Actively Recruiting
Adaptive Fractionation in Online Adaptive Stereotactic Radiotherapy for Abdominopelvic Lymph Node Oligometastases
Led by Joost J. M. E. Nuyttens · Updated on 2026-02-17
25
Participants Needed
1
Research Sites
148 weeks
Total Duration
On this page
AI-Summary
What this Trial Is About
Oligometastases, a state of cancer with up to five metastases, was traditionally treated with systemic treatments like chemotherapy. Treatment with stereotactic body radiotherapy (SBRT) showed a high local control and improved disease-free survival. The use of SBRT also allows for the deferral of systemic treatment, thereby delaying its potential side effects. SBRT enables the delivery of a high dose to the tumor while minimizing the dose to organs at risk, reducing normal tissue damage, however, toxicity remains a potential issue in the abdominopelvic region, where lymph node oligometastases are often located near highly mobile, radiosensitive organs like the bowel. Online adaptive radiotherapy is used to address this issue, adapting the treatment plan to the anatomy of the day. Unfortunately, adaptive radiotherapy results in longer treatment delivery times than conventional radiotherapy. This can potentially be countered by increasing the fraction dose and reducing the number of fractions if the patient anatomy allows it. This is convenient for the patient as it reduces the number of hospital visits, and it could also reduce the total workload for the hospital. Therefore, there is not only a benefit of a reduction in toxicity by adaptive treatment, but also in reducing the total treatment time. This study aims to investigate if the number of adaptive fractions can be reduced by 30% for patients with abdominal or pelvic lymph node oligometastases.
CONDITIONS
Official Title
Adaptive Fractionation in Online Adaptive Stereotactic Radiotherapy for Abdominopelvic Lymph Node Oligometastases
Who Can Participate
Eligibility Criteria
You may qualify if you...
Inclusion criteria:
- Patients with abdominal and/or pelvic lymph node recurrences of solid tumors.
- No more than 5 metastatic lesions in no more than 2 organs and a controlled primary tumor site.
- Diagnostic imaging includes at least a PET scan or CT thorax/abdomen, of which one is not older than 4 weeks at the time of referral for SBRT.
- Primary tumor must be treated at least 4 months before the diagnosis of metastasis.
- Patients must be 18 years or older.
- Written informed consent.
Exclusion criteria:
- Prior radiotherapy in the same field.
- Second primary malignancy except in situ carcinoma of the cervix, adequately treated non-melanoma skin cancer, or other malignancy treated at least 3 years.
- Serious concomitant systemic disorders that would compromise the safety of the patient or his/her ability to complete the study, at the discretion of the investigator.
You will not qualify if you...
History of severe allergic reactions to study medication Currently pregnant or breastfeeding Recent participation in another clinical trial within the last 30 days Presence of uncontrolled medical conditions that could affect safety
AI-Screening
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Trial Site Locations
Total: 1 location
1
Erasmus MC
Rotterdam, South Holland, Netherlands, 3015GD
Actively Recruiting
How is the study designed?
Study Type
INTERVENTIONAL
Masking
NONE
Allocation
NA
Model
SINGLE_GROUP
Primary Purpose
TREATMENT
Number of Arms
1
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