Volume 124, Issue 12 pp. 2732-2738
Head and Neck

Interim FDG PET/CT for predicting the outcome in patients with head and neck cancer

Shang-Wen Chen MD

Shang-Wen Chen MD

Department of Radiation Oncology, China Medical University, Taichung

School of Medicine, China Medical University, Taichung

School of Medicine, Taipei Medical University, Taipei, Taiwan

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Te-Chun Hsieh MD

Te-Chun Hsieh MD

Department of Nuclear Medicine and PET Center, China Medical University, Taichung

Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung

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Kuo-Yang Yen BSc

Kuo-Yang Yen BSc

Department of Nuclear Medicine and PET Center, China Medical University, Taichung

Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung

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Shih-Neng Yang MD

Shih-Neng Yang MD

Department of Radiation Oncology, China Medical University, Taichung

Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung

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Yao-Ching Wang MD

Yao-Ching Wang MD

Department of Radiation Oncology, China Medical University, Taichung

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Chun-Ru Chien MD, PhD

Chun-Ru Chien MD, PhD

Department of Radiation Oncology, China Medical University, Taichung

School of Medicine, China Medical University, Taichung

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Ji-An Liang MD

Ji-An Liang MD

Department of Radiation Oncology, China Medical University, Taichung

School of Medicine, China Medical University, Taichung

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Chia-Hung Kao MD

Corresponding Author

Chia-Hung Kao MD

Department of Nuclear Medicine and PET Center, China Medical University, Taichung

School of Medicine, China Medical University, Taichung

Send correspondence to Chia-Hung Kao, MD, Department of Nuclear Medicine and PET Center, China Medical University Hospital, No 2. Yur-Der Road, Taichung 404, Taiwan. E-mail: [email protected]Search for more papers by this author
First published: 10 July 2014
Citations: 37

Financial Disclosure: Grant support (CMU98-C-13) of China Medical University; and Health and welfare surcharge of tobacco products, China Medical University Hospital Cancer Research Center of Excellence (MOHW103-TD-B-111-03, Taiwan). The authors have no other funding, financial relationships, or conflicts of interest to disclose.

Abstract

Objectives/Hypothesis

The study aimed to investigate the prognostic effects of interim 18fluoro-2-deoxy-D-glucose positron emission tomography/computed tomography (PET/CT) during definitive radiotherapy (RT) or chemoradiotherapy (CRT) in patients with head and neck cancer.

Study Design

This is a prospectively treatment study.

Methods

The pretreatment and interim PET/CT images of 51 patients with advanced pharyngeal cancers receiving definitive RT/CRT were evaluated prospectively. The interim PET/CT images were taken at a cumulative RT dose ranging from 41.4 to 46.8 Gy. The maximum standardized uptake value (SUVm) of the interim PET/CT and the reduction ratio of the SUVm (SRR) between the two images were measured. The differences between patients with or without local failures were examined using the Mann-Whitney test. Overall survival (OS), disease-free survival (DFS), and primary and nodal relapse-free survival rates were calculated using the Kaplan-Meier method. Independent prognosticators were identified using Cox regression analysis.

Results

After a median follow-up duration of 23 months, a higher interim SUVm was associated with local failures. Conducting a multivariate analysis revealed that a SUVmax reduction ratio of primary tumor (SRR-P) < 0.64 was associated with the inferior OS (hazard ratio 2.64; P =0.035) and DFS (hazard ratio 2.33; P = 0.045). Patients who had tumors with an SRR-P < 0.64 had a considerably lower 2-year OS and DFS compared with those who had SRR-P ≥ 0.64 (47% vs. 66%; 41% vs. 64%).

Conclusion

A higher interim SUVm was associated with local recurrence. In addition, patients with a lower SRR-P should be considered to be at risk of primary failure.

Level of Evidence

4. Laryngoscope, 124:2732–2738, 2014

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