The main cause of cancer deaths in women and men both in the United States and around the world. Lung cancer has surpassed breast cancer as the leading cause of cancer deaths in women. Only about 2% of those diagnosed with lung cancer that has spread to other areas of the body are alive five years after diagnosis, although the survival rate for lung cancer is diagnosed at an early stage higher, with approximately 49% survival for five years or more.
Cancer occurs when normal cells are undergoing a transformation that causes them to grow and multiply without control. The cells form a mass or tumor that differs from the surrounding tissue from which it emerged. Tumors are dangerous because they take oxygen, nutrients, and space from healthy cells and because they attack and destroy or reduce the ability of normal tissue function.
Lung tumors are the most ferocious. This means that they invade and destroy healthy tissue around them and can spread throughout the body.
Tumors can spread to nearby lymph nodes or through the bloodstream to other organs. This process is called metastasis.
When lung cancer metastasizes, the tumor in the lung called primary tumors, and tumors in other parts of the body are called secondary tumors or tumor metastases.
Some of the tumor in the lung are metastases of cancer elsewhere in the body. The lungs are common sites for metastasis. If this happens, the cancer is not considered to be lung cancer. For example, if prostate cancer spreads through the bloodstream to the lungs, it is the metastasis of prostate cancer (secondary cancer) in the lungs and is not called lung cancer.
Lung cancer consists of a bunch of different types of tumors. Lung cancer is usually divided into two main groups which account for about 95% of all cases.
The division into groups based on the type of cells that form of cancer.
Two main types of lung cancer characterized by the size of the tumor cells when viewed under a microscope. They are called cell lung cancer small (SCLC) and non-small cell lung cancer (NSCLC). NSCLC includes several subtypes of tumors.
SCLCs are less common, but they grow faster and are more likely to metastasize than NSCLCs. Often, SCLCs have spread to other parts of the body when cancer is diagnosed.
Approximately 5% of lung cancer is rare cell types, including carcinoid tumors, lymphomas, and others.Specific types of primary lung cancer were as follows:
Adenocarcinoma (an NSCLC) is the most common type of lung cancer, making 30% -40% of all cases. A subtype of adenocarcinoma is called bronchoalveolar cell carcinoma, which creates the appearance of pneumonia on chest X-rays.
Squamous cell carcinoma (an NSCLC) is the second most common type of lung cancer, making up about 30% of all cases.Large cancer cells (another NSCLC) formed 10% of all cases.
SCLC forms 20% of all cases.
Carcinoid tumors reached 1% of all cases. Common symptoms of lung cancer include
A cough that does not go away and gets worse over time
Constant chest pain
Coughing up blood
Shortness of breath, wheezing, or hoarseness
Repeated problems with pneumonia or bronchitis
Swelling of the neck and face
Loss of appetite or weight loss
fatigue
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