# Radiotherapy Response Patterns in Thoracic NUT Carcinoma: A Case Report

## TL;DR

A young woman with aggressive thoracic NUT carcinoma showed different responses to radiotherapy in different metastatic sites, highlighting challenges in managing this rare cancer.

## Contribution

This case report provides insights into the variable effectiveness of palliative radiotherapy in thoracic NUT carcinoma across different metastatic locations.

## Key findings

- A thoracic lesion showed sustained improvement after radiotherapy, while a pelvic metastasis progressed shortly after treatment.
- Single-fraction radiotherapy provided limited durability for bone metastasis-related pain.
- Emergent radiotherapy was needed for superior vena cava syndrome before a definitive diagnosis.

## Abstract

NUT carcinoma is a rare and highly aggressive malignancy, particularly when arising in the thorax. Radiotherapy is commonly used for symptom palliation; however, radiotherapeutic response patterns in thoracic NUT carcinoma remain poorly characterised. We report a 22‐year‐old woman with thoracic NUT carcinoma who demonstrated markedly heterogeneous responses to palliative radiotherapy across metastatic sites. A thoracic lesion causing superior vena cava (SVC) syndrome showed sustained radiographic improvement after irradiation, whereas a pelvic bone metastasis progressed shortly after single‐fraction radiotherapy despite transient symptom relief. Although differences in delivered radiation dose likely contributed to these outcomes, this case illustrates practical considerations in palliative radiotherapy for thoracic NUT carcinoma, including effective symptom control for SVC syndrome and the limited durability of single‐fraction radiotherapy for bone metastases. This case highlights practical considerations in palliative radiotherapy for thoracic NUT carcinoma and provides an educational perspective for respiratory physicians involved in multidisciplinary cancer care.

We report a young woman with thoracic NUT carcinoma who experienced differential clinical responses to palliative radiotherapy across metastatic sites during the same clinical course. Rather than establishing intrinsic differences in radiosensitivity, this case illustrates real‐world clinical challenges in the management of advanced thoracic NUT carcinoma, including the need for emergent radiotherapy for superior vena cava syndrome prior to definitive diagnosis and the limited durability of single‐fraction radiotherapy for bone metastasis–related pain.