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Types of Lung Cancer and Their Treatment Approaches

27 Nov, 2023

Blog author iconHealthtrip Team

Lung cancer, one of the leading causes of cancer-related deaths worldwide, poses a significant health challenge. It is characterized by the uncontrolled growth of abnormal cells in the lungs and is often diagnosed late due to its subtle early symptoms. Statistics reveal its high incidence and mortality rates, underscoring the urgency for early detection and effective treatment. Early diagnosis greatly improves treatment outcomes, making awareness and regular screenings, particularly for high-risk individuals, essential in combating this disease.

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Types of Lung Cancer

The types of lung cancer can be primarily categorized into two main groups: Non-Small Cell Lung Cancer (NSCLC) and Small Cell Lung Cancer (SCLC), along with some other rare types. Each type has distinct characteristics, growth patterns, and implications for treatment.

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1. Non-Small Cell Lung Cancer (NSCLC)

NSCLC is the most common type of lung cancer, accounting for approximately 85% of cases. It is known for its relatively slower growth and spread compared to SCLC. NSCLC is further divided into three main subtypes:

  • Adenocarcinoma: This is the most common form of lung cancer, especially among non-smokers. Adenocarcinomas typically originate in the outer parts of the lungs and can develop in several different types of lung cells. While they generally grow and spread more slowly than other lung cancers, their prognosis and treatment can vary widely depending on the stage at diagnosis and other factors.
  • Squamous Cell Carcinoma: Closely linked to smoking, squamous cell carcinoma usually forms in the central parts of the lungs, near a main airway (bronchus). This type of lung cancer is associated with a history of smoking and tends to be more centrally located in the lungs. As with other types of lung cancer, its treatment and prognosis depend on how advanced the cancer is at the time of diagnosis.
  • Large Cell Carcinoma: This subtype is less common and is known for its rapid growth and tendency to spread quickly. Large cell carcinoma can occur in any part of the lung. Due to its aggressive nature, early detection and treatment are crucial for better outcomes.

2. Small Cell Lung Cancer (SCLC)

SCLC accounts for about 10-15% of lung cancers. This type is particularly aggressive and is almost always associated with smoking. It is characterized by rapid growth and a high propensity for early metastasis, often spreading to other parts of the body quickly. SCLC typically starts in the bronchi and rapidly progresses, often presenting at an advanced stage when first diagnosed.

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3. Other Rare Types

In addition to NSCLC and SCLC, there are rare types of lung cancer, such as:

  • Carcinoid Tumors: These are a type of neuroendocrine tumor and tend to be less aggressive than other forms of lung cancer. Carcinoid tumors often grow slowly and can sometimes be cured if found early.
  • Lung Sarcomatoid Carcinoma: This is a rare and more aggressive form of lung cancer. It is a type of NSCLC but behaves more aggressively and is often more resistant to traditional chemotherapy treatments.

The understanding of these different types of lung cancer is crucial for determining the most appropriate treatment approach. Each type has unique characteristics that influence treatment decisions, and advancements in medical research continue to improve the understanding and management of these diverse forms of lung cancer.

Diagnostic Approaches

Diagnosing lung cancer involves several steps:

  • Imaging Tests: These include chest X-rays and CT scans to identify abnormal masses or nodules.
  • Biopsy Techniques: Procedures like bronchoscopy or needle biopsy help in obtaining tissue samples for cancer cells identification.
  • Molecular Testing: Essential for identifying specific mutations, guiding targeted therapy decisions.

Treatment Approaches for Lung Cancer

1. Surgery

Surgery, as a primary treatment for early-stage NSCLC, involves removing the cancerous tissue along with a margin of healthy tissue.

  • Lobectomy: In this most common lung cancer surgery, an entire lobe of the lung is removed. This procedure is typically chosen when the cancer is confined to one lobe of the lung. The feasibility of a lobectomy depends on the patient's lung function and overall health status.
  • Segmentectomy: This procedure involves removing part of a lobe and is often used for smaller tumors or patients with limited lung function where a lobectomy may be too risky. Segmentectomy aims to preserve lung capacity while effectively removing the tumor.
  • Pneumonectomy: The removal of an entire lung is a more extensive surgery, usually reserved for centrally located tumors that involve multiple lobes. Pneumonectomy is a major operation and requires careful consideration of the patient's ability to function with one lung.

2. Radiation Therapy

Radiation therapy is a versatile treatment option for lung cancer, using high-energy rays to target and destroy cancer cells.

  • As Primary Treatment: For patients who cannot undergo surgery due to health issues or the location of the tumor, EBRT offers a non-invasive alternative. This approach can effectively target tumors, although it may not be as definitive as surgery.
  • Post-Surgery: Radiation therapy is often used after surgery (adjuvant therapy) to eliminate any microscopic cancer cells that may remain. This approach aims to reduce the risk of cancer recurrence.
  • For Advanced Cancer: In later stages, radiation therapy helps alleviate symptoms such as pain or breathing difficulties, improving the patient's quality of life even if the cancer is not curable.

