simulation

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

NA

Total Enrollment

150 participants

Study Classification

INTERVENTIONAL

Study Start Date

2025-07-01

Study Completion Date

2027-06-01

Brief Summary

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This prospective, open-label randomized trial evaluates a dual-simulation planning strategy that combines standard brachytherapy TPS with patient-specific biomechanical modeling for radioactive seed implantation in bone metastases. The approach aims to improve dose coverage while accounting for fracture risk, needle path stability, and seed migration. Eligible patients with painful and/or progressive bone metastases are randomized to dual-simulation planning versus conventional TPS. All undergo image-guided implantation with post-implant dosimetric verification and standardized follow-up. The primary endpoint is 3-month pain response (BPI/VAS, adjusted for analgesic use). Secondary endpoints include dosimetry (D90, V100, CI, HI), local control/progression, seed migration, skeletal-related events and fractures, SINS and functional status, quality of life, procedure-related complications (CTCAE v5.0), and procedure metrics. We hypothesize the dual-simulation strategy will enhance dosimetric quality and reduce biomechanics-related complications, improving pain and function.

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Detailed Description

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This study aims to evaluate a "dual-simulation" optimization strategy that combines a brachytherapy treatment planning system (TPS) with biomechanical modeling to improve the feasibility, safety, and effectiveness of radioactive seed implantation for bone metastases (palliative/local control). Conventional TPS is primarily dose-centric and may not adequately account for the mechanical stability of metastatic bone lesions, feasibility of needle trajectories, or risk of seed migration, potentially leading to suboptimal dose distribution or increased post-procedural biomechanics-related adverse events. To address this gap, we integrate a patient-specific finite element biomechanical model into standard TPS to predict load-bearing behavior, fracture risk, needle path stability, and seed migration risk, enabling iterative, dose-mechanics constrained plan optimization.

This is a prospective, open-label, randomized controlled trial comparing "TPS + biomechanical dual-simulation" versus conventional TPS. Eligible participants are patients with bone metastases who meet indications for radioactive seed implantation and have pain and/or risk of local progression. In the experimental arm, preoperative imaging segmentation and individualized biomechanical modeling inform coupled optimization of needle trajectories and seed distributions; the control arm receives standard TPS-based planning. All patients undergo image-guided implantation, with post-implant dosimetric verification and standardized follow-up.

The primary endpoint is pain response at 3 months (per BPI or VAS, accounting for changes in analgesic use). Secondary endpoints include dosimetric parameters (e.g., D90, V100, conformity index \[CI\], homogeneity index \[HI\]), local control rate and time to progression, seed migration incidence, skeletal-related events (SREs) and pathologic fracture incidence/time, changes in SINS score and functional status (e.g., ECOG, TESS), quality of life (EORTC QLQ-C30), procedure-related complications (CTCAE v5.0), and procedure time/number of needle adjustments. Safety will be assessed at prespecified time points. Imaging will be performed at baseline, post-procedure, and during follow-up, with standardized post-implant dosimetric verification.

We hypothesize that the dual-simulation strategy will maintain or improve dose coverage and conformity while reducing seed migration and biomechanics-related complications, thereby improving pain relief and functional outcomes, and providing a more comprehensive, individualized optimization pathway for radioactive seed implantation in bone metastases.

Conditions

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Bone Metastases in Subjects With Advanced Cancer

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Two-arm, randomized, open-label trial comparing dual-simulation planning (TPS + patient-specific biomechanical FE model) versus conventional TPS for image-guided radioactive seed implantation in bone metastases.

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Masking: None (Open Label). Due to the procedural nature of seed implantation, participants and treating clinicians cannot be blinded. To reduce bias, key outcomes are assessed under blinded procedures: (1) centralized, de-identified imaging and dosimetry review by independent radiologists/physicists blinded to allocation; (2) pain and QoL collected via standardized instruments by staff not involved in planning, with pre-specified analgesic adjustment rules; (3) an independent endpoint adjudication committee and the statistical analysis team remain blinded to group assignment, using Arm A/B codes. Allocation is concealed until plan finalization; intraoperative teams are unblinded. Participants are instructed not to disclose perceived assignment to assessors.

