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A Feasibility Study of Spacer Placement to Avoid the Bowel Radiation Exposure in Carbon Ion Radiotherapy for the Treatment of Retroperitoneal/Pelvic Tumors

A Feasibility Study of Spacer Placement to Avoid the Bowel Radiation Exposure in Carbon Ion Radiotherapy for the Treatment of Retroperitoneal/Pelvic Tumors - A Feasibility Study of Spacer Placement in Carbon Ion Radiotherapy for the Retroperitoneal/Pelvic Tumors

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
JPRN
Registry ID
JPRN-UMIN000013477
Enrollment
15
Registered
2014-03-24
Start date
2014-03-25
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

retroperitoneal/pelvic malignancy

Interventions

To keep the bowel away from the radiation field, the adipose tissue in the abdominal cavity or superimposed Gore-Tex sheets will be placed onto the tumor as a spacer.

Sponsors

Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1. Malignant tumor proven histologically or diagnosed by imaging modalities. 2. Tumor in the retroperitoneum or pelvis. 3. Unresectable tumor or the patient denies surgical removal. 4. Tumor contiguous with the bowel less than 5mm in distance. 5. No unmanageable distant metastases. 6. ECOG PS 0-2. 7. Age 20-75. 8. Adequate organ function to perform the surgery. 9. Over three months of apparent survival. 10. Written informed consent.

Exclusion criteria

Exclusion criteria: 1. Tumor with over 15cm in the maximum diameter. 2. Without indication for carbon ion radiotherapy. 3. Infectious disease in abdominal or pelvic cavity. 4. Serious co-morbidity, such as cardiopulmonary disease, bleeding tendency, uncontrollable diabetes mellitus or hypertension. 5. Pregnant or possibly pregnant women. 6. Other conditions judged ineligible by physician.

Design outcomes

Primary

MeasureTime frame
Intraoperative and postoperative morbidity rate

Secondary

MeasureTime frame
Treatment rate of carbon ion radiotherapy, Spacer placement rate, Operative time, Blood loss, Three year local control rate, Three year overall survival rate

Countries

Japan

Contacts

Public ContactTatsuya Manabe,MD

Graduate School of Medical Sciences, Kyushu University Surgery and Oncology

manabe@surg1.med.kyushu-u.ac.jp092-642-5440

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026