Learn how childhood cancer is diagnosed through exams, blood tests, imaging, biopsies, and molecular testing. Understand preparation, procedures, and result interpretation.

Cancer Diagnosis and Staging
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Cancer Diagnosis and Staging

Cancer diagnosis and staging involve a coordinated series of examinations used to confirm whether cancer is present, identify its type, and determine its extent in the body. These findings help specialists develop an individualized treatment plan and define the most appropriate next steps in care.

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Defining the Disease Before Planning Treatment

Cancer cannot usually be diagnosed through a single examination. The diagnostic process may include a detailed medical history, physical examination, laboratory analysis, imaging, endoscopic procedures, and biopsy. The tests selected depend on the patient’s symptoms, suspected cancer type, previous findings, and individual risk factors.

When cancer is confirmed, further assessment may be required to evaluate the primary tumor, nearby lymph nodes, and possible spread to other parts of the body. This process is called staging and plays an important role in treatment planning.

Clinical Evaluation

Symptoms, medical history, family history, and physical examination findings guide the initial diagnostic pathway.

Laboratory and Imaging Tests

Blood tests, ultrasound, CT, MRI, PET/CT, mammography, or other examinations may be used according to the suspected cancer type.

Biopsy and Pathology

A tissue or cell sample is examined to confirm the diagnosis and identify the tumor’s microscopic characteristics.

How Is Cancer Diagnosed?

The diagnostic process begins with a detailed assessment of the patient’s symptoms and medical history. A physician may request targeted tests to investigate a lump, unexplained bleeding, persistent pain, or an abnormal laboratory or imaging result.

Imaging examinations can help identify the location, size, and characteristics of a suspicious area. However, imaging findings alone may not be sufficient to confirm cancer. In many cases, a biopsy is required to collect tissue, cells, or fluid for examination by a pathologist.

The pathology report may identify the cancer type, tumor grade, cell characteristics, surgical margins, lymph node involvement, and relevant molecular features. These findings support both diagnosis and treatment planning.

Clinical Assessment

The physician reviews symptoms, previous medical conditions, medications, family history, risk factors, and physical examination findings.

Diagnostic Testing

Laboratory tests, imaging, endoscopy, or organ-specific examinations are selected according to the initial clinical assessment.

Tissue Diagnosis

Biopsy and pathological examination determine whether cancer cells are present and help classify the tumor.

Staging and Specialist Review

All available findings are evaluated together to establish the extent of the disease and determine the next steps in care.

cancer
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Essential Components of an Accurate Diagnosis

Pathological Examination

Pathology plays a central role in confirming the presence and type of cancer. Microscopic examination of tissue can also provide information about tumor grade, boundaries, lymph node involvement, and biological characteristics.

Diagnostic Imaging

Ultrasound, mammography, CT, MRI, PET/CT, bone scans, and other imaging methods can help pinpoint the location of a tumor, assess surrounding structures, and investigate whether the disease has spread.

Molecular and Biomarker Testing

For selected cancers, tissue, blood, or other body fluids can be tested for specific genes, proteins, or biomarkers. These findings can provide additional information about tumor biology and help specialists evaluate appropriate treatment options.

Understanding Cancer Staging

Cancer staging describes how much cancer is present at the time of assessment and how much it has spread. The stage can influence treatment choice, the order in which treatments are administered, and how the disease is monitored.

Understanding Cancer Staging

Cancer staging describes how much cancer there is at the time of assessment and how much it has spread. The stage can affect treatment choice, the order in which treatments are administered, and how the disease is monitored.

Many solid tumors are evaluated using the TNM staging system. However, staging methods can vary depending on the type of cancer, the organ affected, and the biological characteristics of the disease.

How Does the TNM Staging System Work?

Tumor

T describes the size and local spread of the primary tumor, including whether it has spread to nearby tissues.

Lymph Nodes

N indicates whether the cancer has spread to regional lymph nodes and may describe the number or location of affected nodes.

Metastasis

M indicates whether the cancer has spread to distant organs or tissues from its original location.

Cancer Stages (Stage 0 - Stage 4)

TNM findings are generally combined as a general staging system. Stage 0 may describe abnormal cells that remain confined to their original location. Stages I to III generally indicate an increase in tumor size, local spread, or regional lymph node involvement. Stage 4 generally indicates that the cancer has spread to distant parts of the body.

The precise meaning of each stage varies between cancer types. Therefore, a stage should always be interpreted in conjunction with specific diagnostic, pathological findings and other clinical information.

Clinical Stage, Pathological Stage, and Tumor Grade

Clinical staging is based on information obtained prior to treatment, including physical examination, imaging, endoscopy, and biopsy findings. Pathological staging includes additional information obtained during surgery and from the examination of removed tissue.

Tumor grade is different from cancer stage. Grade describes how normal or abnormal the cancer cells appear under a microscope and can provide information about how the tumor will behave. Stage describes the size and extent of the cancer and whether it has spread.

Why Choose Liv Hospital for Cancer Diagnosis and Staging?

Multidisciplinary Diagnostic Review: Radiology, pathology, nuclear medicine, medical oncology, surgical oncology, radiation oncology, and other relevant specialties work together according to the patient’s diagnostic needs.

Comprehensive Diagnostic Planning: Laboratory analysis, imaging, endoscopic procedures, biopsy, pathological examination, and molecular testing can be coordinated within an individualized diagnostic pathway.

Integrated Evaluation of Findings: Imaging results, pathology reports, laboratory findings, and clinical observations are reviewed together to provide a more complete understanding of the disease.

Personalized Treatment Preparation: Diagnostic and staging findings are used to determine the appropriate treatment sequence, specialist involvement, and follow-up plan for each patient.

Frequently Asked Questions

Is a PET-CT scan dangerous?

The radiation dose from a PET-CT is low—about the same as natural background radiation you would receive over 3–5 years. The radioactive sugar tracer (FDG) has a very short half-life and leaves your body through urine within hours. Drink plenty of water after the scan to flush it out.

Does a biopsy cause cancer to spread?

This is a common myth. There is no scientific evidence that a needle biopsy causes cancer to spread or "seed" into the track. The risk is theoretical and extremely rare. The risk of not knowing the cancer type is far, far greater.

What is the difference between Clinical Staging and Pathological Staging?
  • Clinical Staging: Based on scans (CT/MRI) before surgery. It is an estimate.

Pathological Staging: Based on what the pathologist sees under the microscope after surgery. This is the definitive stage and may upgrade or downgrade your treatment plan.

Can I eat before a PET scan?

No. You must fast for 6 hours.

Why? The scan looks for sugar uptake. If you eat, your insulin levels rise, and the sugar goes to your muscles instead of the tumor, making the scan blurry or useless. You can drink water only.

How long does genetic testing (NGS) take?

Comprehensive genomic profiling (looking at 300+ genes) is complex. It typically takes 10–14 business days. While waiting, we may start standard treatment, then adjust course once the genetic "roadmap" arrives.