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The pathophysiology of lung cancer development is complicated and incompletely understood. The genes influenced in the pathogenesis of the cancer generate proteins involved in cell development and differentiation, apoptosis, tumor progression, cell cycle processes, angiogenesis, and immune regulation. Exposing these mechanisms ought to translate into novel means of risk stratification, early detection, prevention, and therapy.
The cancers are in general divided into small cell (SCLC) and non-small cell lung cancer (NSCLC).
Small cell lung cancer responds to radiotherapy and chemotherapy, and for that reason the treatment is extremely different from the other types. Malignant tumors arise most generally in response to repetitive carcinogenic stimuli, inflammation, or irritation. The mucosal lining is the most susceptible to injury, particularly at locations of bronchial bifurcation. The slow alteration of normal mucosal cells into malignant cells is a complex course.
Non-small cell lung cancer accounts for about 85% of all cancers of lung. It is divided further into squamous cell carcinoma, adenocarcinoma, and large cell carcinoma histologies. All of them share identical treatment methods and prognoses but have different histologic and clinical characteristics.
Cigarette smoking is accounts for about 30% of all cancer deaths. Particularly for case of cancer of lung, smoking is high risk to expand the disease. It is about 85% of the cases of cancer of lung in men and 75% in women caused by smoking. There are approximately 38 million former cigarette smokers and roughly 50 million smokers in the United States nowadays.
To explain about how mechanisms pathophysiology of cancers of lung course occurred, perhaps it will be more than one book.
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Treatment for non-small cell lung cancer (NSCLC) is usually successful when the disease is caught in its earliest stages. It remains localized in the lungs, and can be removed via surgery. Depending on its location and the extent of lung tissue that has been affected, a surgeon can perform a wedge resection, lobectomy, or pneumonectomy. Unfortunately, a large percentage of cases are not detected until the disease has spread beyond the lungs. This is a process known as metastasis. Once it occurs, surgery alone is inadequate for curing the condition.
In this article, we’ll explain how lung cancer spreads to other areas of the body. You’ll learn about the treatment options doctors use to resolve the disease along the way.
The Beginning Of Metastasis
With NSCLC, tumors are composed of cancerous cells. These cells eventually break away from the tumor, and travel to other parts of the body. They can do so through the lymphatic system (a part of the immune system), or through the patient’s bloodstream.
When lung cancer is discussed in the context of the lung, it is referred to as a primary tumor or primary cancer. When it is discussed in the context of areas outside the lungs, it is called a secondary cancer. For instance, if NSCLC has spread to the brain, a surgeon may refer to it as “brain cancer secondary to the lung” rather than “brain cancer.” This addresses the fact that metastasis has occurred, and indicates the original site of the disease.
When Cancer Cells Spread To The Lymph Nodes
The first place to which lung cancer cells migrate is the lymph nodes. The cells are delivered through the lymphatic system. In many cases, this does not necessarily constitute metastasis since the cells can migrate during the early stages of the disease. Once the cancer cells have reached the lymph nodes, however, they can spread further to other areas of the chest.
This spread is rarely caught by doctors since it is often absent of symptoms. When NSCLC is detected in the lymph nodes, chemotherapy is typically used to treat it.
Lung Cancer In The Bone
Metastasis to the bone is common, and affects an estimated four out of ten people with late stage NSCLC. While the disease can spread to bone anywhere throughout the body, common sites include the upper legs, pelvis, and spine. The patient will experience pain, which worsens as the disease advances. It is common for people to mistake the pain for mild sports injuries, such as muscle strains.
By the time lung cancer has reached the bone, it has progressed to the point that treatment focuses on relieving symptoms rather than curing the disease. Radiation therapy is usually the treatment option of choice. The patient will also receive medications to help minimize the pain.
When The Disease Reaches The Brain
Many people who suffer from late stage lung cancer will also experience metastasis to the brain. This can cause several side effects, including headaches, seizures, and a loss of coordination. Symptoms of NSCLC that has reached the brain are similar to the side effects of a stroke.
Treatment may encompass several options, including surgery, chemotherapy, and stereotactic radiotherapy. This latter option involves delivering a high dose of radiation to specific parts of the brain tissue.
Cancer Cells In The Liver
Often detected by accident, NSCLC in the liver represents a late-stage advance of the disease. By the time cancer cells have reached the liver, the condition is usually deemed at stage 4. It often produces no symptoms other than those from which the patient already suffers. Other times, the patient may feel nausea and pain under the ribs.
As with NSCLC that has spread to the bone, treatment for the disease in the liver has the goal of reducing symptoms. Surgery is rarely done at this stage.
Metastasis of cancer cells from the lungs to other parts of the body is an indication that surgery alone cannot cure the disease. If you suspect you may have NSCLC, consult your physician to discuss the most appropriate treatment options.
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admin on February 5th, 2012
