Certain factors are capable of causing cancer in a proportion of individuals exposed to them. These include heredity, chemicals, ionizing radiation, infection or viruses, and trauma. Researchers study how these different factors may interact in a sequential manner to produce multifactorial and malignant tumors. Cancer is, in essence, a genetic process. Genetic alterations can be inherited, or produced in a cell by a virus or an injury caused externally.
It is estimated that 5 to 10% of cancers are hereditary. Some forms of cancer are more common in some families, breast cancer is an example. Colon cancer is more common in families with a tendency to have colon polyps. A form of retinoblastoma appears only when a specific gene is absent. These genes, called tumor suppressor genes or anti-oncogenes, in normal conditions prevent cell replication. Their absence removes the normal control of cell division. In some inherited disorders, chromosomes have an intrinsic fragility, these processes involve a high risk of cancer.
Coal tar and its derivatives are considered to be highly carcinogenic. Its vapors in some industries (eg refineries) are associated with the high incidence of lung cancer among workers.
Today it is known that benzopyrene, a chemical present in coal, causes skin cancer in people whose jobs are related to coal combustion.
Arsenic is associated with lung cancer, as workers of copper and cobalt mines, smelters and factories of insecticides have an incidence of this cancer greater than normal. Workers in the asbestos-related industries, the incidence is up to 10 times more than normal.
A substance produced by the fungus Aspergillus flavus, called aflatoxin, which contaminates food and poorly preserved, causes liver cancer in some animals. It has been found that in countries where food contamination by molds is common, the incidence of liver and stomach cancer is high.
Smoking is another carcinogen, has determined that lung cancer death is 6 times higher among smokers than among nonsmokers. The cigarette is as harmful because it contains substances, nicotine, acids and oxides of carbon and tar.
Alcohol is also a major sponsor, its chronic abuse significantly increases the risk of cancers that are induced by other agents.
Ionizing radiation is one of the most recognized causal factors. Radiation can cause changes in DNA, such as breakage or chromosomal transpositions in which the broken ends of two chromosomes can be exchanged. The radiation acts as an initiator of carcinogenesis, inducing alterations that progress to cancer after a latency period of several years. The sun's ultraviolet rays and X-rays increase the propensity to get skin cancer and leukemia. Lso excessive exposure to sunlight, by people with white skin, increases the risk.
Virus or infections
There is increasing evidence that some infections can eventually cause cancer, and in particular those related to cancers of the stomach, liver, cervix and Kaposi sarcoma (a special type of cancer that occurs in AIDS patients). It has linked the bacterium Helicobacter pylori with stomach cancer. Several studies show that people infected with this bacterium are four times more likely to develop this cancer.
Viruses are the cause of many cancers in animals. In humans, the Epstein-Barr virus associated with Burkitt lymphoma and lymphoepitheliomas, virus hepatitis with hepatocellular carcinoma and type II herpes or genital herpes with cervical carcinoma. All of these viruses associated with human tumors are of the DNA. HTLV virus, however, is of type RNA, or retroviruses, like most of the viruses associated with tumors in animals. Produces a human leukemia. In the presence of an enzyme called reverse transcriptase, induces the infected cell to produce DNA copies of the genes of the virus, thus incorporated into the cellular genome. These RNA virus containing a gene called viral oncogene capable of transforming normal cells into malignant cells. Research has shown that viral oncogenes have a counterpart in normal human cells: the proto-oncogene, or cellular oncogene. The products of oncogenes (the proteins they produce) are growth factors (or proteins necessary for the action of such growth factors), which stimulate the growth of tumor cells.
Is considered detrimental mechanical irritation produced on a portion of the skin and the friction exerted on moles. Lip cancer in pipe smokers is associated with chronic irritation caused by the pipe about a group of cells in the lip. In India, a high incidence of cancer of the abdomen and groin is related to the dress (a sort of loincloth) of widespread use.
Common viruses may cause cancer
The study also increasing concern about the use of fusogenic viruses as vectors for human gene therapy or in other clinical applications, because of the possibility that such viruses cause cancer.
The idea that aberrations in the number or structure of chromosomes forming tumors have more than one century old. Such aberrations, known collectively as "aneuploidy", originate in two main ways: as a result of abnormal cell division or as a result of cell fusion. By either mechanism, the resulting aneuploid cells no longer have the proper genetic makeup and frequently die. But researchers now know that tumor cells are often aneuploid and survive. Whether aneuploidy is a cause or a consequence of a cancerous cellular state is the crux of the matter, and matter of debate.
In a recent study, Dr. Yuri Lazebnik and his colleagues at Cold Spring Harbor Laboratory observed, fortuitously, that normal cultured human cells are fused by the action of the Mason-Pfizer Virus Monkey (MPMV), but the resulting hybrid cells can not proliferate. However, the researchers found that if one of the fusion partners carried a particular genetic mutation (in the oncogenes E1A or Myc, or p53 tumor suppressor gene), a significant proportion of the resulting hybrid cells are highly proliferative and thus potentially carcinogenic.
