Abstract
Purpose
To determine if treatment of nasopharyngeal carcinoma (NPC) induces early changes in amide proton transfer-weighted (APTw) magnetic resonance imaging (MRI), and to perform a preliminary evaluation of APTw imaging in response assessment.
Methods
Sixteen patients with NPC planned for treatment with radiotherapy and/or chemotherapy underwent APTw imaging of the primary tumour pre-treatment and 2-week intra-treatment. Difference in pre- and intra-treatment APT mean (APTmean) was compared using the Wilcoxon signed rank test. Differences in APTmean and percentage change (%Δ) in APTmean were compared between responders and non-responders based on the outcome at 6 months, using the Mann–Whitney U test.
Results
APTmean decreased in 9/16 (56.3%) and increased in 7/16 (43.7%) with no significant difference between the pre- and intra-treatment APT values for the whole group (p > 0.05). NPC showed response in 11/16 (68.8%) and non-response in 5/11 (31.2%). There were significant differences between the %Δ of responders and non-responders for APTmean (p = 0.01). Responders showed %Δ decrease in APTmean of − 23.12% while non-responders showed a %Δ increase in APTmean of + 102.28%.
Conclusion
APT value changes can be detected in early intra-treatment. Intra-treatment %Δ APTmean shows potential in predicting short-term outcome.
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Acknowledgements
The authors thank Dr Jinyuan Zhou, Department of Radiology, Johns Hopkins University, for providing technical advice on pulse sequencing.
Funding
The work described in this paper was supported by grants from the Research Grants council of the Hong Kong Special Administrative Region, China (Project no. CUHK141070/14 and SEG_CUHK02).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standard.
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Qamar, S., King, A.D., Ai, QY. et al. Amide proton transfer MRI detects early changes in nasopharyngeal carcinoma: providing a potential imaging marker for treatment response. Eur Arch Otorhinolaryngol 276, 505–512 (2019). https://doi.org/10.1007/s00405-018-5231-x
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DOI: https://doi.org/10.1007/s00405-018-5231-x