Why would a cancer
But until now, we still did not find a way to capture cancer. What is cancer? It come from, but also how harmful? One problem: how to wear down the human cancer
First, cancer, also known as malignant tumors, compared with benign tumors. Cancer is caused by the body in a variety of factors, the local tissue cells dysplasia formed by local mass. Benign tumors easily cleared away, not normally, which is the recurrence of organs, tissues and obstructive role only squeeze. But malignant tumors also can damage tissues and organs of the structure and functions of the merger caused hemorrhagic necrosis infection, the patient may end up as organ failure and death.
Cancer is the basic unit of lesions cancer cells. After the death of the aging of human cells will be new cells replace it, to maintain body functions. Clearly, the vast majority of human cells can be proliferated, but this proliferation is limited, and cancer cell proliferation is endless, making the body with nutrients by the amount consumed. At the same time, cancer cells can also release a variety of toxins, so that the body produce a series of symptoms. If not timely detection and treatment, it may also be transferred to the growth and reproduction throughout the body, eventually led to human suffering from weight loss, weakness, anemia, loss of appetite, fever and organ damage, and so on.
Almost every aspect of human potential against cancer. Originally, the human biological machines operating in this seamless, but cancer has changed this situation, the task is to destroy it. If it continues, will wear down the body. However, unlike tumor virus, not in vitro invaders, and its composition and normal tissue, so it could not identify the body immune.
Issue 2: The cancer cells came from Ho
Cited For example: the human body is composed of cells from one community. Each cell acting according to regulations, know when the growth division, know how and other cells to form tissues and organs. Construction of different organizations and the “drawings” that gene.
Many people say that the human body has cancer, but not developed. From a medical perspective, if we can identify cancer cells, the diagnosis can be a person with cancer. So, this is not correct. Now medical experts think: Everyone in both oncogene, absolutely not everyone has cancer cells in vivo.
Oncogene charge of cell division and proliferation, human growth need it. In order to “control” it, there are tumor suppressor gene in the human body. In peacetime, proto-oncogenes and tumor suppressor genes to maintain a balanced, but in the role of carcinogenic factor, the oncogene forces girth, and the tumor suppressor gene has become weak. Therefore, the carcinogenic factor is the growth of cancer cells start, “key”, mainly including mental factors, genetic factors, lifestyle, certain chemical substances. Many of the “key” used together, can activate the “cancer procedures”, “key” more, the greater the opportunity to start.
We are also unable to resolve all “key” and therefore can not overcome the cancer.
Tumor cells from “renegade” derived from normal cells, after many years before they grow into tumors. “Mutiny” on track cells from their own set proliferation rate, accumulated to 1 billion more than we can detect. The rate of cancer cell proliferation by doubling time, a change two, two variable four, and so on. For example, gastric cancer, colorectal cancer, liver cancer, pancreatic cancer, esophageal cancer in the average doubling time is 33 days; breast cancer doubling time is more than 40 days. Because cancer cells constantly doubled, to more advanced cancers progress faster.
Issue three: how cancer metastasis
“Cancer is very ‘greed’.” Said Academician Sun, it will go to it may reach anywhere, and the main path has three: the first general lymph node metastasis, tumor resection, lymph node dissection should be carried out; radiotherapy Apart from the primary tumor irradiation lesions but also the surrounding lymph node irradiation. is the ideal cancer metastasis and preferred channel. Lymph node metastasis from near and far are often, such as breast cancer first transferred to the ipsilateral axillary lymph nodes, followed transferred to the clavicle, under the lymph nodes, or contralateral axillary lymph nodes. Direct invasive vascular or lymphatic vessels enter the cancer cells, the blood flow will reach the other parts such as the lung, brain, liver and bone, and so on, and this is blood metastasis. Often gastrointestinal cancer metastasis to the liver and lung, breast, renal cell carcinoma, osteosarcoma, and so often transferred to the lungs, lung cancer easily transferred to the brain, prostate cancer metastasis to the bone easily. Chemotherapy is to avoid any cancer cells through the blood transfer, and use “along the way” to destroy the cancer cells.
There is a relatively small transfer, the transfer is growing. If tumor cells from the surface off, “lose” in pleural, peritoneal cavity and other places, the spinal cord and brain, it will “take root.” These generally took place in the lower part of the cavity, such as the rib phrenic Kok, rectal bladder Waterloo, skull base and other places.
Ordinary people love to say what carcinogen, in fact, we can not say what will not eat as long as a cancer, or what will be in contact with cancer. We have not found any of the factors inducing cancer is the inevitable factors. Overcoming cancer is the most important early discovery, early cancer can be cured most. To this end, we must, first, regular medical check-ups, and the second is uncomfortable to a doctor. Some symptoms may be related to cancer, not to feel pain before to see a doctor.
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