Must be determined whether such cells are proliferating hybrid virus produced by the human body, and if they lead to cancer, and which of the many known human fusogenic viruses (eg, endogenous retroviruses, which DNA sequences comprise at least 8 percent the human genome) might contribute to cancer.
In addition to revealing that common viruses may contribute to cancer by cell fusion, alert investigators that the use of fusogenic viruses as vectors for gene therapy or in other clinical applications should be carefully evaluated.
A study that used more than 15 years for verification indicates that the "cancer metastasis," is nothing more than an order that some part of the brain sends to a specific organ, when there is an alteration, mental, or physical in an individual . Later in another post delivery, evidence from this study.
Here an update on the origins of cancer:
Subject: News about cancer, John Hopkins Hospital (of the United States)
- We all have cancer cells. These cells do not appear in the standard tests until they have multiplied by billions. When a doctor tells a cancer patient who has no cancer cells in their bodies after treatment, means that the tests are unable to detect the cancer cells because the amount of them have not reached the amount required to be detected in normal analysis.
- Cancer cells occur between 6 to 10 times in a person's life.
- When a person's immune system is strong the cancer cells are destroyed and prevented from multiplying and forming tumors.
- When a person has cancer it indicates the person has multiple nutritional deficiencies. These may be genetic, environmental, food or lifestyle factors.
- To overcome the multiple nutritional deficiencies and strengthen the immune system, we recommend a change in diet, including supplements.
- Chemotherapy involves poisoning the rapidly-growing cancer cells, but also destroys cells in the bone marrow, intestinal tract, etc.. and can cause organ damage, like liver, kidneys, heart, lungs.
- Radiation while destroying cancer cells also burns, scars and damages healthy cells, tissues and organs.
- Initial treatment with chemotherapy and radiation will often reduce tumor size. However, prolonged use of chemotherapy and radiation do not result in more tumor destruction.
- When the body has too much toxic burden from chemotherapy and radiation the immune system is compromised or destroyed, then the person can succumb to various kinds of infections and complications.
- Chemotherapy and radiation can cause cancer cells to mutate and become resistant and difficult to destroy. Surgery can also cause cancer cells to spread to other parts of the body.
- An effective way to battle cancer is to not feed the cancer cells with foods that need to multiply, and so starve.
cancer cells feed on:
- Sugar is a cancer-feeder. By eliminating sugar from our diet removes a food supply to the proliferation of cancer cells. Sugar substitutes like NutraSweet, Equal, Spoonful, etc are made with Aspartame and it is harmful. A better substitute for sugar is honey and molasses but only in small quantities. A table salt is a chemical added to make it white, and this is stimulating cancer cells. The best alternative is Bragg's aminos or sea salt.
- Milk causes the body to produce mucus, especially in the gastro-intestinal tract. Cancer feeds on mucus. By cutting off milk and substituting with unsweetened soy milk, cancer cells are deprived of their food and die.
- Cancer cells thrive in an acidic environment. A based diet of red meat is acidic and it is best to eat fish and white meat (chicken) instead of beef or pork. Meat also contains livestock antibiotics, growth hormones and parasites, which are all harmful, especially to people with cancer.
- A diet made of 80% fresh vegetables and juice, whole grains, seeds, nuts and a little fruits help create an alkaline environment. The remaining 20% of the feed can be from cooked food including beans. The Fresh vegetable juices provide live enzymes that are easily absorbed and reach down to cellular levels within 15 minutes to nourish and enhance growth of healthy cells. Drink fresh vegetable juice (including bean sprouts) to obtain live enzymes for building healthy cells, eat some raw vegetables 2 or 3 times a day. Enzymes are destroyed at temperatures of 40 º C (104 ° F), so cook your vegetables at temperatures below 40 ° C.
- Avoid coffee, tea and chocolate, which have high caffeine. Green tea is a better alternative and has cancer fighting properties. It is best to drink purified water, or filtered, to avoid known toxins and heavy metals in the water. Distilled water is acidic and therefore avoid it.
- Meat protein is difficult to digest and requires a lot of digestive enzymes. Undigested meat remaining in the intestines becomes putrefied and leads to more toxins.
- The cell walls have a tough protein covering. To reduce the intake of meat it frees more enzymes to attack the outer wall of the diseased cells, allowing a greater number of destroying cancer cells.
- Some supplements build up the immune system (antioxidants, vitamins, minerals, essential fatty acids, etc.). Which helps the body's own killer cells to destroy cancer cells. Other supplements like vitamin E, cause apoptosis, or programmed cell death, which is the normal method of disposing of the body cells of damaged, unwanted or unnecessary.
- Cancer is a disease of the mind, body and spirit. A proactive and positive spirit will help them survive a person with cancer .. Anger, unforgiveness and bitterness put into a stressful and acidic environment agency. Learn to have a heart filled with love and forgiveness will help improve the conditions of cancer. Learn to relax and to enjoy life.
- Cancer cells can not thrive in an oxygenated environment so Exercising daily and deep breathing, helping cells get more oxygen. Oxygen therapy is another means employed to destroy cancer cells.