The Physical Dosimetry Study and Preliminary Clinical Results of 3D-printing Non Co-planar Template Assisted With CT-guidance for Iodine-125 Seed Brachytherapy in Pelvic Recurrent Rectum Carcinoma After Surgery and External Beam Radiotherapy

Peking University

Status: Completed

Conditions: Rectum Cancer, Recurrent; Brachytherapy, Radioisotope

Treatments: Radiation: radioactive Iodine-125 seed implantation under the guidance of 3D template

Study type: Observational

Funder types: Other

Identifiers

NCT03890926

PekingUTH RT

Details and patient eligibility

About

This study observes the efficacy and side effects of 3D-printing non co-planar template(3D-PNCT) assisted with CT-guidance for radioactive Iodine-125 seed(RIS) brachytherapy in pelvic recurrent rectum carcinoma retrospectively, and analyzes the influence of clinical and dosimetric factors on the outcomes.

Full description

3D-PNCT assisted with CT-guidance for radioactive Iodine-125 seed brachytherapy is a conventional treatment in Peking University Third Hospital. Radioactive Iodine-125 seed brachytherapy is the implantation of Iodine-125 seed into tumors.The radioactive Iodine-125 seed can release low dose of irradiation persistently which kills tumors cell and causes less damage to normal tissue at the same time. 3D-printing non co-planar template is made individually which guides the implantation of Iodine-125 seed into the tumor and ensures the accuracy of the position.This study collects the data of patients with pelvic recurrent rectal carcinoma who underwent 3D-PNCT assisted with CT-guidance for radioactive Iodine-125 seed implantation from 2015 to 2018. We evaluate the dose that covers 90% target volume(D90),the volume that 100% prescription dose covers(V100) and other dosimetric parameters after the implantation. The efficacy and adverse effects were observed. Local control(LC) time and overall survival(OS) time are evaluated.

Enrollment: 66 patients

Sex: All

Ages: 18 to 80 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• treated with 3D-printing non co-planar template assisted with CT-guidance for Iodine-125 seed brachytherapy in Peking University Third Hospital
• histological proven recurrent rectal cancer
• inoperable local recurrent cases
• previous external beam radiotherapy, incapable of re-irradiation
• expected life span>3 months

Exclusion criteria

• serious medical illness
• unable to tolerate anesthesia
• blood coagulation dysfunction

Trial design

66 participants in 1 patient group

radioactive Iodine-125 seed implantation

Description:

All enrolled patients received the intervention previously as a conventional treatment.

Treatment:

Radiation: radioactive Iodine-125 seed implantation under the guidance of 3D template