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CTV is expanded by 3mm on the basis of GTV.

CTV is expanded by 6mm on the basis of GTV.

According to the clinical conditions of the patients, they will be assigned to two groups based on the doctor's recommendations and their own wishes

Xuemin Li, Dr

This study is to explore the progression-free survival time (PFS) , overall survival time (OS), quality of life and side effects between two different clinical target volumes in the treatment of 3D printing template-assisted CT-guided radioactive iodine-125 seeds implantation for recurrent rectal cancer after surgery and radiotherapy and investigate the clinical and dosimetric prognosis factors for outcomes.

From June 2019 to December 2020 in each participating center, patients with recurrent rectal cancer after surgery and radiotherapy will be included in the study if they meet the inclusion criteria and do not meet the exclusion criteria. According to the clinical conditions of the patients, they will be assigned to groups A or B according to the doctor's recommendations and their own wishes. GTV of both groups are visible tumors. The CTV of group A is expanded by 3mm on the basis of GTV, and the CTV of group B is expanded by 6mm. Both groups A and B received prescription dose: 95% GTV (120-160) Gy, 95% CTV (90-120) Gy. The activities of 125I seeds will be 0.4mCi-0.7mCi. All patients will receive 3D printed template-assisted 125I seeds implantation and be followed up. The differences in local progression-free survival time, overall survival time, change of quality of life, and side effects between different groups will be prospectively analyzed.

CTV Exploration of 3D-PT Assisted CT-guided I-125 Seeds Implantation for Recurrent Rectal Cancer

Clinical Target Volume Exploration of 3D Printing Personalized Template Assisted CT-guided Radioactive Iodine-125 Seeds Implantation as a Salvage Treatment for Recurrent Rectal Cancer Patients After Operation and Radiotherapy

This is a functional status score, which is one of the methods to evaluate the quality of life. The range is from 0-100 points. The higher the score, the better the functional status and the higher the quality of life are.

This is a pain score ,which is one of the evaluation indicators of quality of life. The range is 0-10 points. The higher the score, the higher the pain and the worse the quality of life are.

The time from 125I radioactive seeds implantation to local failure or death.

The time from 125I radioactive seeds implantation to death due to any cause.

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization	Link
CTV Exploration of 3D-PT Assisted CT-guided I-125 Seeds Implantation for Recurrent Rectal Cancer	NCT04710589	Recurrent Recta... 125I Seeds Impl... Clinical Target...	CTV	18 Years - 80 Years	Peking University Third Hospital
CTV Exploration of 3D-PT Assisted CT-guided I-125 Seeds Implantation for Recurrent Rectal Cancer	NCT04710589	Recurrent Recta... 125I Seeds Impl... Clinical Target...	CTV	18 Years - 80 Years	Peking University Third Hospital

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