There have been many reasons that scholars have exposed as sources for individual cancers we know, but if there is a highly responsible culture of prevention, we can hardly deal with this scourge of mankind.

Elements such as snuff and alcohol, as well as those used in industry such as asbestos, arsenic, aromatic amines, benzene, vinyl chloride, chromium, some antitumor antibiotics, soot, tar, products shoemaking and furniture, among others, are responsible for many types of cancer, as has been shown scientifically.

Provided a diet of excess fat, alcohol, and the decrease of antioxidants and fiber daily diets, some techniques for preserving foods with nitrates, smoked, salted or pickled, are also factors in many cases, to the cancer.

Radiation are other causes of cancer, especially for people living exposed to them, such as the doctors themselves, who have been affected by nuclear explosions or for patients who have required frequent passing radiology. It should be noted that ultimately exposure to the sun are also considered highly dangerous and generating skin cancer.

And finally, we have that type of cancer that arises as a result of a virus in some tumors, such as papillomavirus, Epstein-Barr virus, nasopharyngeal carcinoma, Hodgkin’s disease, supraglottic laryngeal carcinoma and carcinoma thymic. The same thing happens with herpes virus family called HHV-8 virus, hepatitis B and HTLV-1 retrovirus that causes leukemia.

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• Step hidden. Cancer cells are found in sputum, but you can not find any tumor in the lung.
• Stage 0. The cancer is localized in one area, in some cell layers only, and no growth through the lining of the lung. Another term for this type of lung cancer is “carcinoma in situ.”
• Stage I. The cancer is found only in the lung and is surrounded by normal tissue. * Stage II The cancer has spread to nearby lymph nodes.
• Stage III. The cancer has spread to the chest wall or diaphragm near the lung, or the cancer has spread to lymph nodes in the area that separates the two lungs (mediastinum) lymph nodes or across the chest, or neck.
• Stage IV. The cancer has spread to other parts of the body. Recurrent cancer has returned after being treated.

In the classification of lung cancer small cell stage talks that follow:

• Limited Stage Cancer is found only in one lung and nearby lymph nodes.
• Extensive Stage Cancer has spread outside the lung where it originated to other tissues of the chest or other body parts.
• Step appellant. The disease has recurred after being treated, whether in the lungs or other body part.
• Step appellant. The disease has recurred after being treated, whether in the lungs or other body part.

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