Non-Small Cell Lung Cancer

What is Non-Small Cell Lung Cancer?

Non-small cell lung cancer is the most common type of lung cancer. It accounts for about 85% of all lung cancer cases. This cancer starts when cells in the lungs begin to grow out of control and form tumors.

The term non-small cell refers to how the cancer cells look under a microscope. These cells are larger than the cells found in small cell lung cancer. Non-small cell lung cancer grows more slowly than small cell types. It includes several subtypes such as adenocarcinoma, squamous cell carcinoma, and large cell carcinoma.

Some non-small cell lung cancers have specific genetic mutations that drive their growth. One of these is the BRAF mutation. Finding these mutations helps doctors choose the most effective targeted therapies. Early detection and understanding your cancer's genetic profile can significantly improve treatment outcomes.

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Symptoms

Persistent cough that does not go away or gets worse over time
Coughing up blood or rust-colored phlegm
Chest pain that worsens with deep breathing, coughing, or laughing
Shortness of breath or wheezing
Hoarseness or changes in voice
Unexplained weight loss and loss of appetite
Feeling tired or weak without clear reason
Repeated respiratory infections like bronchitis or pneumonia
Bone pain if cancer has spread
Headaches or neurological symptoms if cancer has spread to the brain

Many people with early-stage non-small cell lung cancer have no symptoms at all. This is why the cancer is often found at later stages. Some symptoms may seem minor at first and are easily dismissed.

Causes and risk factors

Smoking is the leading cause of non-small cell lung cancer. About 80% to 90% of lung cancer cases are linked to cigarette smoking. Tobacco smoke contains more than 7,000 chemicals, and many are known to cause cancer. Even exposure to secondhand smoke increases your risk. The longer and more heavily someone smokes, the greater their risk becomes.

Other risk factors include exposure to radon gas, asbestos, and air pollution. Family history of lung cancer can also increase risk. Some people develop lung cancer without any known risk factors. Certain genetic mutations like BRAF can occur randomly and drive cancer growth. Age is another factor, as most people diagnosed are 65 or older.

How it's diagnosed

Diagnosis of non-small cell lung cancer typically begins with imaging tests. Chest X-rays and CT scans can reveal abnormal masses or nodules in the lungs. If something suspicious is found, doctors will perform a biopsy. This involves taking a small sample of tissue to examine under a microscope.

Once cancer is confirmed, genetic testing of the tumor tissue is critical. Tests like BRAF mutation analysis help identify specific genetic changes in the cancer cells. These specialized tests require tumor samples and are typically ordered by an oncologist. Talk to a doctor about genetic testing options if you have been diagnosed with lung cancer. Understanding your cancer's genetic profile helps guide personalized treatment decisions.

Treatment options

Surgery to remove tumors in early-stage cancer
Radiation therapy to target cancer cells with high-energy beams
Chemotherapy using drugs that kill rapidly dividing cells
Targeted therapy drugs for cancers with specific mutations like BRAF
Immunotherapy to help your immune system recognize and attack cancer cells
Quitting smoking immediately to improve treatment outcomes and overall health
Eating a nutrient-dense diet to support your body during treatment
Staying as physically active as possible to maintain strength
Working with a multidisciplinary oncology team for coordinated care
Joining support groups to connect with others facing similar challenges

Frequently asked questions

The main difference is how the cancer cells look under a microscope and how they behave. Non-small cell lung cancer cells are larger and generally grow more slowly. Small cell lung cancer is more aggressive and spreads more quickly. Non-small cell lung cancer is much more common, accounting for about 85% of cases.

Yes, non-smokers can develop non-small cell lung cancer. About 10% to 20% of lung cancer cases occur in people who never smoked. Risk factors for non-smokers include secondhand smoke, radon exposure, air pollution, and genetic factors. Some lung cancers develop without any identifiable risk factors.

BRAF is a gene that helps control cell growth. When this gene mutates, it can cause cells to grow uncontrollably and form cancer. About 1% to 3% of non-small cell lung cancers have BRAF mutations. Knowing if your cancer has this mutation is important because specific targeted therapy drugs can block the abnormal BRAF protein.

Doctors use a staging system from 0 to 4 to describe how advanced the cancer is. Stage 0 and 1 are early cancers confined to the lung. Stages 2 and 3 mean the cancer has spread to nearby lymph nodes or tissues. Stage 4 means the cancer has spread to distant organs. Staging helps determine the best treatment approach.

Targeted therapies are drugs that attack specific genetic changes in cancer cells. They work differently than chemotherapy, which affects all rapidly dividing cells. For cancers with BRAF mutations, drugs like dabrafenib and trametinib can specifically target the abnormal protein. These treatments often have fewer side effects than traditional chemotherapy.

If you are between 50 and 80 years old and have a 20 pack-year smoking history, annual screening is recommended. A pack-year means smoking one pack per day for one year. Current smokers and those who quit within the past 15 years should discuss screening with their doctor. Low-dose CT scans are the standard screening method.

Yes, lifestyle changes can support your body during treatment and improve outcomes. Quitting smoking immediately is the most important step. Eating a balanced diet with plenty of protein helps maintain strength. Regular light exercise, when approved by your doctor, can reduce fatigue and improve mood.

Survival rates depend heavily on the stage at diagnosis. For localized cancer that has not spread, the 5-year survival rate is about 64%. For cancer that has spread to nearby areas, it drops to about 37%. For distant metastatic cancer, the rate is about 8%. These numbers continue to improve with new treatments.

Yes, genetic testing of your tumor is now standard care for non-small cell lung cancer. This testing looks for mutations like BRAF, EGFR, ALK, and others that can be targeted with specific drugs. Your oncologist will order these tests on your biopsy sample. Results typically take 1 to 2 weeks and guide your treatment plan.

Not smoking is the single most effective way to prevent lung cancer. If you smoke, quitting at any age reduces your risk significantly. Avoiding secondhand smoke and testing your home for radon are also important. Reducing exposure to air pollution and workplace carcinogens like asbestos can lower risk as well.