Lung Cancer - Describe Your Experience

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What is lung cancer?

Cancer of the lung, like all cancers, results from an abnormality in the body's basic unit of life, the cell. Normally, the body maintains a system of checks and balances on cell growth so that cells divide to produce new cells only when new cells are needed. Disruption of this system of checks and balances on cell growth results in an uncontrolled division and proliferation of cells that eventually forms a mass known as a tumor.

Tumors can be benign or malignant; when we speak of "cancer," we are referring to those tumors that are malignant. Benign tumors usually can be removed and do not spread to other parts of the body. Malignant tumors, on the other hand, grow aggressively and invade other tissues of the body, allowing entry of tumor cells into the bloodstream or lymphatic system and then to other sites in the body. This process of spread is termed metastasis; the areas of tumor growth at these distant sites are called metastases. Since lung cancer tends to spread or metastasize very early after it forms, it is a very life-threatening cancer and one of the most difficult cancers to treat. While lung cancer can spread to any organ in the body, certain locations -- particularly the adrenal glands, liver, brain, and bones -- are the most common sites for lung cancer metastasis.

The lung also is a very common site for metastasis from tumors in other parts of the body. Tumor metastases are made up of the same type of cells as the original (primary) tumor. For example, if prostate cancer spreads via the bloodstream to the lungs, it is metastatic prostate cancer in the lung and is not lung cancer.

The principal function of the lungs is to exchange gases between the air we breathe and the blood. Through the lung, carbon dioxide is removed from the bloodstream and oxygen from inspired air enters the bloodstream. The right lung has three lobes, while the left lung is divided into two lobes and a small structure called the lingula that is the equivalent of the middle lobe on the right. The major airways entering the lungs are the bronchi, which arise from the trachea. The bronchi branch into progressively smaller airways called bronchioles that end in tiny sacs known as alveoli where gas exchange occurs. The lungs and chest wall are covered with a thin layer of tissue called the pleura.

Lung cancer picture

Picture of lung cancer.
Picture of lung cancer.

Lung cancers can arise in any part of the lung, but 90% to 95% of cancers of the lung are thought to arise from the epithelial cells, the cells lining the larger and smaller airways (bronchi and bronchioles); for this reason, lung cancers are sometimes called bronchogenic cancers or bronchogenic carcinomas. (Carcinoma is another term for cancer.) Cancers also can arise from the pleura (called mesotheliomas) or rarely from supporting tissues within the lungs, for example, the blood vessels.

Return to Lung Cancer

See what others are saying

Comment from: Ramanamurthy, 55-64 Male (Patient) Published: September 01

I was diagnosed with tumor in left lung in 2013. In the first two biopsy reports a negative result came for malignancy. Thereafter in an advanced biopsy report positive result came. Since then I have undergone 6 chemotherapy and 36 radiation sittings which resulted in decrease in size of tumor. However, after 3 months there was an increase of 3 mm in size and also accumulated pleural fluid. This fluid was tapped out and in biopsy result was positive for malignant cells. Again I was advised for 6 chemotherapy treatments, out of which 3rd chemotherapy is scheduled tomorrow. The side effects I could not bear, I prefer to have an end of my life. This is not to discourage any one, but just my feeling.

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Comment from: karen, 55-64 Female (Patient) Published: October 06

I went to the doctor because I had no appetite. X-ray showed 2 little spots on top right lobe. Doctor didn't think it was cancer but went in, and had right lobe removed because it was cancer. It was so small, so no chemotherapy or radiation. That was almost 4 1\2 years ago. I am still cancer free far as I know. I don't have many tests run, guess they think it has gone.

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