Radiation-induced cytogenetic instability in vivo

Robert L. Ullrich, Claude M. Davis

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Radiation-induced cytogenetic instability has been well documented in a number of laboratories, and we have hypothesized that such instability is the initiating event in the process leading to radiation-induced cancer. To date most studies of radiation-induced instability have used systems in which cells are rapidly dividing. For this phenomenon to have significance for radiation carcinogenesis, it must be established that instability can be induced in vivo in less rapidly dividing fully differentiated tissues known to be at risk. In the present study, we have examined the kinetics of radiation-induced cytogenetic instability in mammary epithelial cells after irradiation in vivo. Having established that instability could arise in vivo in intact mammary tissue, we subsequently demonstrated a dose-response relationship both in vitro and in vivo and demonstrated a lower frequency of instability after fractionated exposures.

Original languageEnglish (US)
Pages (from-to)170-173
Number of pages4
JournalRadiation research
Issue number2
StatePublished - Aug 1999

ASJC Scopus subject areas

  • Biophysics
  • Radiation
  • Radiology Nuclear Medicine and imaging


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