Stages of Cancer: Understanding Each Stage and Its Impact

Cancer Stages Explained: From Early to Advanced Stages

Hearing "cancer" can bring uncertainty. You might feel surrounded by unfamiliar terms and medical reports, but most importantly, "What stage is it?"

It’s natural to feel uneasy when you come across staging. But it’s meant to guide you. It provides oncologists with a clear picture of how the cancer is behaving. It helps them choose the most effective and personalised treatment to give you the best possible outcome.

Understanding cancer staging

Understanding cancer staging Cancer staging helps oncologists know how far cancer has spread in the body. It determines the size of the tumour and whether nearby tissues or lymph nodes are involved. It also mentions if the cancer has spread to other parts of the body.

What is cancer staging?

Cancer staging is a system for describing the extent of cancer in a patient's body. It shows how much cancer there is and where it’s located.

The following are two types of staging:

• •Clinical staging (cTNM):
  It's performed before any surgery or major treatment, using physical exams, CT scans, MRIs, and biopsies to determine the extent of cancer spread. It helps decide whether to do surgery first or start with chemotherapy or radiation.
• •Pathological staging (pTNM):
  It’s done after surgery, when oncologists can directly examine the tumour and nearby tissues that have been removed. It gives more precise information because the tissues are studied under a microscope. Pathological staging often shows how much cancer was present.

How are stages of cancer determined?

The following tests and procedures help know the stages of cancer.

• •Physical exams for detecting lumps or abnormal growths.
• •Imaging tests like CT scans, MRIs, PET scans, or X-rays to check cancer spread.
• •Biopsies to examine tissue samples.
• •Blood tests to assess tumour markers or signs of organ function.

Such tests are also applicable for different types of cancers such as stages of breast cancer, lung cancer, or cervical cancer.

Why staging matters for treatment and prognosis?

Staging helps oncologists decide which treatment will be most effective. For example, patients in the early stages may respond well to surgery or radiation. But advanced stages might need chemotherapy, targeted therapy, or immunotherapy.

It also helps predict outcomes and the potential for cancer remission. Early-stage cancers often have higher remission rates and better long-term recovery prospects.

Cancer grading and staging differences

Cancer grading and staging are related but distinct concepts.

Staging describes the cancer's size and spread in the body. On the other hand, grading refers to the abnormality of the cancer cells as observed under a microscope. It helps oncologists understand how fast the cancer might grow or spread.

How many stages of cancer are there?

The total stages of cancer are five, from Stage 0 to Stage 4.

Let’s explore the different stages of cancer:

Stage 0 cancer: Initial stage of cancer

At this stage, the cancer cells are typically found only in the location where they originated. They haven't spread to nearby tissues. It's considered highly treatable.

1st stage of cancer: Early stages of cancer

Stage 1 cancer means the tumour is small and confined to its original location. This is considered an early stage and often can be treated effectively with surgery or localised therapies like radiation.

The five-year survival rate for stage 1 lung cancer after surgery is close to 80%.

Stage 2 cancer: Moderate progression

This stage shows moderate progression. The tumour may be larger than stage 1 and may have started to involve nearby lymph nodes, but has not spread to distant parts of the body.

Treatments may include surgery, radiation, and sometimes chemotherapy to control the growth and spread.

Stage 3 cancer: Advanced stage cancer

At stage 3, the tumour is larger and has reached to nearby tissues or lymph nodes. Though it's an advanced stage, there's still a hope.

4th stage cancer: Last stage of cancer

Stage 4, also known as metastatic cancer, means the cancer has spread to other parts of the body. It’s most commonly seen in stages of brain cancer or bone cancer.

Types of cancer staging systems

Cancer affects every person differently, and no two cases are precisely the same. That's why oncologists use different staging systems. So, how is cancer staged?

TNM system explained

The TNM system is one of the most widely used methods for describing stages of cancer. It provides a detailed picture of the tumour and its behaviour.

Decoding the TNM system for different stages of cancer:

• •T (Tumour):
  Describes the size and extent of the main tumour.
• •N (Nodes):
  Indicates whether the cancer has spread to nearby lymph nodes.
• •M (Metastasis):
  Shows if the cancer has spread to distant parts of the body.

For example, T1 means a small tumour, while T4 indicates a larger one. Similarly, N0 means no lymph nodes are affected, and M0 means the cancer hasn't spread to other organs. The cancer stage is determined by combining these values.

Number-based staging system

The number-based system classifies cancer stages name into five categories:

Other systems used for specific cancers

Some cancer types require their own systems because they behave differently or don't form solid tumours.

• •Blood cancers:
  These don't form solid tumours, so the TNM system doesn't apply. Instead, the Ann Arbour system for lymphomas, the Rai or Binet systems for CLL, and the ISS or Durie-Salmon system for multiple myeloma are used.
• •Gynaecological cancers:
  These are staged using the FIGO system , which remains specific to reproductive organs. It ranges from Stage 0 to IV, based on how much the cancer has spread.
• •Brain and Central Nervous System (CNS) cancers:
  Since these cancers rarely spread outside the brain or spinal cord, grading is used instead of staging.
• •Paediatric cancers:
  Cancers in children behave differently from those in adults. That’s why the St. Jude system is used for childhood cancers.
• •Other solid tumours:
  For skin cancers like melanoma, oncologists often use the Clark level and Breslow thickness to measure the depth of the tumour.

Tests to determine cancer stage

Based on your symptoms, oncologists conduct various tests, depending on the type of cancer.

Imaging tests

Imaging tests show how advanced the cancer is and whether it has reached nearby lymph nodes or distant organs. Each test provides different details, such as:

Biopsies and lab tests

Additionally, lab tests on blood, urine, or other body fluids may also be done to check for tumour markers or other changes that indicate cancer behaviour.

Additional examinations by specialists

Sometimes, your oncologist may recommend further evaluations to be done by specialists such as:

• •An endoscopy for digestive tract cancers.
• •A colposcopy for cervical or vaginal cancers.
• •An eye exam, bone marrow test, or lumbar puncture for blood or brain cancer.

Key factors affecting cancer stage

The cancer stage is often determined by the following three components of the TNM system.

Tumour size and growth

One of the first things oncologists assess is the size of the tumour and how deeply it has grown into nearby tissues. Larger tumours or those that grow into surrounding tissues often indicate a more advanced stage.

Spread to lymph nodes

If cancer is found in nearby lymph nodes, it means it has likely spread from its original site. Cancers in distant lymph nodes are usually more advanced.

Metastasis to other organs

Metastasis refers to cancer spreading to body parts like lungs, liver, bones, or brain. It means the cancer has entered the bloodstream or lymphatic system and travelled to other organs. It’s considered as the last stage of cancer.

Timely support can give better results

Learning about cancer staging can make you feel anxious. But remember that it’s not a verdict. It helps understand exactly what your body needs and how to treat it best.