Several types of non-small cell lung cancer may occur. Three of the subtypes make up most of the cases of lung cancer. A few additional rare subtypes also exist. While each subtype differs, many of the treatment options are the same.
The two main types of lung cancer include small cell and non-small cell. Non-small cell lung cancer is a form of cancer that starts in the epithelial cells of the lungs.
According to the American Cancer Society,
Non-small cell lung cancer (NSCLC) is further divided into subtypes. The specific type of lung cells that the cancer develops from determines the subtype. Treatment and prognosis for each subtype may vary, also depending on the stage of the disease at diagnosis.
The article below takes a look at the different subtypes, including their treatment options and prognosis.
Adenocarcinoma is the most common form of lung cancer. According to 2016 research, about
This subtype of NSCLC typically starts in the outer part of the lung in type 2 alveolar cells. Although it mostly occurs in people who smoke, it is also the most common form of lung cancer in nonsmokers.
According to the
Treatment for adenocarcinoma varies depending on the stage. Treatment may include:
- radiation therapy
- targeted therapy (medication that attacks specific gene mutations)
The prognosis for adenocarcinoma depends on the stage. However, various factors play a role in prognosis, including:
- the stage of disease
- other health issues
Squamous cell carcinoma occurs in about
Large cell undifferentiated carcinoma usually starts in the central portion of the lung. It is the third most common form of NSCLC and accounts for about
Large cell undifferentiated carcinoma often involves fast-growing cells and may quickly spread to:
- nearby lymph nodes
- the chest wall
- distant organs
Treatment typically involves chemotherapy and radiation therapy. Surgery is also an option in some cases.
Adenosquamous carcinoma is a rare subtype of NSCLC. This form of lung cancer has features of both squamous cell carcinoma and adenocarcinoma. Adenosquamous carcinoma only accounts for about
Although it can affect females, it typically occurs in males. Most people diagnosed have a smoking history. Surgery is the most common treatment, but adenosquamous carcinoma is aggressive, and the prognosis is poor.
Lung sarcomatoid is also a rare subtype of lung cancer. It accounts for only about
Treatment may include surgery in the early stages and chemotherapy in advanced disease. Sarcomatoid has a poor prognosis when compared with other subtypes of NSCLC, even in the early stage of the disease.
Salivary gland-type tumors in the lung generally start in the submucosal glands in the central airways. Salivary gland carcinoma is a rare form of lung cancer.
Compared with other subtypes of NSCLC, salivary gland carcinoma usually occurs in people who are younger. It is a slow-growing tumor, which improves prognosis.
Typically, surgery is the main treatment without the need for additional chemotherapy or adjunct therapy. Prognosis depends on several factors, including the stage of the cancer, the person’s age, and whether they have any other health issues.
Carcinoid tumors start in neuroendocrine cells, which are a type of cell in the lungs. Neuroendocrine cells help control the growth of other lung cells, as well as control the flow of blood and air into the lungs.
There are two types of carcinoid tumor: typical and atypical. Typical carcinoid tumors grow slowly and are unlikely to grow beyond the lungs. The
Carcinoid tumors only account for about
The prognosis is good for people with this form of lung cancer. The 5-year survival rate is about
In some cases, doctors cannot determine the specific subtype of NSCLC.
For example, in about
People will need to contact a doctor if they experience any symptoms of lung cancer. Many symptoms may be a sign of another condition, but it is important to find out the underlying cause.
Diagnosing lung cancer at an earlier stage
Common symptoms of the disease include:
- a cough that is persistent or worsens
- chest pain that worsens with coughing, laughing, or deep breathing
- coughing up blood or rust-colored spit or phlegm
- hoarse voice
- shortness of breath
- new onset of wheezing
- loss of appetite
- unintentional weight loss
- tiredness or weakness
- persistent infections, such as bronchitis or pneumonia
To diagnose NSCLC, a doctor may carry out various tests, such as:
- a physical exam to check for any unusual signs and symptoms
- a medical history, including previous jobs, smoking habits, or illnesses
- blood tests, urine tests, and tissue samples for laboratory testing
- a chest X-ray
- a CT scan
- a sputum cytology, which examines mucus from the lungs under a microscope to look for cancer cells
- a thoracentesis, which takes a fluid sample from the area between the chest and the lungs for laboratory testing
These tests may also help doctors to diagnose the type and stage of NSCLC.
The two main types of lung cancer include small cell and non-small cell lung cancer. NSCLC is further broken down into subtypes. The subtypes have similar treatment options. However, the specifics, such as what part of the lung cancer develops, may vary.
The prognosis for most subtypes of NSCLC depends on what stage the disease is in at diagnosis. The earlier the stage, the better the prognosis.
For example, people with localized NSCLC have about a 60% 5-year survival rate, according to the