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Prediction of individual response to chemotherapy in patients with acute myeloid leukaemia using the chemosensitivity index C i
Author(s) -
Staib Peter,
Staltmeier Elke,
Neurohr Katja,
Cornely Oliver,
Reiser Marcel,
Schinköthe Timo
Publication year - 2005
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.2005.05402.x
Subject(s) - oncology , ex vivo , chemosensitivity assay , medicine , myeloid leukaemia , proportional hazards model , chemotherapy , in vivo , induction chemotherapy , multivariate analysis , biology , microbiology and biotechnology
Summary As the response to chemotherapy in patients with acute myeloid leukaemia (AML) may still not be accurately determined by known prognostic factors, such as karyotype, the ex vivo chemosensitivity profile may help to predict the individual response. The predictive accuracy of an ex vivo assay should be assessed by correlation of assay results with both response rate and survival. We prospectively investigated the prognostic relevance of pre‐therapeutic ex vivo chemosensitivity testing in primary cell cultures from adult AML patients by applying a new evaluation methodology, designated the chemosensitivity index, C i . This C i was designed as a prognostic index by taking the area under the curve as an exact measure of the total dose–response relationship. We found an overall predictive accuracy of 98·2% concerning treatment response, which compares favourably with previously published data ranging from 75% to 92%. Moreover, the C i proved to be the strongest prognostic factor for overall survival in a multivariate Cox regression analysis including karyotype grouping and age ( P < 0·001), and enabled the evaluation of response to combination therapies and selection of possible treatment alternatives. Our data suggest that ex vivo chemosensitivity testing evaluated by the C i could serve as a powerful tool for assay‐directed therapy strategies in AML.