Is Gene Therapy the Next Cancer Treatment Revolution?
Gene Therapy is now touted as a new revolution for cancer treatment. If the list of new cancer treatment methodologies is traversed, then the end seems to be farther and farther away. As a sequel to the relentless efforts by researchers across the world to formulate therapies better than the existing ones, new prospective cures pop up every now and then; and some of which are also considered as superior treatments of the future. The latest buzz doing the rounds is the Gene Therapy, which is speculated to revolutionize cancer treatment in the future.
In essence, the therapy involves correcting defects in the genes to cure diseases, including cancer. As a matter of fact, genes are the fundamental regulators of cells. Genes contain the protein codes, which enable the cells to grow, function and divide. Any deviation in the genes will result in malfunction(s) in cells, resulting in various types of diseases. Defective genes can trigger the production of proteins that cannot function properly. Missing or overactive genes can impair bodily functions. And the list goes on. The crux of the Gene Therapy is to fix defects in the genes so that the resultant disease gets cured. Progress in R&D has also entailed the capability to replace abnormal or non-existent genes with healthy ones for enabling the production of useful proteins.
Coming to the moot point—Gene Therapy in cancer treatment, enormous efforts have been put in to utilize the therapy in cancer treatment. Although almost all of the prospective therapies are in the exploratory stages (being studied in laboratories or in clinical trials), one of the approaches, called as the CAR T-cell Therapy, has received approval from the USFDA for administering the therapy in certain groups of patients. Additional approvals to the CAR T-cell Therapy are expected in the imminent future.
The ongoing research on the application of Gene Therapy in cancer treatment is inclusive of multiple areas, in the guise of:
Genetically Engineered Viruses
In this approach, specially modified viruses (called as Oncolytic viruses) are put to target and destroy cancer cells, while being harmless to normal cells. The viruses are engineered to contain certain genes, designed to infect cancer cells, those when get inside cancer cells produce specific proteins, which cause the cancer cells to die. This method has elicited encouraging clinical trial results.
A foreign gene is inserted directly into the cancer cell or the surrounding tissue that kills the cancer cell or prevent cancer cells and surrounding tissue from feeding blood to tumours, reducing nutrients for the cancer cell for survival. Despite some challenges, this method bears substantial promise for treating cancer in the future.
This technique involves enhancing the natural cancer-fighting ability of the tumour cells of the patient himself. One of the types of Immunotherapy is the CAR T-cell Therapy, in which a sample of T cells of the patient is collected and mixed with viruses carrying several specific genes. The viruses act as carriers by transporting the genes to the nuclei of the T-cells, incorporating into the DNA of the cells. The genes activate the T-cells to express a special protein called as a Chimeric Antigen Receptor, or CAR, on the surface. The CAR transports the T cell to the tumour cell using a specific address, and the CAR T-cell is then empowered to quickly destroy the cancer cell. Dramatic results obtained in clinical trials conducted in some children and adults with leukaemia or lymphoma have led to the belief that the CAR T-cell Therapy will be a promising future therapy for cancer treatment.
What is the fate of the prospective Gene Therapy based cancer treatments under the research phase? What is the progress and prospects of the therapy in cancer treatment? Will the Gene Therapy eventually turn out to be the one-stop therapy for all cancer types?
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