3. Chemotherapy

Chemotherapy uses powerful drugs to target and kill rapidly dividing cancer cells and is versatile in its application.

  • Before Surgery (Neoadjuvant Chemotherapy): This approach aims to shrink the tumor before surgical removal, potentially making surgery easier and more effective.
  • After Surgery (Adjuvant Chemotherapy): Administered post-surgery to eradicate any remaining cancer cells, reducing the risk of cancer recurrence.
  • Main Treatment for SCLC and Advanced NSCLC: Due to the aggressive nature of SCLC and advanced NSCLC, chemotherapy is often the primary treatment modality, either alone or in combination with other treatments.

4. Targeted Therapy

Targeted therapy offers a more personalized approach to cancer treatment by focusing on specific genetic mutations.

  • EGFR Inhibitors: Effective in targeting tumors with epidermal growth factor receptor (EGFR) mutations. These drugs are less toxic than traditional chemotherapy and can significantly inhibit tumor growth.
  • ALK Inhibitors: Aimed at cancers with alterations in the anaplastic lymphoma kinase (ALK) gene. These inhibitors have shown remarkable efficacy in shrinking or controlling tumor growth.
  • Other Targeted Drugs: Depending on the presence of specific genetic changes in cancer cells, other targeted drugs are being developed and used, often resulting in improved response rates and fewer side effects compared to traditional chemotherapy.

5. Immunotherapy

Immunotherapy has become a game-changer in lung cancer treatment, particularly for advanced stages.

  • PD-1/PD-L1 Inhibitors: These drugs unmask cancer cells, allowing the immune system to detect and destroy them. They have been effective in prolonging survival in some lung cancer patients.
  • Combination with Other Treatments: Immunotherapy is increasingly being used in combination with other treatment modalities, offering synergistic effects that can enhance overall treatment efficacy.

6. Combination Therapies

The combination of different therapies is tailored to maximize treatment effectiveness and is based on the individual patient's cancer characteristics.

  • Combining Surgery, Radiation, and Chemotherapy in Early Stages: This approach can effectively manage the disease and prevent recurrence.
  • Advanced Stages: The use of chemotherapy, targeted therapy, and immunotherapy in combination can address the complex nature of advanced lung cancer, offering hope for extending survival and improving quality of life.

In conclusion, the management of lung cancer is multifaceted and personalized, integrating various treatment modalities to optimize patient outcomes. As research progresses, these treatments continue to evolve, offering new hope and improved quality of life for lung cancer patients. Regular monitoring and adaptation of treatment plans are essential in this dynamic field.

Emerging Treatments

The landscape of lung cancer treatment is rapidly evolving, driven by groundbreaking research and innovative technologies. Key areas of focus include:

  • New Drug Developments: Researchers are continually developing and testing new drugs that can more effectively target lung cancer cells with fewer side effects. This includes new chemotherapeutic agents, targeted drugs, and immunotherapies.
  • Immunotherapy Advancements: Immunotherapy has transformed the treatment of lung cancer, particularly for advanced stages. Ongoing research is focused on identifying new immune targets and developing more potent and specific immunotherapeutic agents.
  • Targeted Therapies: With the increasing understanding of the genetic changes that drive lung cancer, targeted therapies are becoming more refined. Research is ongoing to identify new molecular targets and develop drugs that are more effective and less toxic.
  • Clinical Trials: Clinical trials are crucial for evaluating the safety and efficacy of new treatments. They are the pathway through which new therapies become available to the public. Participation in clinical trials also offers patients access to cutting-edge treatments.

Living with Lung Cancer

Managing lung cancer is not just about the medical treatment; it's also about supporting the overall well-being of the patient:

  • Regular Follow-up Care: Ongoing medical monitoring is essential to manage the disease effectively and adjust treatment plans as needed.
  • Lifestyle Modifications: Adopting a healthy lifestyle, including a balanced diet, regular exercise, and quitting smoking, can help improve outcomes and quality of life.
  • Support Systems: Support from family, friends, and cancer support groups can provide emotional and practical assistance.
  • Mental Health Support: Dealing with a lung cancer diagnosis can be challenging. Access to mental health professionals, counseling, and support groups is important for managing stress, anxiety, and depression.

The treatment of lung cancer has seen significant advancements, particularly with the development of personalized medicine. The focus on individual patient’s genetic makeup and specific tumor characteristics has led to more effective and targeted treatments. Early detection and ongoing research are vital for continuing this progress. With these advancements, there is renewed hope for patients, offering better outcomes and improved quality of life.

As research continues to advance, it is essential for patients to stay informed about new developments and actively participate in their treatment decisions. The combination of innovative treatments, supportive care, and patient empowerment is key to improving the outlook for those living with lung cancer.

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The main types of lung cancer are Non-Small Cell Lung Cancer (NSCLC), accounting for about 85% of cases, and Small Cell Lung Cancer (SCLC), comprising about 10-15% of cases. There are also rare types like carcinoid tumors and lung sarcomatoid carcinoma.