Non-Small Cell Lung Cancer: Symptoms, Causes and Treatment

Written by Medicover Team and Medically Reviewed by Dr Neelesh Kanderi , Oncologists

Non-small cell lung cancer (NSCLC) is a prevalent form of lung cancer, representing approximately 85% of all lung cancer cases. Understanding the diagnosis, types, causes, symptoms, treatment options, and prevention strategies of NSCLC is crucial for both patients and healthcare providers.

What Are the Types of Non Small Cell Lung Cancer?

NSCLC encompasses several subtypes, each with distinct characteristics and treatment responses.

Adenocarcinoma

Adenocarcinoma is the most common subtype, often found in the outer regions of the lung. It is more prevalent among non-smokers and tends to grow slower than other forms.

Squamous Cell Carcinoma

This subtype is typically linked to smoking and originates in the central part of the lungs or in the bronchial tubes. It is known for causing symptoms like coughing and breathing difficulties earlier in its development.

Large Cell Carcinoma

Large cell carcinoma is less common and can appear in any part of the lung. It is characterized by its rapid growth and spread, making it a more aggressive form of NSCLC.

What Are the Symptoms of Non Small Cell Lung Cancer?

The symptoms of NSCLC can vary significantly depending on the cancer's location, size, and spread. Common symptoms include:

Early detection of these symptoms can lead to earlier diagnosis and improved treatment outcomes.

What Causes Non Small Cell Lung Cancer?

Understanding the causes and risk factors associated with NSCLC is vital for both prevention and early detection.

Smoking

Smoking remains the leading cause of NSCLC, attributed to the carcinogens present in tobacco smoke. The risk increases with the number of cigarettes smoked and the duration of smoking.

Environmental and Occupational Exposures

Exposure to radon gas, asbestos, diesel exhaust, and other airborne pollutants can increase the risk of developing NSCLC. Individuals working in certain industries may be more susceptible due to these environmental factors.

Genetic Factors

Genetic predispositions can also play a role in the development of NSCLC. Mutations in specific genes, such as EGFR and ALK, have been associated with this cancer type, influencing both susceptibility and treatment options.

When Should You See a Doctor for Non Small Cell Lung Cancer?

Consult an oncologist if you experience persistent respiratory symptoms or are at high risk for lung cancer.

Early diagnosis can improve treatment options and increase the chances of successful outcomes.

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How Is Non Small Cell Lung Cancer Diagnosed?

The diagnosis of NSCLC typically involves a series of medical evaluations designed to confirm the presence of cancer and determine its extent. These evaluations often include imaging tests such as chest X-rays, CT scans, and PET scans, which help in visualizing abnormal growths in the lungs.

Biopsy Procedures

A definitive diagnosis of NSCLC is made through a biopsy, where a sample of lung tissue is extracted and examined microscopically. Various biopsy methods exist, including bronchoscopy, needle biopsy, and surgical biopsy, each chosen based on the tumor's location and size.

Staging the Cancer

Staging is a critical step in the diagnosis process, assessing how far the cancer has spread within the body. NSCLC is typically staged from I to IV, with Stage I being localized and Stage IV indicating metastasis. Accurate staging is essential for determining the most appropriate treatment plan.

How Is Non Small Cell Lung Cancer Treated?

Treatment for NSCLC is multifaceted, often involving a combination of surgery, radiation therapy, chemotherapy, targeted therapy, and immunotherapy.

Surgical Interventions

Surgery is a primary treatment option for early-stage NSCLC, aiming to remove the tumor and surrounding tissue. Options include lobectomy (removal of a lung lobe), pneumonectomy (removal of an entire lung), and wedge resection (removal of a small lung section).

Radiation Therapy

Radiation therapy uses high-energy rays to target and destroy cancer cells. It is often employed when surgery is not feasible or as an adjunct to surgical procedures to eradicate residual cancer cells.

Chemotherapy

Chemotherapy involves using drugs to kill cancer cells and is often used in conjunction with surgery or radiation therapy. It is particularly beneficial in treating advanced-stage NSCLC or when cancer has metastasized.

Targeted Therapy

Targeted therapies focus on specific genetic mutations found in cancer cells, such as EGFR or ALK mutations. These treatments are designed to block the growth and spread of cancer cells while minimizing damage to healthy cells.

Immunotherapy

Immunotherapy harnesses the body's immune system to fight cancer. Drugs such as checkpoint inhibitors have shown promise in treating NSCLC by helping the immune system recognize and attack cancer cells.

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Can Non Small Cell Lung Cancer Be Prevented?

Preventive measures play a crucial role in reducing the risk of developing NSCLC.

Smoking Cessation

The most effective prevention strategy is to avoid smoking or to quit smoking if already a smoker. Many resources are available to support smoking cessation, including counseling and medications.

Reducing Environmental Exposure

Minimizing exposure to known carcinogens, such as radon and asbestos, can significantly lower the risk of NSCLC. Ensuring proper ventilation and using protective equipment in occupational settings are essential preventive steps.

Regular Health Screenings

For individuals at high risk, regular health screenings and monitoring can facilitate early detection, improving the chances of successful treatment outcomes.