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The sensitivity testing of Wilms' tumors to cytostatic agents with an autoradiographic in vitro short-term test
Abstract:
Sensitivity of 15 Wilm's tumors in children was tested towards cytostatic agents in vitro by means of an autoradiographic short-term test. Sensitivity was measured as a magnitude of the inhibition of 3H-thymidine, resp. 3H-uridine incorporation. The test was performed with Adriamycin, Actinomycin D. Daunomycin, Bleomycin, Cyclophosphamide, Ifosfamide, Trenimon, and Arabinosylcytosine. None of the tumors is resistant to all substances, they are responsive against 2 or more drugs. The most effective drugs tested are Adriamycin, Actinomycin D and Cyclophosphamide. The tumors show a marked individual sensitivity pattern. This behavior is explained mainly by the usually high proliferative activity of Wilms' tumors. The possibilities and limits of long-term and short-term methods for sensitivity testing are discussed critically. For the evaluation of the results of in vitro testing and in vivo effectiveness the close correlation should be considered between the type of cytostatic agent and proliferation kinetics of the tumor, cytostatic agent and effect on tumor metabolism as well as the effect of the cytostatics and the nucleic acid precursors used for the short-term test. Despite the methodological limitations preclinical testing should be preferred to unselected chemotherapy.
Insights
Pediatric Wilm's tumors show varied sensitivity to chemotherapy drugs in vitro. Adriamycin, Actinomycin D, and Cyclophosphamide were most effective, indicating personalized treatment potential.
Area of Science:
- Pediatric Oncology
- Pharmacology
- Cancer Research
Background:
- Wilm's tumor is a common pediatric kidney cancer.
- Chemotherapy is a primary treatment modality for Wilm's tumor.
- Predicting individual tumor response to chemotherapy remains a challenge.
Purpose of the Study:
- To evaluate the in vitro sensitivity of pediatric Wilm's tumors to various cytostatic agents.
- To identify the most effective chemotherapeutic drugs for Wilm's tumors.
- To explore the correlation between tumor characteristics and drug response.
Main Methods:
- Utilized an autoradiographic short-term test to assess drug sensitivity in 15 Wilm's tumor samples.
- Measured sensitivity by the inhibition of 3H-thymidine and 3H-uridine incorporation.
- Tested the efficacy of Adriamycin, Actinomycin D, Daunomycin, Bleomycin, Cyclophosphamide, Ifosfamide, Trenimon, and Arabinosylcytosine.
Main Results:
- All tested Wilm's tumors exhibited sensitivity to at least two different cytostatic agents.
- Adriamycin, Actinomycin D, and Cyclophosphamide demonstrated the highest efficacy across the tumor samples.
- A distinct individual sensitivity pattern was observed for each tumor, potentially linked to high proliferative activity.
Conclusions:
- In vitro drug sensitivity testing can reveal individual Wilm's tumor responses to chemotherapy.
- Personalized chemotherapy selection based on in vitro testing may improve treatment outcomes.
- Methodological limitations necessitate careful interpretation, but preclinical testing is valuable for guiding treatment decisions over unselected chemotherapy.