About this course

Cancer (Tumor) Markers

1. Introduction to Tumor Markers

• Definition of tumor markers
  • Substances produced by cancer cells or host in response to cancer
• Types of markers
  • Proteins, enzymes, hormones, genes, receptors
• Ideal tumor marker characteristics
  • High sensitivity and specificity
  • Correlates with tumor burden
  • Detects early disease
• Limitations
  • False positives (inflammation, benign conditions)
  • Lack of specificity in some markers

2. Classification of Tumor Markers

2.1 Based on Biochemical Nature

• Oncofetal antigens
• Enzymes and isoenzymes
• Hormones
• Glycoproteins
• Genetic/molecular markers

2.2 Based on Clinical Use

• Screening markers
• Diagnostic markers
• Prognostic markers
• Predictive markers
• Monitoring markers

3. Major Tumor Markers and Their Clinical Applications

3.1 Prostate Cancer

• Prostate-Specific Antigen (PSA)
  • Screening and monitoring
  • Elevated in BPH and prostatitis

3.2 Liver Cancer

• Alpha-Fetoprotein (AFP)
  • Hepatocellular carcinoma
  • Also elevated in germ cell tumors

3.3 Gastrointestinal Cancers

• Carcinoembryonic Antigen (CEA)
  • Colorectal cancer monitoring
• CA 19-9
  • Pancreatic cancer

3.4 Ovarian Cancer

• CA-125
  • Monitoring epithelial ovarian cancer
  • Elevated in benign gynecologic conditions

3.5 Breast Cancer

• CA 15-3
• HER2/neu
  • Prognostic and predictive marker

3.6 Testicular Cancer

• Beta-hCG
• AFP

3.7 Thyroid Cancer

• Calcitonin
• Thyroglobulin

3.8 Hematological Malignancies

• BCR-ABL
• CD markers

4. Molecular and Genetic Tumor Markers

• Gene mutations (e.g., BRCA1/BRCA2)
• Oncogenes and tumor suppressor genes
• Circulating tumor DNA (ctDNA)
• MicroRNAs

5. Clinical Applications of Tumor Markers

5.1 Screening

• Limited use (e.g., PSA in prostate cancer)

5.2 Diagnosis

• Supportive, not definitive

5.3 Prognosis

• Indicates disease severity/outcome

5.4 Monitoring Treatment

• Assess response to therapy
• Detect recurrence

6. Laboratory Methods for Tumor Marker Detection

• Immunoassays (ELISA, CLIA)
• PCR and molecular techniques
• Flow cytometry (for hematological cancers)
• Next-Generation Sequencing (NGS)

7. Factors Affecting Tumor Marker Levels

• Biological variation
• Non-malignant conditions
• Analytical variability
• Sample handling

8. Interpretation of Tumor Marker Results

• Use trends rather than single values
• Combine with clinical and imaging findings
• Consider patient history

9. Emerging Trends in Tumor Markers

• Liquid biopsy
• Personalized oncology
• Multi-marker panels
• AI in biomarker interpretation

10. Limitations and Ethical Considerations

• Overdiagnosis
• Cost implications
• Psychological impact on patients
• Accessibility in low-resource settings (important for Kenya 🇰🇪 context)

Course curriculum

Tumor Markers

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