The Protection of Thyroid Function in IMRT for Nasopharyngeal Carcinoma

Status Recruiting

Clinical Trial Summary

This study aimed to reduce radiation-induced thyroid injury without compromising control of the cervical region by optimizing the delineation of the cervical lymph node drainage area.

Clinical Trial Description

Since the neck target area of nasopharyngeal carcinoma is close to the thyroid gland, the average dose to the thyroid gland is usually around 54Gy, which is difficult to meet the protection requirements for thyroid protection. In the current guidelines, the inner edge of the common carotid artery is used as the inner boundary of the lymph nodes in levels III and IVa, and the lymphatic drainage area needs to include the inner edge of the common carotid artery. Several studies have found that the centers of positive lymph nodes in cervical regions III and IVa are located outside the inner border of the common carotid artery. In order to better protect the thyroid gland, the investigators have improved the delineation of the neck target area. For patients with negative lymph nodes in regions II and IVa (accounting for about 60% of the total patients), a modified neck target volume delineation method was used to define the inner boundary of regions III and IVa as the outer edge of the common carotid artery. For patients with positive lymph nodes in regions III and IVa (accounting for about 40% of the total patients), the inner boundary of regions III and IVa is defined as the inner edge of the common carotid artery or the outer edge of the thyroid. This study aimed to reduce radiation-induced thyroid injury without compromising control of the cervical region by optimizing the delineation of the cervical lymph node drainage area. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT06268600
Study type	Interventional
Source	Jiangxi Provincial Cancer Hospital
Contact
Status	Recruiting
Phase	N/A
Start date	January 1, 2019
Completion date	November 30, 2025

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