What Is Non-Small Cell Lung Cancer (NSCLC)?

Being one of the most prevalent types of cancer that leads to fatalities, non-small cell lung cancer or NSCLC, is a significant topic of discussion. It is the most prevalent form of lung cancer, contributing to around 85% of all lung cancer cases.

Unlike small cell lung cancer (SCLC), NSCLC has different growth, spread, and treatment response modes. Despite the subtype and the risk factors involved, early detection of NSCLC is vital in ensuring prompt treatment and quicker patient recovery.

If you are curious about NSCLC or have been experiencing similar symptoms, this comprehensive guide from Dr. Arvind Kumar will closely examine all the relevant insights.

Non-Small Cell Lung Cancer (NSCLC) – Overview

Before we head to take a look into the different risk factors, causes, etc., it is paramount that we understand what NSCLC is and how it impacts people.

Non-Small Cell Lung Cancer (NSCLC) is a type of lung cancer that shares similar cellular structures and treatment approaches. Unlike Small Cell Lung Cancer (SCLC), which is aggressive and spreads quickly, NSCLC generally grows slower.

NSCLC encompasses a broader range of cancer cell types, each with unique features. This diversity makes NSCLC a more complex disease to understand and treat. Despite the slow rate of progression, early detection of this category of lung cancer is crucial to prevent further metastasis of the lung cancer and worsening of the symptoms and prognosis.

Also Read:How Is Lung Cancer In Women Different?

Subtypes and Characteristics of Non-Small Cell Lung Cancer

To better understand NSCLC and its impacts on the body, the key is to be aware of the varying non-small cell lung cancer types and their characteristics.

NSCLC is a collection of different subtypes, each arising from different types of cells within the lung and exhibiting varying growth patterns and responses to treatment.

Following are a few subtypes to keep a look into:

1. Adenocarcinoma

This is the most common subtype of NSCLC, often originating in mucus cells. It can develop in the outer parts of the lung and is sometimes associated with non-smokers, although smoking remains a significant risk factor. Adenocarcinoma can be categorized into subtypes like adenocarcinoma in situ (AIS), minimally invasive adenocarcinoma (MIA), and invasive adenocarcinoma, reflecting the extent of the cancer’s spread.

Characteristics:

• Typically develops in the outer regions of the lungs
• More frequently found in non-smokers and former smokers
• Slow-growing but can spread early to distant organs
• Associated with mutations like EGFR, ALK, ROS1, and KRAS

2. Squamous Cell Carcinoma

This subtype arises from the cells lining the airways of the lung. It is strongly linked to smoking and is often located in the central part of the lung. Squamous cell carcinoma tends to grow more slowly than other subtypes.

Characteristics:

• Accounts for about 25-30% of NSCLC cases
• Originates in the bronchial tubes (central part of the lungs)
• More likely to cause lung obstruction and bleeding
• Slower spread compared to adenocarcinoma but can grow into large tumours

3. Large Cell Carcinoma

This is a less common subtype characterized by large, abnormally shaped cells. It is a diagnosis of exclusion, meaning it’s diagnosed when the cancer cells don’t fit into other specific categories. Large cell carcinoma can be aggressive and challenging to treat.

Characteristics:

• Least common type, accounting for about 10-15% of NSCLC cases
• Can develop anywhere in the lungs
• Fast-growing and aggressive compared to other NSCLC types
• Difficult to treat, often requiring chemotherapy and radiation therapy

Besides these major categories, there are other, less frequent subtypes of NSCLC, such as adenosquamous carcinoma and sarcomatoid carcinoma. These are rare and have unique characteristics requiring targeted treatment approaches.

What are the Causes of Non-Small Cell Lung Cancer?

The list of non-small cell lung cancer causes is quite extensive. Given that lung cancer is usually associated with smoking as a significant trigger, many people have this misconception that NSCLC is generally only found in smokers, which isn’t the case.

Even non-smokers are at risk of developing NSCLC due to other environmental and chemical triggers.

Following are a few causes and risk factors to watch out for:

Smoking

Without a doubt, the most common trigger behind the onset of NSCLC is smoking. The tobacco in cigarettes contains thousands of harmful chemicals, which are carcinogenic, elevating the risks of lung cancer. The risk of lung cancer from smoking increases with the duration and intensity of smoking. What’s surprising is that not only primary smoking, but even second-hand smoke can lead to the risks of NSCLC.

Exposure to air pollutants

The air that we are breathing in is not the cleanest and is instead filled with pollutants and toxins, whose long-term exposure often leads to a lot of complications, including the onset of lung cancer from air pollution. Long-term exposure to pollution, radon gas, and industrial chemicals are the main factors contributing to the complications. Some common environmental pollutants and carcinogens include lung cancer from asbestos, arsenic, diesel exhaust, and silica dust.

Family history or genetic predisposition

If you have a family history of lung cancer, especially NSCLC, that also increases your risk of developing the condition. Specific genetic mutations like EGFR, ALK, and KRAS can lead to the development of NSCLC, even in the case of non-smokers. This explains the need for annual check-ups and testing for early detection in case the lung cancer starts forming.

