Introduction

Lung cancer is a devastating disease involving uncontrolled proliferation of abnormal cells in the lung, eventually forming a tumor; such cancerous cells can invade and affect the nearby tissues or distant parts of the body. Knowing the stages of lung cancer is essential since it allows medical professionals to track the disease's progression and choose the best course of treatment.

Lung cancer stages can be determined through diagnostic and investigative procedures such as a physical exam, imaging, biopsy, and other tests. The tumor's size, location, and spread to lymph nodes or other regions or parts of the body are all indicated by the stage. Despite the complexity of treatment at an advanced stage, there is always a therapy option. Moreover, your outcome depends on your cancer type, features, and overall health.

What are the stages of lung cancer?

Lung cancer is classified into small and non-small cell lung cancer, out of which small cell lung cancer is more prevalent and is divided into stages 0-IV. At the same time, the latter rarely occurs and is classified as limited- or extensive-stage disease, or it follows the TNM system. The latter follows the same staging system as NSCLC. Thus, the stage of lung cancer is a classification system that helps cancer specialists determine the tumor’s size, location, and spread.

Lung cancer TNM Staging System:

• T stands for tumor size and invasion of nearby tissues.
• N indicates involvement of regional lymph nodes.
• M denotes tumor metastasis.

In addition to this system, other systems can be used to determine the lung cancer stages, depending on cancer type.

What is stage 0 lung cancer?

Carcinoma in situ is the term used to describe stage 0 cancers. Abnormal malignant cells limited to the lining of the airways, unable to spread to nearby tissues, are the hallmark of this stage of lung cancer. Rarely does this sort of cancer show any signs, and it can only be unintentionally found while looking at other illnesses.

The treatment options depend on the tumor location and type of abnormal cells. Local procedures, surgery, and endobronchial therapy can be used to treat this condition. When diagnosed and treated correctly, the prognosis is excellent compared to invasive lung cancer.

What is stage I lung cancer?

This lung cancer stage is further separated into stage IA and IB. This tumor type is confined to the lung and has not reached the lymph nodes. The tumor is generally small, although its size and shape determine the IA or IB classification. Most patients with stage I lung cancer do not present with apparent symptoms. Some may have a persistent cough, while others have no signs of illness. Thus, stage I lung cancer can only be diagnosed with imaging techniques.

The ideal treatment for those with good performance status is surgery. But at times when surgery is not feasible, for instance, in older patients, then SBRT can be an effective form of treatment. Apart from surgery and SBRT, other treatment options may work for patients, depending on the tumor type and overall health. There is also adjuvant treatment in case of recurrence.

What is stage II Lung Cancer?

Stage II tumors are generally larger and may have invaded nearby tissues or regional lymph nodes. This cancer stage can also be separated into IIA and IIB. Some symptoms such as a persistent cough, chest pain, breathlessness, fatigue, and frequent infections may occur. However, these signs and symptoms are not specific and cannot be used to diagnose this condition.

Surgery is the best treatment option, suitable for patients with good health and physical performance and tumors that can be removed via a minimally invasive procedure. Concurrent chemoradiation may be recommended for most patients with stage II NSCLC or those who cannot undergo surgery. Moreover, immunotherapy and targeted therapy can be recommended for people with specific tumor characteristics. Radiation therapy can also be considered in some cases.

What is stage III Lung Cancer?

Stage III tumors are large and destructive, invading nearby tissues and spreading to several lymph nodes. The tumor may affect the opposite side of the chest or the same region. Based on the size of the tumor and the degree of lymph node metastasis, this cancer stage is divided into IIIA, IIIB, and IIIC. However, it does not indicate distant spread to other parts of the body.

Stage III lung cancer is more complex to treat, and treatment options depend on tumor location, lymph node involvement, cell type, and molecular tumor features. Thus, treatment options such as chemotherapy, radiotherapy, immunotherapy, targeted therapy, and surgery can be used. In some cases, concurrent chemoradiotherapy and immunotherapy can be used to manage patients with IIIA-IIIC NSCLC, depending on tumor location and molecular tumor features. Furthermore, other patients may receive standard chemotherapy followed by radiotherapy or different treatment options based on molecular profiling.

What is stage IV Lung Cancer?

Stage IV tumors are classified into IVA and IVB based on tumor spread to distant body parts. Thus, the cancerous cells have invaded other regions of the body, such as the brain, bones, liver, and adrenal glands. Patients with distant spread may present various symptoms depending on the tumor location in addition to lung cancer-specific signs and symptoms.

There are many treatment options for people with metastatic tumors, such as immunotherapy, targeted therapy, chemo-radiotherapy, chemotherapy, and radiotherapy, among others. It is important to perform molecular profiling of the tumor, as certain genetic mutations may influence targeted therapy. In addition, many supportive and palliative treatments can be performed to improve patients' well-being and deal with lung cancer complications.

How is small cell lung cancer staged?

Small cell lung cancer develops and spreads quickly; thus, its staging system differs from that of NSCLC. Doctors classify SCLC into limited- and extensive-stage disease. The former indicates tumors confined to one area of the chest that can be managed with a single radiation therapy. Concurrent chemoradiotherapy is the preferred treatment option for limited-stage SCLC. However, other treatment options such as immunotherapy can be recommended.

The term extensive-stage SCLC refers to tumors that have metastasized to a larger area of the chest cavity or have disseminated to other areas of the body. The treatment of choice for extensive-stage SCLC is chemo-immunotherapy. Radiation therapy is another treatment method that is useful under certain circumstances.

What tests are used for lung cancer staging?

Various diagnostic and investigative procedures can be used to determine the stage of lung cancer. These procedures include an imaging scan, bronchoscopy, brain MRI, lymph node biopsy, and tumor biopsy. A biopsy is critical for confirming the diagnosis and determining the cancer type. Molecular tumor profiling is generally helpful in guiding cancer treatment and selecting the most appropriate therapy for each patient. Furthermore, staging procedures are often repeated to determine the tumor response to treatment.

Conclusion

Lung cancer has several stages depending on tumor size, location, and spread. For example, stage 0 tumors are generally small and may have invaded nearby tissues or regional lymph nodes. However, the prognosis of this cancer type is excellent when managed with the appropriate treatment. Although there is no best time to get tested or know your lung cancer stage, timely diagnosis and individualized treatment help you live longer and improve your quality of life.

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