Related Experiment Videos
The spontaneous regression of neoplasms in mammals: possible mechanisms and their application in immunotherapy
1Department of Pathology, School of Medicine, University of Southern California, Los Angeles, USA.
Abstract:
In mammalian cells, neoplastic transformation is directly associated with the expression of oncogenes, with the mutation, loss or simple inactivation of the function of tumor suppressor genes, and the production of certain growth factors. Genes for suppression of the development of the malignant immunophenotype, as well as inhibitory growth factors have regulatory functions within the normal processes of cell division and differentiation. Telomerase (a ribonucleoprotein polymerase) activation is frequently observed in various cancers. Telomerase activation is regarded as essential for cell immortalization and its inhibition may result in the spontaneous regression (SR) of neoplasms. SR of neoplasms occurs when the malignant tumor mass partially or completely disappears without any treatment or as a result of a therapy considered inadequate to influence systemic neoplastic disease. This definition makes it clear that the term SR applies to neoplasms in which the malignant disease is not necessarily cured, and to cases where the regression may be neither complete nor permanent. A number of possible mechanisms of SR are reviewed, with the understanding that no single mechanism can completely account for this phenomenon. The application of the newest immunological, molecular biological and genetic insights for more individualized anticancer immunotherapy (biotherapy) is also discussed.
Insights
Cancer cells can undergo spontaneous regression (SR) through various mechanisms, including telomerase inhibition. Understanding these processes may lead to new individualized cancer immunotherapies.
Area of Science:
- Oncology
- Molecular Biology
- Immunology
Background:
- Neoplastic transformation involves oncogenes, tumor suppressor genes, and growth factors.
- Telomerase activation is crucial for cancer cell immortalization and is frequently observed in malignancies.
Purpose of the Study:
- To review mechanisms of spontaneous regression (SR) of neoplasms.
- To discuss the role of telomerase inhibition in SR.
- To explore advancements in individualized anticancer immunotherapy.
Main Methods:
- Review of existing literature on neoplastic transformation, telomerase, and spontaneous regression.
- Analysis of molecular, genetic, and immunological insights into cancer regression.
- Discussion of potential therapeutic strategies.
Main Results:
- Telomerase activation is essential for cancer cell immortalization.
- Inhibition of telomerase may induce spontaneous regression of neoplasms.
- Spontaneous regression can be partial or complete, and not always permanent or curative.
Conclusions:
- No single mechanism fully explains spontaneous regression.
- Individualized anticancer immunotherapy, informed by molecular and genetic insights, holds promise.
- Further research into telomerase inhibition and SR mechanisms is warranted.