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Testing Targeted Therapies in Cancer using Structural DNA Alteration Analysis and Patient-Derived Xenografts
Published on: July 25, 2020
Present status and problems on molecular targeted therapy of cancer
1Division of Medical Oncology, Kinki University School of Medicine, Osaka, Japan.
Abstract:
Numerous clinical trials of molecular targeted drugs for cancer have been conducted, with remarkable results for certain drugs and accumulation of "negative data" causing a hitch in the development plan for some other compounds. Five recent issues and problems of molecular targeted therapies were discussed critically. Drug discovery and effects against driver mutations (activating mutations) and problems: possibility for circumventing inherent and acquired resistance with the aim of achieving radical cure. Synthetic lethality: reasonable patient selection in individualized treatment strategy. Response rate and progression-free survival improvement with or without overall survival benefit and enhancement of toxicity in bevacizumab therapy: best endpoints for the evaluation of effect of antiangiogenic therapy. Negative data on small-molecule targeted therapy, primarily vascular endothelial growth factor tyrosine kinase inhibitors: loose GO or NO-GO decision criteria for further development of new compounds in early clinical trials. Effect of immunotherapy: difficulty to verify by proof of principle study. We are faced to many questions for the development of efficient personalized therapy. Accumulation of scientific global preclinical and clinical evidences is essential to use these new therapeutic modalities for the improvement of oncologic health care.
Insights
Molecular targeted cancer therapies show promise but face challenges like resistance and "negative data." Further research and evidence are crucial for developing effective personalized cancer treatments.
Area of Science:
- Oncology
- Pharmacology
- Genetics
Background:
- Molecular targeted drugs have yielded significant results in cancer treatment.
- However, accumulated negative data and challenges hinder the development of some compounds.
Purpose of the Study:
- Critically discuss five recent issues and problems in molecular targeted therapies.
- Address challenges in drug discovery, resistance, patient selection, endpoint evaluation, and immunotherapy.
Main Methods:
- Review of clinical trial data and scientific literature on molecular targeted therapies.
- Critical analysis of issues including drug resistance, synthetic lethality, and endpoint selection.
Main Results:
- Drug resistance to targeted therapies targeting driver mutations remains a challenge.
- Synthetic lethality offers potential for patient selection in personalized medicine.
- Antiangiogenic therapies like bevacizumab show improved progression-free survival but can increase toxicity.
Conclusions:
- Development of targeted therapies faces hurdles such as resistance and unclear decision criteria for new compounds.
- Evaluating immunotherapy efficacy requires robust proof-of-principle studies.
- Accumulating global evidence is essential for advancing personalized oncologic care.
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