Radiosensitivity uncertainty evaluation for the in vitro biophysical modeling of EMT6 cells

Masataka Oita, Yoshihiro Uto, Masahide Tominaga, Motoharu Sasaki, Yasuo Hara, Taro Kishi, Hitoshi Hori

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Background/Aim: The aims of this study were to evaluate the cell survival uncertainty distribution of radiation and to assess the accuracy of predictions of tumor response by using three different in vitro experimental cell cultures with radiosensitizers (including etanidazole). Materials and Methods: Using EMT6 cells and X-rays, the cell survival fraction was obtained from 15, 34, and 21 different experiments under normoxic, hypoxic, and hypoxic-plusradiosensitizer culture, respectively. Results: The αcoefficients were 0.257±0.188, 0.078±0.080, and 0.182±0.116 Gy-1, respectively. The β coefficients were 0.0159±0.0208, 0.0076±0.0113, and 0.0062±0.0077 Gy-2, respectively. The αcoefficient and the dose that killed half of the clonogens population (D50) were significantly different between normoxic cell and hypoxic cell cultures (p<0.01), respectively. The use of radiosensitizers under hypoxic conditions improved radiosensitivity. Conclusion: Our results suggest that parameter value distributions are required for biophysical modeling of applications for radiotherapy.

Original languageEnglish
Pages (from-to)4621-4626
Number of pages6
JournalAnticancer research
Issue number8
Publication statusPublished - Aug 1 2014


  • Biophysical modelling
  • In vitro
  • Radiosensitivity uncertainty
  • Radiotherapy

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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