Influence of tumor cell and stroma sensitivity on tumor response to radiation

Kazuhiko Ogawa, Yves Boucher, Satoshi Kashiwagi, Dai Fukumura, David Chen, Leo E. Gerweck

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


In this study, we evaluated the role of tumor cell and tumor stroma sensitivity as determinants of radiation-induced tumor growth delay. A DNA double-strand break repair-defective DNA-PKcs-/- tumor cell line and its radioresistant DNA-PKcs+/+-transfected counterpart were used to initiate tumors in nude and hypersensitive severe combined immunodeficient (SCID) mice. Insertion of the human DNA-PKcs+/+ gene substantially increased the intrinsic radioresistance of the DNA-PKcs-/- tumor cells and substantially decreased tumor response to radiation in both nude and hypersensitive SCID mice. Tumor cell radiosensitivity was the major determinant of tumor response in nude mice. In SCID mice, both tumor cell sensitivity and radiation-induced stromal damage contributed to response. The relative contribution of host and tumor cell sensitivity on tumor response was unchanged for single doses of 1 x 15 and 6 x 3 Gy-fractionated dose irradiation.

Original languageEnglish (US)
Pages (from-to)4016-4021
Number of pages6
JournalCancer research
Issue number9
StatePublished - May 1 2007

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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