In vitro versus in vivo correlations of chemosensitivity of human medulloblastoma.


Journal Article

An in vitro clonogenic assay was used to test the chemosensitivity of the human medulloblastoma cell line TE-671. Dose-response relationships for reduction in colony formation were generated for cyclophosphamide, vincristine, Adriamycin, 1,3-bis(2-chloroethyl)-1-nitrosourea (NSC 409962), and 1,4-cyclohexadiene-1,4-dicarbamic acid, 2,5-bis(1-aziridinyl)-3,6-dioxo-diethylester (NSC 182986); and the in vitro drug dose at which there is a 75% reduction in the number of colonies in comparison to controls (ID75S) were derived from these data. Methotrexate produced no colony reduction at any dose tested up to 1000 micrograms/ml. The in vitro results were compared to growth delays in s.c. TE-671 xenografts in athymic mice treated with the same agents. Agents with an ID75 less than assumed in vivo plasma drug concentrations were all active in vivo, whereas two of the three agents with an ID75 greater than assumed in vivo plasma drug concentrations demonstrated no in vivo activity. These results suggest that for these agents, the relationship between the ID75 of the drug and its in vivo concentration allows in vitro clonogenic assay results to agree with in vivo growth delay responses.

Full Text

Duke Authors

Cited Authors

  • Friedman, HS; Schold, SC; Muhlbaier, LH; Bjornsson, TD; Bigner, DD

Published Date

  • November 1, 1984

Published In

Volume / Issue

  • 44 / 11

Start / End Page

  • 5145 - 5149

PubMed ID

  • 6488174

Pubmed Central ID

  • 6488174

International Standard Serial Number (ISSN)

  • 0008-5472


  • eng

Conference Location

  • United States