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Immunohistochemistry: Methods, Standardization, and Applications Study Guide

This guide provides a comprehensive overview of basic immunochemistry and Immunohistochemistry (IHC) staining methods. It covers essential concepts such as antibody selection (monoclonal vs. polyclonal), optimization of staining parameters (titer, dilution, incubation time, temperature), antigen retrieval techniques (HIER, proteolytic digestion), and signal detection using enzymes like Horseradish Peroxidase (HRP) and Alkaline Phosphatase (AP) with various chromogens. The guide aims to explain t

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Immunohistochemical Staining and Antigen Retrieval Methods

Introduction to Immunohistochemical Staining Methods

An educational guidebook describing immunohistochemistry as a precise immunoassay used to determine the expression of biomarkers in tissue for cancer diagnosis and classification.

Immunohistochemistry (IHC)
Biomarker expression
Pre-analytical factors
Antigen retrieval
Primary antibody selection
Staining protocol optimization
Detection systems
Visualization of antigen/antibody complex
Counterstaining
Post-analytical interpretation
Standardization and reproducibility
Total Test approach
Formalin-fixed, paraffin-embedded (FFPE) tissue
Monoclonal and polyclonal antibodies
External quality assurance (EQA)
Companion diagnostics

Pre-analytical Factors in Immunohistochemistry and ISH

This chapter addresses pre-analytical variables including tissue handling, fixation, and processing to ensure meaningful interpretation and accurate detection of targets in immunohistochemistry and in situ hybridization.

Pre-analytical variables
Cold ischemic time
Fixation
10% Neutral buffered formalin
Alcohol fixation
Antigen retrieval
Tissue processing
Paraffin embedding
Section preparation
Biopsy specimens
Frozen sections
Control material
Validation

Antigen Retrieval Methods and Principles

This text discusses antigen retrieval (AR) techniques for formalin-fixed, paraffin-embedded (FFPE) tissue sections to restore antigenicity for immunohistochemical (IHC) staining and molecular analysis.

Antigen retrieval (AR)
Formalin-fixed, paraffin-embedded (FFPE) tissue
Heat-induced epitope retrieval (HIER)
Immunohistochemical (IHC) staining
Heating temperature and time
pH value of AR solution
Test battery approach
Citrate buffer
Tris-HCl buffer
Enzymatic pre-treatment
Tissue proteomics
In situ hybridization (ISH)
Automated staining platforms

Antigen Retrieval Methods for IHC Staining

This document describes various methods for antigen retrieval including PT Link, water bath, pressure cooker, autoclave, microwave oven, proteolytic pre-treatment, and combined deparaffinization and antigen retrieval.

PT Link water bath method
Conventional water bath heating
Pressure cooker heating
Autoclave heating
Microwave oven heating
Proteolytic pre-treatment
Combined proteolytic pre-treatment and antigen retrieval
Combined deparaffinization and antigen retrieval
Target retrieval solution
Proteinase K
Tris-Buffered Saline

Antigen Retrieval Protocol for Immunohistochemistry

A recommended specimen preparation procedure using PT Link and target retrieval solution for formalin-fixed, paraffin-embedded tissue sections.

Antigen retrieval protocol
Formalin-fixed, paraffin-embedded tissue sections
Target retrieval solution
Test battery approach
Citrate buffer
High pH buffers
Immunohistochemical staining
Automated instrument staining
Dehydration, clearing and permanent mounting

Antigen Retrieval and Tissue Extraction Methods

Research and diagnostic applications involving antigen retrieval, DNA and RNA extraction, and protein extraction from formalin-fixed, paraffin-embedded tissue.

Antigen retrieval
Formalin-fixed paraffin-embedded tissue
DNA extraction
RNA extraction
Protein extraction
Mass spectrometry
In situ hybridization
Microwave heating
Autoclave pretreatment
Immunohistochemistry

Fundamentals of IHC and ISH Methodologies

Guidebook to Immunohistochemical Staining Methods

A comprehensive resource describing immunohistochemistry as a precise immunoassay used to determine the expression of biomarkers in tissue for cancer diagnosis and classification.

