Lung Cancer Causes
being has two lungs, one at left and the other one at right. They are located on the diaphragm and protected by
the ribcage. The left lung is divided into two lobes; the right lung has three lobes, which makes it larger and
heavier. All these lung tissues are formed by a group of cells that allow the exchange of vital gases, oxygen
and carbon dioxide. At every moment, thousands of cells naturally die to be replaced by new healthy cells. Lung
cancer occurs when a group of cells refuses to die and begin to multiply uncontrollably to form malignant growth
in the tissue of the lungs.
Smoking is the leading
cause of small cell lung cancer. It is responsible for about 90% of lung cancers among men and 78% among women.
It is estimated that nearly 98% of small cell lung cancer patients have a smoking history. In addition to direct
use of tobacco, being frequently exposed to secondhand smoke or carcinogenic particles in the air - asbestos,
radon gas, gasoline, etc. - can also cause small cell lung cancer.
Once inhaled, toxins
contained in tobacco smoke (including secondhand smoke or passive smoke) accumulate in the lungs and begin their
degenerative effects, slowly and sometimes asymptomatically. When symptoms finally emerge, the tumor is already
very advanced. Approximately 65-70% of patients with small cell lung cancer have an extensive malignant tumor at
diagnosis. In general, extensive-stage small-cell lung cancers are incurable; they kill their victims within 12
months after diagnosis.
Small Cell Lung Cancer
Small Cell Lung Cancer Risk Factors