Observations have been performed on peripheral blood lymphocytes from
a patient having ingested 200 mg thallium sulfate, in order to evaluat
e the ability of the compound to produce cytogenetic damage in vivo in
humans. Our results demonstrate that neither the yield of structural
chromosome aberrations nor sister chromatid exchanges were significant
ly modified The drastic increase of binucleated cells with micronuclei
indicates that thallium sulfate has in common with many metallic comp
ounds the ability to interfere with chromosome distribution.