Radiation exposure

People who have had a history of exposure to radiation therapy to the chest also increase the risks of NSCLC. This includes getting frequent X-rays, CT scans, or nuclear radiation exposure due to other chronic ailments.

Chronic lung disease

Patients who consistently suffer from chronic lung disease are also at heightened risk of eventually suffering from lung cancer, primarily from NSCLC. Diseases like chronic obstructive pulmonary disease (COPD), pulmonary fibrosis, and tuberculosis often elevate your risks of developing NSCLC in the future.

What are the Non-Small Cell Lung Cancer Symptoms?

Since lung cancer treatment and recovery heavily rely on an early detection and comprehensive treatment plan, being aware of the symptoms is quintessential. If you notice any or multiple of the following symptoms occurring recurrently, that is a sign that there could be something wrong that requires proper diagnosis and treatment.

Some of the common symptoms include:

• Persistent cough that worsens over time
• Coughing up blood (hemoptysis)
• Chest pain or discomfort
• Shortness of breath (dyspnea)
• Hoarseness or changes in voice
• Unexplained weight loss and loss of appetite
• Persistent fatigue
• Wheezing and difficulty breathing
• Recurrent lung infections (pneumonia, bronchitis)

Beyond these, the symptoms of NSCLC also have advanced complications, which can affect major organs in the body. Being wary of these symptoms ensures a quicker diagnosis and targeted treatment.

Organ Affected	Symptoms
Brain	Headaches, dizziness, seizures, memory loss
Bones	Pain, fractures, bone weakness
Liver	Jaundice, abdominal swelling
Lymph nodes	Swelling in the neck or underarms

As mentioned in the table, the advanced symptoms usually occur when the NSCLC has spread beyond the lungs.

How Is Non-Small Cell Lung Cancer Diagnosed?

To better understand and gauge the non-small cell lung cancer survival rate, the key is to get a confirmed early diagnosis. The earlier the diagnosis, the earlier the implementation of the treatment protocol for a better prognosis of the patient.

Also Read: What Is Lung Cancer Survival Rate

Some of the most common diagnostic routes include:

Diagnostic Tests for NSCLC	Different Types
Imaging tests	Chest X-ray, PET Scan, CT Scan
Biopsy and lab tests	Bronchoscopy, Needle biopsy, Molecular testing (rare cases)
Pulmonary function tests	Determine lung capacity before planning the treatment route

What are the Stages of NSCLC?

NSCLC is classified into five stages that help guide treatment options:

• Stage 0: Carcinoma in situ, or CIS
• Stage 1: Cancer is localized in the lung and has not spread to lymph nodes
• Stage 2: Cancer has spread to nearby lymph nodes but remains in the lung
• Stage 3: Cancer has spread to distant lymph nodes and nearby organs

• Stage 4: Cancer has metastasized to distant organs like the brain, bones, or liver

A thorough breakdown of the individual stages of NSCLC is better explained by the American Cancer Society here. This explains all about the non-small cell lung cancer ICD-10 in detail, breaking down every cancer stage, its characteristics and its spread.

What are the Non-Small Cell Lung Cancer Treatment Options?

Following a successful diagnosis and staging of the NSCLC, the next step is curating a thorough and personalised lung cancer treatment plan for the patient.

Depending on the patient’s NSCLC stage, the spread and also the overall well-being of the patient, the following are some of the treatment options available:

Type of NSCLC Treatment	Used for	Includes
Surgery	Early-stage NSCLC (Stage 1 & 2)	Lobectomy, Pneumonectomy, and Segmentectomy
Radiation therapy	Early-stage cancer, inoperable cases, or palliative care	High-energy beams destroy cancer cells
Chemotherapy	Before surgery (neoadjuvant), after surgery (adjuvant), or for advanced cases	Kills rapidly dividing cancer cells
Immunotherapy	For genetic mutations like EGFR, ALK, ROS1, BRAF	Includes drugs like Osimertinib, Crizotinib, Alectinib
Palliative care	Where none of the other treatments would work, and the patient needs to be comfortable for the remaining days	Focuses on pain management, symptom relief, and quality of life improvement

The correct treatment plan for the patient usually depends on the overall well-being of the patient and Dr. Arvind Kumar will also conduct thorough testing and staging of the NSCLC before curating the treatment plan.

Final Words

If you have concerns about lung cancer or are experiencing any symptoms, don’t hesitate to seek medical attention. Given that NSCLC is the most common form of lung cancer, its manifestation is a lot more prevalent than many people want to admit. Since early diagnosis and intervention have the power to offer better prognosis and possible remission after treatment, the key is to be alert about odd symptoms and take a proactive approach to get the symptoms tested.

If you’re seeking expert care for lung cancer, Dr. Arvind Kumar, a leading specialist in thoracic oncology, offers state-of-the-art diagnosis, treatment, and personalised care plans.

Schedule your consultation by contacting our team at +91-9773635888.