Small cell lung cancer
What is Small cell lung cancer?
Small cell lung cancer is an aggressive type of lung cancer that grows and spreads quickly. It makes up about 10 to 15 percent of all lung cancers. This cancer starts in the bronchi, the large airways in the center of your lungs. It gets its name from how the cancer cells look under a microscope.
Small cell lung cancer is classified as a neuroendocrine tumor. This means it develops from cells that release hormones into your bloodstream. These cancer cells can produce substances like chromogranin A, which doctors can measure through blood tests. Because this cancer spreads rapidly, it often reaches other parts of the body before symptoms appear.
Most people with small cell lung cancer have a history of cigarette smoking. The cancer is strongly linked to tobacco use. Early detection is difficult because symptoms often do not show until the disease has progressed. Treatment usually involves chemotherapy and radiation, and outcomes depend heavily on how far the cancer has spread at diagnosis.
Symptoms
- Persistent cough that gets worse over time
- Chest pain that gets worse with deep breathing or coughing
- Shortness of breath or wheezing
- Coughing up blood or rust-colored phlegm
- Hoarseness or voice changes
- Unexplained weight loss and loss of appetite
- Feeling very tired or weak
- Repeated lung infections like pneumonia or bronchitis
- Swelling in the face or neck
- Difficulty swallowing
Many people with small cell lung cancer have no symptoms in the early stages. By the time symptoms appear, the cancer has often already spread beyond the lungs. Some people experience symptoms related to where the cancer has spread, such as bone pain, headaches, or neurological changes.
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Causes and risk factors
Cigarette smoking causes about 95 percent of small cell lung cancer cases. The risk increases with the number of cigarettes smoked per day and the number of years smoking. Secondhand smoke exposure also raises your risk, though to a lesser degree. People who quit smoking reduce their risk over time, but former smokers still have higher risk than those who never smoked.
Other risk factors include exposure to radon gas, asbestos, arsenic, and other workplace chemicals. Radiation exposure to the chest from previous cancer treatment can increase risk. Family history of lung cancer may play a small role. However, tobacco use remains the dominant cause. Most people diagnosed with this cancer are current or former smokers between ages 60 and 80.
How it's diagnosed
Doctors diagnose small cell lung cancer through imaging tests and tissue samples. A chest X-ray or CT scan can reveal abnormal masses in the lungs. If cancer is suspected, a biopsy removes a small tissue sample for examination under a microscope. This confirms whether cancer cells are present and identifies the specific type.
Blood tests can support diagnosis and monitoring but cannot diagnose cancer on their own. Chromogranin A is a biomarker that may be elevated in small cell lung cancer because it is a neuroendocrine tumor. Doctors use this test to track how well treatment is working and to watch for cancer recurrence. Additional staging tests determine whether the cancer has spread to lymph nodes, other organs, or bones. Talk to your doctor about appropriate testing for your situation.
Treatment options
- Chemotherapy is the primary treatment and often combined with radiation therapy
- Radiation therapy targets cancer cells in the chest and brain
- Immunotherapy medications help your immune system fight cancer cells
- Surgery is rarely an option because the cancer usually spreads early
- Quitting smoking improves treatment outcomes and overall health
- Eating nutrient-dense foods helps maintain strength during treatment
- Physical activity as tolerated can improve energy and mood
- Palliative care manages symptoms and improves quality of life
- Clinical trials may offer access to new treatment approaches
Frequently asked questions
Small cell lung cancer grows and spreads much faster than non-small cell lung cancer. It makes up about 10 to 15 percent of lung cancers, while non-small cell accounts for most cases. Small cell lung cancer is more likely to have spread by the time of diagnosis. Treatment approaches differ significantly between the two types.
Blood tests alone cannot diagnose small cell lung cancer. A tissue biopsy is required for diagnosis. However, blood tests like chromogranin A can help monitor the cancer after diagnosis. Elevated chromogranin A levels may indicate active disease or recurrence after treatment.
Small cell lung cancer is a neuroendocrine tumor that produces hormones and proteins. Chromogranin A is one of these proteins released by cancer cells. As the cancer grows or becomes more active, chromogranin A levels in the blood typically increase. Levels often decrease when treatment is working effectively.
Small cell lung cancer is one of the fastest-growing cancers. It can double in size in as little as 30 days. By the time symptoms appear, the cancer has often already spread to lymph nodes or distant organs. This rapid growth makes early detection extremely difficult.
Survival depends on whether the cancer is limited to one area or has spread widely. For limited-stage disease, about 25 to 30 percent of people survive 5 years. For extensive-stage disease, 5-year survival is about 3 percent. Early detection and prompt treatment improve outcomes significantly.
Not smoking is the most important prevention step since smoking causes 95 percent of cases. If you smoke, quitting at any age reduces your risk over time. Avoiding secondhand smoke and workplace carcinogens like asbestos also helps. Testing your home for radon gas can identify another preventable risk factor.
Doctors measure chromogranin A before treatment starts to establish a baseline level. They recheck it during and after treatment to see if levels are dropping. Rising levels may signal that cancer is growing or returning. This helps doctors adjust treatment plans and catch recurrence early.
Bone pain may indicate spread to the skeleton. Severe headaches, vision changes, or seizures suggest brain involvement. Jaundice or abdominal pain can mean liver spread. Swelling in the neck and face, called superior vena cava syndrome, occurs when tumors block blood flow.
Annual low-dose CT scans are recommended for adults aged 50 to 80 with a 20 pack-year smoking history. This includes current smokers and those who quit within the past 15 years. Screening can detect lung cancer early when it is more treatable. Talk to your doctor about whether screening is right for you.
Quitting smoking immediately improves treatment effectiveness and reduces complications. Eating well helps maintain strength during chemotherapy and radiation. Staying as active as possible supports physical and mental health. Managing stress and getting support from loved ones or counselors also matters for quality of life.