Factors influencing the parotid function in nasopharyngeal carcinoma treated with parotid-sparing radiotherapy

Wen Shan Liu, Steve Pai Hsun Lee, Jong Kang Lee, Mao Chang Su, Gin Den Chen, Hong Shen Lee, Huei Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background: To evaluate the factors influencing post-irradiation parotid gland function in nasopharyngeal cancer treated with parotid-sparing radiotherapy. Methods: This study consisted of 45 patients with nasopharyngeal cancer treated with radiotherapy including 3D conformal radiotherapy, intensity-modulated radiotherapy and high-dose-rate brachytherapy. The mean follow-up time was 37.5 months (range: 15-50 months). Objective parotid gland function was assessed by series sialoscintigraphy pre-irradiation and post-irradiation at 1, 6, 12 and 18 months. Subjective salivary function was recorded by the LENT/SOMA system. Wilcoxon signed-rank test was used to compare the secretion ratio (SR) of parotid gland before and after treatment. Mann-Whitney rank-sum test was used to determine the factors influencing the post-irradiated SR. Chi-square test was used to compare the correlation between subjective grading of xerostomia and objective grading of parotid glands. Results: There was a significant difference between the pre-irradiation and post-irradiation parotid gland's SR at 1 (0.30 versus 0.01, P <0.05) and 6 months (0.03 versus 0.08, P <0.05). However, there was no significant difference compared with the pre-irradiation SR at 12 (0.30 versus 0.20, P > 0.05) and 18 months (0.30 versus 0.18, P > 0.05). There was significant correlation between subjective and objective salivary function (P = 0.024) at 12 months after radiotherapy. The factor that impacted the preservation of parotid function was mean dose to the parotid gland >38.0 Gy (P <0.05). Conclusions: Our results demonstrated that parotid function could recover 1 year after treatment with parotid-sparing radiotherapy in patients with nasopharyngeal cancer. The most important factor that influenced parotid function was the mean dose to the parotid gland.

Original languageEnglish
Pages (from-to)626-631
Number of pages6
JournalJapanese Journal of Clinical Oncology
Volume36
Issue number10
DOIs
Publication statusPublished - Oct 2006
Externally publishedYes

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Parotid Gland
Radiotherapy
Nasopharyngeal Neoplasms
Nonparametric Statistics
Conformal Radiotherapy
Xerostomia
Intensity-Modulated Radiotherapy
Brachytherapy
Chi-Square Distribution
Nasopharyngeal carcinoma
Therapeutics

Keywords

  • Intensity-modulated radiotherapy
  • Nasopharyngeal carcinoma
  • Parotid-sparing radiotherapy
  • Sialoscintigraphy
  • Xerostomia

ASJC Scopus subject areas

  • Oncology

Cite this

Factors influencing the parotid function in nasopharyngeal carcinoma treated with parotid-sparing radiotherapy. / Liu, Wen Shan; Lee, Steve Pai Hsun; Lee, Jong Kang; Su, Mao Chang; Chen, Gin Den; Lee, Hong Shen; Lee, Huei.

In: Japanese Journal of Clinical Oncology, Vol. 36, No. 10, 10.2006, p. 626-631.

Research output: Contribution to journalArticle

Liu, Wen Shan ; Lee, Steve Pai Hsun ; Lee, Jong Kang ; Su, Mao Chang ; Chen, Gin Den ; Lee, Hong Shen ; Lee, Huei. / Factors influencing the parotid function in nasopharyngeal carcinoma treated with parotid-sparing radiotherapy. In: Japanese Journal of Clinical Oncology. 2006 ; Vol. 36, No. 10. pp. 626-631.
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abstract = "Background: To evaluate the factors influencing post-irradiation parotid gland function in nasopharyngeal cancer treated with parotid-sparing radiotherapy. Methods: This study consisted of 45 patients with nasopharyngeal cancer treated with radiotherapy including 3D conformal radiotherapy, intensity-modulated radiotherapy and high-dose-rate brachytherapy. The mean follow-up time was 37.5 months (range: 15-50 months). Objective parotid gland function was assessed by series sialoscintigraphy pre-irradiation and post-irradiation at 1, 6, 12 and 18 months. Subjective salivary function was recorded by the LENT/SOMA system. Wilcoxon signed-rank test was used to compare the secretion ratio (SR) of parotid gland before and after treatment. Mann-Whitney rank-sum test was used to determine the factors influencing the post-irradiated SR. Chi-square test was used to compare the correlation between subjective grading of xerostomia and objective grading of parotid glands. Results: There was a significant difference between the pre-irradiation and post-irradiation parotid gland's SR at 1 (0.30 versus 0.01, P <0.05) and 6 months (0.03 versus 0.08, P <0.05). However, there was no significant difference compared with the pre-irradiation SR at 12 (0.30 versus 0.20, P > 0.05) and 18 months (0.30 versus 0.18, P > 0.05). There was significant correlation between subjective and objective salivary function (P = 0.024) at 12 months after radiotherapy. The factor that impacted the preservation of parotid function was mean dose to the parotid gland >38.0 Gy (P <0.05). Conclusions: Our results demonstrated that parotid function could recover 1 year after treatment with parotid-sparing radiotherapy in patients with nasopharyngeal cancer. The most important factor that influenced parotid function was the mean dose to the parotid gland.",
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AU - Su, Mao Chang

