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  • 1
    ISSN: 1573-0646
    Keywords: dihydrolenperone ; drug evaluation ; drug screening assays ; antitumor ; carcinoma ; non-small cell lung carcinoma ; oat cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Antitumor activity of the butyrophenone dihydrolenperone in non-small cell lung cancer was initially suggested byin vitro screening against tumor cells derived from fresh surgical samples using the human tumor colony-forming assay. We have completed a directed phase I trial in patients with lung cancer. Thirty-two patients with lung cancer have completed 25 courses of therapy at doses of 10 to 60 mg/square meter orally on a twice daily schedule. Twenty-three men and 9 women with a median age of 55 (range 24–69) were entered. Twenty-four were performance status 0 or 1 and 8 were 2. The maximum tolerated dose was 50 mg/square meter orally twice daily and the dose limiting toxicity was somnolence. Of the 32 patients, 18 developed symptomatic hypotension (grade 1 or 2). There was no significant hematologic, renal, or hepatic toxicity.In vitro drug testing using the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (thiazolyl blue)] assay confirmed 50% inhibition of non-small cell and small cell lung cancer cell line growth at 70–450 micromolar concentrations. Plasma dihydrolenperone levels were at least 75-fold less than levels at whichin vitro activity was observed. We conclude: 1) the maximum tolerated dose in our study is 50 mg/square meter orally twice daily, 2) the dose-limiting side effect of dihydrolenperone is somnolence, and 3) the concentrations of dihydrolenperone observed in plasma are significantly lower than those associated within vitro activity.
    Type of Medium: Electronic Resource
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