Abstract
Purpose
To determine the impact of sparing submandibular glands (SMGs) on alleviating xerostomia and the functional dynamics of the irradiated parotid glands (PGs) and sublingual glands (SLGs) by diffusion-weighted imaging.
Methods
97 participants underwent 9 rounds of DWI scans before IC (pre-IC), pre-radiation (pre-RT), the midpoint of radiation (mid-RT), the end of radiation (post-RT), 1, 3, 6, 9, 12 (12m-RT) months following radiation. Apparent diffusion coefficient of SMGs (ADCSMG), PGs (ADCPG), and SLGs (ADCSLG), xerostomia questionnaire scores (XQ), and saliva flow rate measures under unstimulated (uSFR) and stimulated condition (sSFR) were documented.
Results
ADCPG, ADCSMG, ADCSLG, and XQ showed a rapid increase with a top at 3m-RT followed by regression, whereas uSFR and sSFR had the reverse trend. The change rate of ADC correlated with the dose to PGs, SMGs, and SLGs, as well as uSFR, sSFR, and XQ scores (p < 0.05 for all, except for uSFR with ADCPG (p = 0.063)). Maingroup for ADCPG, uSFR, and sSFR were significant (p values were 0.028, 0.000, 0.000 respectively); ADCPG in SMG sparing group was lower while uSFR, and sSFR were higher than those in the SMG-unsparing group. Simplegroup for ADCSMG, ADCSLG (all p < 0.05 from mid-RT to 12m-RT), and XQ (all p < 0.001 at mid-, 6m-, 9m-, and 12m-RT) were significant; ADCSMG, ADCSLG, and XQ were lower in the SMG-sparing group.
Conclusions
SMG protection has a great impact on the functional retention of PGs and SLGs, resulting in alleviating xerostomia and improving quality of life.
Trial registration
The clinical trial was also registered with the Chinese Clinical Study Registry (registered number: ChiCTR1900024328, Date: July 6, 2019; URL: https://www.chictr.org.cn/showproj.aspx?proj=40726)
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D. Zhao: design of the study, interpretation of data, the draft of work; W. Fan: design of the study, interpretation of data, the draft of work; H. Jiang: design of the study, interpretation of data, the draft of work; W. Yu: design of the study, interpretation of data, the draft of work; L. Ma: design of the study, interpretation of data, the draft of work; L. Meng: interpretation of data, the draft of work; B. Cai: interpretation of data, the draft of work; X. Zhang: interpretation of data, the draft of work; L. Zhao: interpretation of data, the draft of work.
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D. Zhao, W. Fan, H. Jiang, L. Meng, B. Cai, X. Zhang, W. Yu, L. Zhao and L. Ma declare that they have no competing interests.
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All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. This study (Clinical Trial Registry number: ChiCTR1900024328) was approved by the research ethics board of the Chinese PLA General Hospital. Informed consent was obtained from all individual participants included in the study.
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The authors Dawei Zhao, Wenjun Fan, and Huayong Jiang contributed equally to the manuscript.
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Zhao, D., Fan, W., Jiang, H. et al. The impact of submandibular glands protection on xerostomia as monitored by diffusion-weighted imaging in nasopharyngeal carcinoma patients. Strahlenther Onkol 200, 377–388 (2024). https://doi.org/10.1007/s00066-023-02167-6
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DOI: https://doi.org/10.1007/s00066-023-02167-6