What small cell lung cancer is
Small cell lung cancer (SCLC) is a type of lung cancer that starts in the cells lining the airways of the lungs. It is called "small cell" because the cancer cells are small and round when viewed under a microscope. This type of cancer grows quickly and spreads to other parts of the body faster than the more common type of lung cancer, called non-small cell lung cancer.
Small cell lung cancer accounts for about 15 percent of all lung cancers. It is almost always linked to smoking, though people who have never smoked can develop it. The cancer typically starts in the central airways of the lungs, near the middle of the chest, rather than at the outer edges.
Key Takeaways
- Small cell lung cancer is a fast-growing cancer that starts in the cells lining the airways and spreads quickly to other organs.
- Doctors identify it using imaging tests like CT scans, followed by a biopsy to confirm the diagnosis under a microscope.
- Staging determines how far the cancer has spread and guides what treatment options are available.
- Treatment usually involves chemotherapy, radiation, or a combination of both, depending on the stage and the person's overall health.
- Talking with your doctor about what to expect at each step helps you prepare for appointments and make decisions about your care.
How doctors find small cell lung cancer
Doctors often discover small cell lung cancer when a person comes in with symptoms like a persistent cough, chest pain, or shortness of breath. The first step is usually a chest X-ray, which can show a mass or abnormal area in the lungs. If the X-ray looks suspicious, the doctor will order a CT scan (computed tomography), which takes detailed cross-section images of the chest and can show the size and location of the tumor more clearly.
To confirm the diagnosis, a doctor needs to look at the actual cancer cells. This is done through a biopsy, where a small sample of tissue is removed and examined under a microscope. A biopsy can be performed in several ways: a bronchoscopy (a thin tube with a camera passed down the windpipe), a needle biopsy (a needle inserted through the chest wall), or a biopsy during surgery. The pathologist (a doctor who studies tissue samples) will confirm whether the cells are small cell lung cancer and rule out other types.
Once the diagnosis is confirmed, additional tests help determine how far the cancer has spread. These may include a PET scan (positron emission tomography), which shows areas of high activity in the body, and blood tests. An MRI of the brain is often done because small cell lung cancer frequently spreads to the brain.
Staging: Understanding how far the cancer has spread
Staging tells you and your doctor how advanced the cancer is. Small cell lung cancer uses a simpler staging system than some other cancers. It is divided into two main stages: limited stage and extensive stage.
Limited stage means the cancer is found only in one lung and the lymph nodes on the same side of the chest. It has not spread to the other lung, the opposite side of the chest, or distant organs. Extensive stage means the cancer has spread beyond one lung and its nearby lymph nodes—it may be in both lungs, the opposite side of the chest, or distant organs like the brain, liver, or bones.
Your doctor will use the results of your imaging tests and biopsy to determine your stage. This information is crucial because it affects which treatments are recommended and what the outlook might be. Limited stage cancers have a better outlook than extensive stage, though both are serious and require prompt treatment.
Symptoms that may lead to diagnosis
Many people with small cell lung cancer do not have symptoms in the early stages. When symptoms do appear, they often develop over weeks or months. Common symptoms include a cough that does not go away, chest pain or discomfort, shortness of breath, and hoarseness in the voice.
Some people experience symptoms related to where the cancer has spread. If it has spread to the brain, there may be headaches, dizziness, or balance problems. If it has spread to the bones, there may be bone pain. If it has spread to the liver, there may be yellowing of the skin or eyes. These symptoms should be reported to your doctor right away, as they can help guide further testing.
It is important to know that having these symptoms does not mean you have small cell lung cancer—many other conditions cause the same symptoms. Only imaging tests and a biopsy can confirm the diagnosis.
Risk factors and who gets small cell lung cancer
Smoking is the strongest risk factor for small cell lung cancer. About 95 percent of people diagnosed with this cancer have a history of smoking. The longer someone smokes and the more cigarettes they smoke, the higher the risk. Former smokers also have an increased risk, even years after quitting.
People who have never smoked can develop small cell lung cancer, though it is less common. Exposure to secondhand smoke, radon gas, asbestos, or air pollution may increase the risk. Having a family history of lung cancer or a personal history of other cancers can also raise the risk.
Small cell lung cancer can develop at any age but is most common in people over 65. It affects men and women, though historically it has been more common in men because smoking rates were higher among men.
What happens after diagnosis
After your doctor confirms small cell lung cancer and determines the stage, you will meet with an oncologist (a doctor who specializes in cancer treatment). The oncologist will discuss treatment options based on your stage, overall health, and personal preferences. Most people with small cell lung cancer receive chemotherapy, often combined with radiation therapy. Some newer treatments, called immunotherapies, may be recommended in certain situations.
Your treatment plan will be tailored to you. Limited stage cancer is often treated more aggressively because there is a better chance of controlling it. Extensive stage cancer treatment focuses on controlling symptoms and slowing the cancer's growth. Your doctor will explain what each treatment involves, what side effects to expect, and how often you will need appointments.
Throughout treatment, you will have regular follow-up visits and imaging tests to see how the cancer is responding. These appointments are also a time to discuss any side effects or concerns. Having a support system—whether family, friends, or support groups—can be helpful during this time.
Frequently Asked Questions
Is small cell lung cancer curable?
Small cell lung cancer is difficult to cure, but treatment can control it and extend survival. Limited stage cancer has a better outlook than extensive stage. Some people go into remission, meaning the cancer is no longer detectable. Your doctor can discuss what remission and survival rates mean for your specific situation.
What is the difference between small cell and non-small cell lung cancer?
Small cell lung cancer grows and spreads faster than non-small cell lung cancer, which is more common. Treatment approaches differ: small cell cancer typically responds well to chemotherapy and radiation, while non-small cell cancer may be treated with surgery, targeted drugs, or immunotherapy. The prognosis and treatment options are different for each type.
Can small cell lung cancer be prevented?
Not smoking is the best way to reduce the risk of small cell lung cancer. If you smoke, quitting at any age lowers your risk. Avoiding secondhand smoke, radon, and asbestos also helps. People with a strong family history of lung cancer should talk with their doctor about screening options.
Will I need surgery to treat small cell lung cancer?
Surgery is rarely used for small cell lung cancer because the cancer usually has already spread by the time it is found. Treatment typically focuses on chemotherapy and radiation. In rare cases where the cancer is found very early and is only in one lung, surgery may be considered as part of the treatment plan.
How often will I have appointments during treatment?
During active treatment, appointments are usually weekly or every other week for chemotherapy or radiation. Your doctor will schedule imaging tests every few weeks or months to monitor how the cancer is responding. After treatment ends, follow-up visits continue regularly to watch for recurrence and manage any long-term effects.