Evaluation of variability in target volume delineation for newly diagnosed glioblastoma: A multi-institutional study from the Korean Radiation Oncology Group

Chan Woo Wee, Wonmo Sung, Hyun Cheol Kang, Kwan Ho Cho, Tae Jin Han, Bae Kwon Jeong, Jae Uk Jeong, Haeyoung Kim, In Ah Kim, Jin Hee Kim, Sung Hwan Kim, Suzy Kim, Dong Soo Lee, Me Yeon Lee, Do Hoon Lim, Hye Li Park, Chang Ok Suh, Sang Min Yoon, Il Han Kim

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Abstract

Background: This study aimed for a collaborative evaluation of variability in the target volumes for glioblastoma, determined and contoured by different radiotherapy (RT) facilities in Korea. Methods: Fifteen panels of radiation oncologists from independent institutions contoured the gross target volumes (GTVs) and clinical target volumes (CTVs) for 3-dimensional conformal RT or intensity-modulated RT on each simulation CT images, after scrutinizing the enhanced T1-weighted and T2-weighted-fluid-attenuated inversion recovery MR images of 9 different cases of glioblastoma. Degrees of contouring agreement were analyzed by the kappa statistics. Using the algorithm of simultaneous truth and performance level estimation (STAPLE), GTVSTAPLE and CTVSTAPLE contours were derived. Results: Contour agreement was moderate (mean kappa 0.58) among the GTVs and was substantial (mean kappa 0.65) among the CTVs. However, each panels' GTVs and modification of CTVs regarding anatomical structures varied. Three-fourth of contoured panels' CTVs encompassed the peritumoral areas of T2-high signal intensity (T2-HSI). Nine of nine GTVSTAPLE encompased the surgical cavity and the T1-enhanced lesions. Eight of nine CTVSTAPLE encompassed the peritumoral T2-HSI area. The median MARGIN90 and the median MARGIN95 were 1.4 cm and 1.5 cm, respectively. Conclusions: Moderate to substantial agreement existed in target volumes for 3-dimensional or intensity-modulated RT determined by radiation oncologists in Korea. According to the estimated consensus contours, the initial CTV encompassed the GTV with margin less than 2.0 cm and the whole peritumoral areas of T2-HSI. The findings of our study propose the need for further studies and modified guidelines.

Original languageEnglish
Article number137
JournalRadiation Oncology
Volume10
Issue number1
DOIs
Publication statusPublished - 2015 Jul 2

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All Science Journal Classification (ASJC) codes

  • Oncology
  • Radiology Nuclear Medicine and imaging

Cite this

Wee, C. W., Sung, W., Kang, H. C., Cho, K. H., Han, T. J., Jeong, B. K., Jeong, J. U., Kim, H., Kim, I. A., Kim, J. H., Kim, S. H., Kim, S., Lee, D. S., Lee, M. Y., Lim, D. H., Park, H. L., Suh, C. O., Yoon, S. M., & Kim, I. H. (2015). Evaluation of variability in target volume delineation for newly diagnosed glioblastoma: A multi-institutional study from the Korean Radiation Oncology Group. Radiation Oncology, 10(1), [137]. https://doi.org/10.1186/s13014-015-0439-z