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Gene therapy for human cancer: an essay for clinicians
M J Mastrangelo1, D Berd, F E Nathan
1Department of Medicine, Jefferson Medical College, Philadelphia, Pennsylvania, USA.
Abstract:
In the last decade our understanding of the processes that govern growth and differentiation has become quite sophisticated. A variety of tumor suppressor genes and more than 100 oncogenes have been identified. The roles of developmental genes in shaping the expression of neoplasia and of defective housekeeping genes in allowing mutations to persist and be transcribed have been appreciated. These advances have revolutionized our ability to diagnose and to formulate prognoses for patients with cancer. However, successful gene therapy for cancer has been elusive. This review highlights the current approaches to gene therapy for cancer and their scientific bases. The requirement that the therapy repair or destroy every cancer cell seems an insurmountable hurdle. Environmental manipulation through systemic administration of exogenous antisense may circumvent this problem in cases where it is appropriate. The more practical application of the technology of genetic engineering to facilitate cancer chemotherapy and immunotherapy is also reviewed. Particularly encouraging are the preclinical and clinical results of in vivo, in situ gene transfer. It remains to be determined if this local approach impacts favorably on survival.
Insights
Gene therapy for cancer shows promise, particularly with in vivo, in situ gene transfer. While challenges remain, genetic engineering offers new avenues for cancer treatment and immunotherapy.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- Significant advances in understanding cancer growth and differentiation.
- Identification of numerous tumor suppressor genes and oncogenes.
- Appreciation of oncogenes' roles in neoplasia and defective genes in mutation persistence.
Purpose of the Study:
- Review current gene therapy approaches for cancer.
- Discuss the scientific basis of these therapies.
- Explore practical applications of genetic engineering in cancer treatment.
Main Methods:
- Review of existing literature on cancer gene therapy.
- Analysis of preclinical and clinical data for in vivo, in situ gene transfer.
- Evaluation of systemic antisense administration strategies.
Main Results:
- Gene therapy for cancer faces challenges, especially in eradicating all cancer cells.
- Systemic administration of exogenous antisense may offer a viable approach.
- In vivo, in situ gene transfer shows encouraging preclinical and clinical results.
Conclusions:
- Genetic engineering offers practical applications for enhancing cancer chemotherapy and immunotherapy.
- Local gene transfer approaches (in vivo, in situ) are promising but require further study to confirm survival benefits.
- Successful gene therapy for cancer remains an evolving field with ongoing research and development.