title: The effect of fractionated exposure to thio-TEPA upon Chinese hamster cells in vitro.
abstract: The dependence of the surviving fraction of Chinese hamster cells in vitro upon the concentration of Thio-TEPA, upon the duration of drug exposure and upon fractionation of drug exposure has been studied. Given a constant exposure time, the surviving fraction decreased according to a "shoulder" curve with increasing concentration. Given a constant concentration, the surviving fraction decreased exponentially with increasing exposure time. Splitting exposure of 60 min into two 30 minutes' exposures with drug-free intervals of several hours increased the cytostatic effect of Thio-TEPA.
mesh_terms: D000818:Animals; D002470:Cell Survival / Q000187:drug effects*; D006224:Cricetinae; D004334:Drug Administration Schedule; D066298:In Vitro Techniques; D009369:Neoplasms / Q000188:drug therapy; D013852:Thiotepa / Q000008:administration & dosage* / Q000627:therapeutic use
chemical_list: D013852:Thiotepa