Radiation Oncology Journal

The Korean Society for Radiation Oncology (대한방사선종양학회)
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Evaluation of Xerostomia Following Intensity Modulated Radiotherapy (IMRT) for Head and Neck Cancer Patients

세기조절방사선치료를 시행받은 두경부암 환자군에서 구강건조증지표 분석

  • Lee, Seok-Ho (Research Institute and Hospital, National Cancer Center) ;
  • Kim, Tae-Hyun (Research Institute and Hospital, National Cancer Center) ;
  • Chie, Eui-Kyu (Research Institute and Hospital, National Cancer Center) ;
  • Im, Hyun-Shun (Research Institute and Hospital, National Cancer Center) ;
  • Im, En-Shil (Research Institute and Hospital, National Cancer Center) ;
  • Ryu, Jun-Sun (Research Institute and Hospital, National Cancer Center) ;
  • Jung, Yoo-Seok (Research Institute and Hospital, National Cancer Center) ;
  • Park, Sung-Yong (Research Institute and Hospital, National Cancer Center) ;
  • Kim, Joo-Young (Research Institute and Hospital, National Cancer Center) ;
  • Pyo, Hong-Ryull (Research Institute and Hospital, National Cancer Center) ;
  • Shin, Kyung-Hwan (Research Institute and Hospital, National Cancer Center) ;
  • Kim, Dae-Yong (Research Institute and Hospital, National Cancer Center) ;
  • Cho, Kwan-Ho (Research Institute and Hospital, National Cancer Center)
  • Published : 2004.06.01
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Abstract

Purpose : This study was done to evaluate xerostomia fellowing intensity modulated radiotherapy for patients with head and neck cancer, and to analyze the correlation between the dosimetric parameters and xerostomia parameters. Materials and Methods : From February till October 2003, 13 patients with 3 months of follow-up were evaluated for xerostomia after being treated for head and neck cancer with IMRT. Their median age was 57 years(range: 43$\~$77). Xerostomia were assessed with a 4-question xerostomia questionnaire score (XQS) and a test for salivary flow rates (unstimulated and stimulated). The patients were also given a validated LENT SOMA scale (LSC) questionnaire. The evaluations were completed before radiation therapy (pre-RT) and at 1 and, 3 months after radiation therapy (RT). We evaluated xerostomia at pre-RT, 1 and, 3 months after RT. The association between the xerostomia parameters (XQS and LSC) and salivary flow rates (unstimulated and stimulated: USFR and SSFR) was assessed at 1 and 3 months after RT. Resrlts : All 13 patients showed no significant changes in XQS, LSC and Salivary Flow rates. As a result, we couldn't find out about xerostomia development. Based on the total mean parotid dose, 3,500 cGy, we divided these patients into two groups. The 8 patients (<3,500 cGy) showed no significant changes in XQS, LSC and Salivary Flow rates However, in 5 Patients ($\geq$3,500 cOGy), there was a significant increase in USFR and, SSFR at 3 months after RT, and for the XQS and, LSC at 1 and 3 months after RT. The correlation between XQS and, LSC, and USFR and, SSFR in ail patients (13) was significant at 3 months after RT. The correlation had a tendency to the decrease for USFR and, SSFR in proportion to the increase of XQS and, LSC. Conclusion : Based on the results of this study, IMRT seem to be an effective treatment to significantly decrease the xerostomia. XQS and, LSC seem to be a effective tool for predicting the xerostomia. A total parotid gland mean dose of <3,500 cGy should be a planning goal if substantial sparing of the gland function is desired. Furthermore, patients should be enrolled in a study to define a more accurate threshold dose for the parotid gland.

목적 : 세기조절방사선치료(IMRT)를 시행받은 두경부암 환자군에서 구강건조증 지표들을 측정시점별로 비교분석 하고 이 지표들과 이하선에 조사된 방사선량과의 연관성을 분석하고자 하였다. 대상 및 방법 : 2003년 2월부터 10월까지 두경부암으로 IMRT를 시행받은 13명을 대상으로 하였다. IMRT군의 연령은 43$\~$77세(중앙값 57세)이었고, 구강건조증을 평가하는 주관적 지표로서 4항목으로 구성된 구강지표점수(xerostomia questionnaire score: XQS)와 객관적 지표로서 자극유무에 따른 saliva의 분비량(unstimulated & stimulated salivary flow rate: USFR & SSFR)을 측정하였고, 주관적 그리고 객관적 통합지표로서 LENT SOMA scale(LSC)을 측정하였다. 측정시점은 치료 전, 치료 후 1개월, 3개월이었다. IMRT군 내에서 전체 환자군과 전체이하선에 조사된 평균방사선량을 기준으로 나눈 두 군에서의 측정시점에 따른 지표들 간 변화유무를 보았고, 나아가, 구강건조증지표들과 타액분비량 간의 상관관계를 분석하였다. 결과: IMRT군 전체13명 내에서 치료 전과 치료 후 1개월, 3개월에 측정된 XQS, LSC, USFR & SSFR은 유의한 변화가 없어 구강건조증의 발현이 관찰되지 않았다. 전체이하선에 조사된 평균선량 3,500 cGy를 기준으로 환자군을 나누어 보았을 때, 3,500 cGy 미만 조사받은 8명의 환자군에서는 유의한 변화가 없었으나 3,500 cOy이상 조사받은 5명의 환자군에서는 XQS, LSC, SSFR그리고 USFR이 유의하게 증가되어 구강건조증의 발현이 관찰되었다. 또한, 각 지표들과 타액분비량 간의 상관관계를 보았을 때, 치료 후 1개월째에서 유의한 상관관계를 보이지 않았으나, 치료 후 3개월째에서 XQS, LSC가 커질수록 USFR, SSFR이 감소하는 유의한 상관관계를 보였다. 결론: 본 연구결과 IMRT는 구강건조증을 상당한 정도로 감소시킬 수 있는 것으로 나타났고, XQS와 LSC이 유용한 임상지표로서의 가능성을 보였음을 알 수 있었다. 삶의 질을 저하할 정도의 심한 구강건조증을 피하기 위해서는 양측 이하선 전체에 조사되는 평균선량을 가능한 한 3,500 cGy미만으로 조사되도록 하여야 할 것으로 생각한다. 향후, 충분한 환자를 대상으로 하여 전체이하선의 평균선량에 대한 신뢰할 수 있는 결과와 나아가 타액의 분비량을 대신할 수 있는 임상적지표를 선정하는 연구가 진행되어야 할 것이다.

Keywords

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