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Posted by on Mar 28, 2021 in Colorectal cancer | 0 comments

In a nutshell

This study investigated the effectiveness and safety of computed tomography (CT)-guided radioactive 125Iodine (RI) implantation in patients with recurrent locally advanced rectal cancer (LARC). Researchers suggested that CT-guided RI implantation is a good and safe treatment for patients with LARC that came back after previous treatment.

Some background

LARC that has been treated with surgery or radiotherapy commonly comes back at the same place after this first treatment. This is called local recurrence. Radiation therapy improves overall survival and progression in some of these patients. However, enough doses can hardly reach the recurrent tumor in the pelvis (the lower part of the abdomen) area. Moreover, standard radiation is associated with negative side effects.

CT-guided RI delivers a high dose of radiation without affecting the surrounding tissue. 125Iodine provides a slow and continuous release of radiation to damage the tumor. The effectiveness of CT-guided RI implantation in patients with high-risk recurrent LARC is still not clear.

Methods & findings

This study included information about 101 patients with LARC that came back after initial radiotherapy or surgery. All patients underwent RI implantation guided with CT imaging. The average follow-up time was 20.5 months.

Overall, 57.4% of patients responded to treatment. The average time cancer did not get worse was 10 months. The average overall survival was 20.8 months. 18.4% of patients had local control (the cancer did not worsen) at 5 years.

Side effects were observed in 13.9% of patients. Most of these were mild. 

The bottom line

This study concluded that CT-guided RI is a good and safe method for the treatment of LARC.

The fine print

It was difficult to indicate if the cause for side effects was Iodine-125, disease progression, or previous high-doses of radiation. Moreover, this study is based on the medical records of a small number of patients. Some information might have been incomplete which can affect the results.

Published By :

Frontiers in oncology

Date :

Feb 09, 2021

Original Title :

Long-Term Outcomes and Prognostic Analysis of Computed Tomography-Guided Radioactive 125I Seed Implantation for Locally Recurrent Rectal Cancer After External Beam Radiotherapy or Surgery.

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