Cancer that begins in the lungs is known as lung cancer. Cancer arises when cells in the body begin to grow out of control. Lung cancer is a type of cancer that develops in the tissues of the lung, typically in the cells that line the airways. It is the leading cause of cancer death in both women and men. There are mainly two types: small cell lung cancer and non-small cell lung cancer. These two types are treated differently and grow differently. The most prevalent kind is non-small cell lung cancer.
Lung cancer is the prominent cause of cancer-related deaths worldwide, accounting for the highest mortality rates among both women and men. Approximately 85% of lung cancer cases are caused by smoking, making it the main risk factor. Lung cancer is frequently found in its advanced stages when there are few options for treatment. Primary prevention can lower the incidence of lung cancer and save lives through methods including tobacco control and limiting exposure to environmental risk factors. Dr. Sheetu Singh is the ideal choice for lung cancer care. Her tremendous experience and dedication to furthering the field of oncology give a great trust in her abilities to provide the best possible treatment and support.
Normal Structure and Function of the Lungs
Two sponge-like organs called lungs are located in the chest. In your right lung, there are three lobes. Your left lung has 2 Lobes. Due to the heart’s larger size on that side of the body, the left lung is smaller.
Air enters your mouth or nose during inhalation and passes down the trachea (windpipe) to your lungs. The Trachea divides into tubes called Bronchi, which enter the lungs and divide into smaller Bronchi. These separate into bronchioles, which are smaller branches. At the end of the bronchioles are tiny air sacs known as alveoli.
When you breathe in, the alveoli absorb oxygen into your blood and expel carbon dioxide when you exhale. The main function of the lungs is taking oxygen and getting rid of carbon dioxide. Most lung cancers develop from cells lining the bronchi and other areas of the lung, such as the bronchioles or alveoli.
A thin lining layer called the Pleura surrounds the lungs. The pleura shields your lungs and facilitates their back-and-forth motion against the chest wall as they expand and contract as you breathe. A narrow dome-shaped muscle called the Diaphragm separates the chest from the abdomen below the lungs. The diaphragm forces air into and out of the lungs as you breathe by rising and falling.
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Types of Lung Cancer
Lung cancer can be classified into two categories:
1. Non-small cell lung cancer (NSCLC): About 80% to 85% of lung cancers are NSCLC. The main subtypes of NSCLC are Squamous cell Carcinoma, Adenocarcinoma and large cell Carcinoma. Since their predictions and treatments are frequently similar, these subtypes which originate from several types of lung cells are categorized as NSCLC.
- Adenocarcinoma: Adenocarcinomas begin in the cells that would typically secrete substances like mucus.This type of lung cancer mostly affects smokers or former smokers, but it is also the most prevalent type of lung cancer detected in non-smokers. It is more common in women than in men and it is more likely to happen in younger people than other types of lung cancer.Adenocarcinoma is typically detected in the outer regions of the lung and is more likely to be discovered before it has spread. People who have adenocarcinoma in situ, also known as bronchioloalveolar carcinoma, a kind of adenocarcinoma, typically have a better prognosis than those who have other types of lung cancer.
- Squamous Cell Carcinoma: Squamous cell carcinomas develop from squamous cells, which are flat cells that coat the lining of the lung’s airways. They are frequently associated with a history of smoking and are typically located in the middle section of the lungs, near a major airway (bronchus).
- Large Cell Carcinoma: Large cell carcinoma can develop in any area of the lung. It tends to spread and grow quickly, which can make it harder to treat. A subtype of large cell carcinoma known as large cell neuroendocrine carcinoma (LCNEC) is a fast-growing malignancy that is remarkably similar to small cell lung cancer.
- Other Subtypes: A few other subtypes of NSCLC such as Sarcomatoid Carcinoma and Adenosquamous Carcinoma, are much less common.
2. Small Cell Lung Cancer (SCLC): Almost 10% to 15% of all lung cancers are SCLC. It is sometimes called Oat Cell cancer. Small cell lung cancer is classified into two types: small cell carcinoma and mixed small cell/large cell malignancy, sometimes known as combination small-cell lung cancer. The different varieties of small cell lung cancer are named after the types of cells detected in the tumor and how the cells appear under a microscope. Cigarette smoking is nearly always linked to small-cell lung cancer. Chemotherapy is typically used to treat small-cell lung cancer. This kind of lung cancer grows and spreads more quickly than NSCLC. When most persons with SCLC are diagnosed, the cancer has already progressed beyond the lungs. Since this cancer grows quickly, it tends to respond well to Radiation Therapy and Chemotherapy. Unfortunately, for the majority of patients, cancer will return at some point.
Other Types of Lung Tumors
Other tumors in the lungs can occur in addition to the major kinds of lung cancer.
- Lung Carcinoid Tumors: Carcinoid lung tumors account for less than 5% of all lung tumors. Most of these grow slowly.
- Other Lung Tumors: Other types of lung cancer such as Lymphomas, Adenoid Cystic Carcinoma and Sarcomas as well as lung tumors such as Hamartomas are rare.
- Cancers That Spread to the Lungs: Cancers that start in others (such as the pancreas, breast, skin or kidney) can sometimes spread (metastasize) to the lungs, but these are not lung cancers. For example, cancer that begins in the breast and circulates to the lungs is still considered breast cancer, not lung cancer. Treatment for Metastatic cancer in the lungs is based on where it started (the primary cancer site).


















































