In vitro drug sensitivity testing in human gliomas.

Area of Science:

• Oncology
• Pharmacology
• Cell Biology

Background:

• In vitro drug sensitivity assays aim to predict patient response to chemotherapy.
• Commonly used assays include colony-forming, radiolabeled precursor inhibition, and microcytotoxicity assays.

Purpose of the Study:

• To evaluate the predictive accuracy and limitations of in vitro drug sensitivity assays for chemotherapy.
• To identify areas for improvement in assay methodology and interpretation.

Main Methods:

• Review of retrospective studies on in vitro drug sensitivity assays.
• Analysis of common assay types: colony-forming, radiolabeled precursor inhibition, and microcytotoxicity.

Main Results:

• Assays predict clinical resistance in nearly 100% of patients.
• Predictive accuracy for clinical response ranges from 50% to 70% in retrospective studies.
• Assays face technical and theoretical challenges, including reliance on cell culture and potential for chemosensitivity heterogeneity.

Conclusions:

• In vitro assays demonstrate high accuracy in predicting chemotherapy resistance.
• Current assays have limitations in accurately predicting clinical response and require further investigation.
• Verification of malignant cell origin in cultures is crucial for reliable assay interpretation and clinical application.