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Foundation Sciences · Histology

Immunohistochemistry Principles

⏱️ 45–60 minutes read 📖 Histology

Antibody-based detection of tissue antigens for diagnosis and classification of tumours.

📌 Learning Objectives

  • Describe the key principles of immunohistochemistry principles.
  • Explain the clinical relevance of immunohistochemistry principles.
  • Recognise common conditions linked to immunohistochemistry principles in MLA-style scenarios.

📋 Overview

Antibody-based detection of tissue antigens for diagnosis and classification of tumours. This topic integrates with pathology, pharmacology and clinical medicine and is frequently tested in UK medical school exams and the MLA.

🔬 Basic Science

Antibody-based detection of tissue antigens for diagnosis and classification of tumours. Detailed mechanisms, regulation and molecular interactions underpin both normal physiology and disease.

🏥 Clinical Relevance

Tumour of unknown primary workup, lymphoma subtyping, targeted therapy decisions.

🧪 Investigations

Relevant laboratory tests, imaging or histological examination are used as appropriate to the clinical context.

💊 Management

Management is condition-specific; principles include addressing the underlying biochemical/structural derangement, supportive care and targeted therapy where available.

Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.

🎯 MLA High-Yield Notes & Quick Revision ⌄
High-yield topic for the UK MLA — frequently appears in SBA questions linking histology concepts to clinical presentations and management decisions.
Applying biomedical science to clinical practice Diagnosis and investigation Pathophysiology of common conditions
  • Antibody-based detection of tissue antigens for diagnosis and classification of tumours.
⭐ Exam Pearls ⌄
⭐ High Yield
Cytokeratin = epithelial origin
Vimentin = mesenchymal
S100, HMB-45, Melan-A = melanoma
CD markers for lymphoma
💡 Clinical Pearl
: Tumour of unknown primary workup, lymphoma subtyping, targeted therapy decisions.
⚠️ Exam Tip — Common Mistakes
Confusing immunohistochemistry principles with related but distinct mechanisms.
Memorising pathways without linking to clinical disease.
🔑 Key Facts ⌄
Cytokeratin = epithelial origin
Vimentin = mesenchymal
S100, HMB-45, Melan-A = melanoma
CD markers for lymphoma
ER/PR/HER2 in breast cancer
📚 References ⌄
  1. BMJ Best Practice
  2. Robbins Basic Pathology
  3. Lippincott Illustrated Reviews: Biochemistry
  4. Wheater's Functional Histology
  5. NICE guidance where applicable.

Further Resources

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