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A short-term in vitro drug-screening assay for cancer chemotherapy
Abstract:
In this short-term in vitro assay for detection of tumor cell sensitivity to drugs, we have replaced the traditional soft-agar colony-forming assay with the measurement of DNA synthesis, to determine the cell renewal capability of the tumor cell population. The tumor cells are treated with drugs and cultured for five days. During the last 12--18 h of culture the cells are pulsed with [3H]thymidine, then harvested for scintillation counting. The effects of drugs are expressed as the percentage of DNA synthesis as compared with that of the control. When the % DNA synthesis is less than 40%, the drug is considered to be effective. So far we have studied tumor cells from multiple myeloma, non-Hodgkin's lymphoma, and carcinoma of lung, breast, ovary, stomach, and bladder. The overall negative predictive value is 1.0. The results are available within five days, compared with 21--28 days for completion of soft-agar assays; fewer cells are required; and the process is semiautomated.
Insights
This study introduces a rapid in vitro assay measuring DNA synthesis to assess tumor cell drug sensitivity, replacing slower traditional methods. The new assay provides results within five days, aiding faster treatment decisions for various cancers.
Area of Science:
- Oncology
- Pharmacology
- Biochemistry
Background:
- Traditional soft-agar colony-forming assays for drug sensitivity testing are time-consuming (21-28 days).
- Accurate and rapid assessment of tumor cell drug sensitivity is crucial for effective cancer treatment.
Purpose of the Study:
- To develop and validate a novel, rapid in vitro assay for determining tumor cell sensitivity to chemotherapeutic agents.
- To replace the traditional soft-agar assay with a more efficient method measuring DNA synthesis.
Main Methods:
- Tumor cells were cultured for five days with various drugs.
- DNA synthesis was measured using [3H]thymidine incorporation during the final 12-18 hours of culture.
- Drug efficacy was determined by the percentage of DNA synthesis compared to controls; <40% indicated effectiveness.
Main Results:
- The assay demonstrated a high negative predictive value (1.0) across multiple cancer types, including multiple myeloma, lymphoma, and carcinomas.
- Results were obtained within five days, significantly faster than the soft-agar assay.
- The assay requires fewer cells and is semiautomated, improving efficiency.
Conclusions:
- This DNA synthesis assay provides a rapid, reliable, and efficient method for evaluating tumor cell drug sensitivity in vitro.
- The assay has broad applicability across various cancer types, offering a valuable tool for personalized medicine.
- The accelerated turnaround time facilitates quicker therapeutic decisions in oncology.