AU - Chen, Gin Den

AU - Lee, Hong Shen

AU - Lee, Huei

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N2 - Background: To evaluate the factors influencing post-irradiation parotid gland function in nasopharyngeal cancer treated with parotid-sparing radiotherapy. Methods: This study consisted of 45 patients with nasopharyngeal cancer treated with radiotherapy including 3D conformal radiotherapy, intensity-modulated radiotherapy and high-dose-rate brachytherapy. The mean follow-up time was 37.5 months (range: 15-50 months). Objective parotid gland function was assessed by series sialoscintigraphy pre-irradiation and post-irradiation at 1, 6, 12 and 18 months. Subjective salivary function was recorded by the LENT/SOMA system. Wilcoxon signed-rank test was used to compare the secretion ratio (SR) of parotid gland before and after treatment. Mann-Whitney rank-sum test was used to determine the factors influencing the post-irradiated SR. Chi-square test was used to compare the correlation between subjective grading of xerostomia and objective grading of parotid glands. Results: There was a significant difference between the pre-irradiation and post-irradiation parotid gland's SR at 1 (0.30 versus 0.01, P <0.05) and 6 months (0.03 versus 0.08, P <0.05). However, there was no significant difference compared with the pre-irradiation SR at 12 (0.30 versus 0.20, P > 0.05) and 18 months (0.30 versus 0.18, P > 0.05). There was significant correlation between subjective and objective salivary function (P = 0.024) at 12 months after radiotherapy. The factor that impacted the preservation of parotid function was mean dose to the parotid gland >38.0 Gy (P <0.05). Conclusions: Our results demonstrated that parotid function could recover 1 year after treatment with parotid-sparing radiotherapy in patients with nasopharyngeal cancer. The most important factor that influenced parotid function was the mean dose to the parotid gland.

AB - Background: To evaluate the factors influencing post-irradiation parotid gland function in nasopharyngeal cancer treated with parotid-sparing radiotherapy. Methods: This study consisted of 45 patients with nasopharyngeal cancer treated with radiotherapy including 3D conformal radiotherapy, intensity-modulated radiotherapy and high-dose-rate brachytherapy. The mean follow-up time was 37.5 months (range: 15-50 months). Objective parotid gland function was assessed by series sialoscintigraphy pre-irradiation and post-irradiation at 1, 6, 12 and 18 months. Subjective salivary function was recorded by the LENT/SOMA system. Wilcoxon signed-rank test was used to compare the secretion ratio (SR) of parotid gland before and after treatment. Mann-Whitney rank-sum test was used to determine the factors influencing the post-irradiated SR. Chi-square test was used to compare the correlation between subjective grading of xerostomia and objective grading of parotid glands. Results: There was a significant difference between the pre-irradiation and post-irradiation parotid gland's SR at 1 (0.30 versus 0.01, P <0.05) and 6 months (0.03 versus 0.08, P <0.05). However, there was no significant difference compared with the pre-irradiation SR at 12 (0.30 versus 0.20, P > 0.05) and 18 months (0.30 versus 0.18, P > 0.05). There was significant correlation between subjective and objective salivary function (P = 0.024) at 12 months after radiotherapy. The factor that impacted the preservation of parotid function was mean dose to the parotid gland >38.0 Gy (P <0.05). Conclusions: Our results demonstrated that parotid function could recover 1 year after treatment with parotid-sparing radiotherapy in patients with nasopharyngeal cancer. The most important factor that influenced parotid function was the mean dose to the parotid gland.

KW - Intensity-modulated radiotherapy

KW - Nasopharyngeal carcinoma

KW - Parotid-sparing radiotherapy

KW - Sialoscintigraphy

KW - Xerostomia

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