Study Groups

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Experimental - TPS + Biomechanical Dual-Simulation

Single-group assignment using the dual-simulation planning workflow integrating TPS with patient-specific finite element modeling to optimize dose distribution and mechanical safety (fracture risk, needle stability, seed migration). Image-guided implantation is performed per optimized plan; postoperative CT provides dosimetric verification. Outcomes include pain response, dosimetry, biomechanics-related events, and safety.

Group Type EXPERIMENTAL

Dual-Simulation TPS + Biomechanical Planning

Intervention Type OTHER

Combines TG-43-based TPS with a patient-specific FE biomechanical model to optimize needle paths and seed placement considering OAR limits, fracture risk, needle stability, and seed migration risk.

Active Comparator - Conventional TPS

Preoperative planning using conventional TPS per institutional standards to meet dosimetric goals and OAR constraints; no biomechanical modeling. Image-guided implantation per plan; postoperative CT for seed localization and dosimetric verification. Follow-up schedule identical to the

Group Type ACTIVE_COMPARATOR

Conventional TPS Planning

Intervention Type OTHER

Conventional TPS-driven plan per institutional practice; no biomechanical modeling.

Interventions

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Dual-Simulation TPS + Biomechanical Planning

Combines TG-43-based TPS with a patient-specific FE biomechanical model to optimize needle paths and seed placement considering OAR limits, fracture risk, needle stability, and seed migration risk.

Intervention Type OTHER

Conventional TPS Planning

Conventional TPS-driven plan per institutional practice; no biomechanical modeling.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Age ≥18 years.

Radiologically or histologically confirmed bone metastasis with a lesion suitable for percutaneous radioactive seed implantation (e.g., I-125), per multidisciplinary assessment.

Indication for local palliation/control: moderate-to-severe pain at lesion (e.g., BPI/VAS ≥4) and/or imaging evidence of progression or high-risk features warranting local therapy.

Measurable/evaluable target lesion on CT/MRI; target location accessible for needle placement per institutional practice.

ECOG performance status 0-2.

Estimated life expectancy ≥3 months.

Adequate hemostasis: platelets ≥80×10\^9/L, INR ≤1.5 (or per protocol), and able to hold/bridge anticoagulation as clinically indicated.

Adequate organ function to undergo the procedure and anesthesia/sedation per site standards.

Able to undergo required imaging (CT; MRI if applicable).

Willing and able to provide written informed consent and comply with follow-up.

For women of childbearing potential and men with partners of childbearing potential: agreement to use effective contraception during and for the protocol-defined period after implantation.

Exclusion Criteria

* Need for urgent surgical decompression or stabilization (e.g., acute/impending neurologic compromise, unstable pathologic fracture) that precludes percutaneous implantation at this time.

Uncorrected coagulopathy or ongoing antithrombotic therapy that cannot be safely managed periprocedurally.

Active systemic or local infection at/near the planned access route.

Diffuse marrow replacement or extensive cortical destruction where percutaneous implantation is unsafe or unlikely to achieve local control without stabilization, per MDT judgment.

Prior radiation or surgery to the index lesion that, in the investigator's opinion, makes additional seed implantation unsafe or non-beneficial; postoperative bed without a discrete target for seed placement.

Known hypersensitivity to materials/agents required for the procedure (e.g., contrast) not amenable to premedication or alternative imaging.

Uncontrolled medical conditions posing prohibitive procedural risk (e.g., severe cardiopulmonary disease, uncontrolled hypertension/arrhythmia).

Pregnant or breastfeeding.

Inability to lie still or contraindications to required imaging/sedation not correctable.

Concurrent participation in another interventional study that could confound efficacy/safety assessment at the treated site.

Any condition that, in the investigator's judgment, would interfere with protocol adherence, safety monitoring, or outcome assessment.

Minimum Eligible Age

18 Years

Maximum Eligible Age

55 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No