Immunohistochemistry (IHC)
Pre-analytical factors
Antigen retrieval
Primary antibody selection
Staining protocol optimization
Detection systems
Visualization of antigen/antibody complex
Post-analytical interpretation
Standardization and reproducibility
Total Test approach
Formalin-fixed, paraffin-embedded (FFPE) tissue
External quality assurance (EQA)
Companion diagnostics
Monoclonal and polyclonal antibodies

Immunohistochemistry Staining Methods and Standardization

This document provides references regarding immunohistochemistry preparation, antigen retrieval, and standardization for formalin-fixed, paraffin-embedded tissues.

immunohistochemistry
antigen retrieval
formalin-fixed, paraffin-embedded tissues
peroxidase-labeled antibody method
immunopereoxidase technique
standardization
double immunoenzymatic labelling
monoclonal antibody

Pre-analytical Factors in IHC and ISH

The histological process involves pre-analytical, analytical and post-analytical stages that impact the accurate detection of targets in immunohistochemistry and in situ hybridization.

Immunohistochemistry (IHC)
In situ hybridization (ISH)
Pre-analytical variables
Cold ischemic time
Autolysis
Fixation
10% neutral buffered formalin (NBF)
Alcohol fixation
Antigen retrieval
Epitope preservation
Tissue handling
Grossing
Accessioning and documentation

Tissue Processing and Section Preparation

Principles of tissue processing, fixation methods, and section preparation for IHC and ISH staining.

Microwave fixation
Tissue processing
Paraffin embedding
Rapid tissue processing
Section preparation
Dewaxing and hydration
Formalin fixation
Antigen retrieval

Biopsy Specimen Processing and Frozen Sections

Biopsy specimens present challenges for the laboratory including susceptibility to drying artifacts and structural damage, requiring specialized accessories or alternative methods like frozen sections.

Biopsy specimen challenges
Drying artifacts
Nylon biopsy bags
Alcoholic eosin for tissue visibility
Frozen section preparation
Direct Immunofluorescence (DIF)
Rapid freezing techniques
Freezing artifacts
Endogenous enzyme quenching

IHC and ISH Method Controls

The interpretation of IHC and ISH results relies on the use of method controls including positive tissue controls, cell lines, and tissue microarrays.

Positive Tissue Controls
Control Cell Lines
Tissue Microarrays (TMAs)
Assay validity
Fixation and processing
Universal precautions

Validation of IHC and ISH Methods

Validation ensures that standardized procedures provide consistent and diagnostically useful results on tissues processed in a standardized manner.

Validation of protocols and reagents
Ready-to-Use (RTU) approach
Fixation time effects on antigens
ASCO/CAP recommendations for antibody validation
External quality assessment programs
Instrument validation
Verification of staining performance
Changes in fixation or processing protocols

Primary Antibody Selection and IHC Optimization

Selection of the Primary Antibody in IHC

Immunohistochemistry serves as a diagnostic, prognostic and predictive assay where the selection of the primary antibody and analytical conditions impact diagnostic sensitivity and specificity.

Immunohistochemistry (IHC)
Primary antibody selection
Diagnostic sensitivity and specificity
Tissue fixation process
Antigen retrieval method
Detection system
Tissue control material
Pre-analytic phase
Analytical phase
Post-analytic phase
Signal-to-noise ratio

Selection and Validation of Primary Antibodies

Technical optimization and validation processes for selecting primary antibodies, implementing new markers, and utilizing ready-to-use IHC systems.

Primary antibody selection
Technical optimization
Validation of new antibodies
Ready-to-use (RTU) IHC systems
Epitope retrieval methods
Heat-induced epitope retrieval (HIER)
Enzymatic proteolysis
Antigen sensitivity and specificity
Tissue microarrays (TMA)
Formalin fixation time
Antibody specificity and cross-reactivity
Standardization of IHC
Pre-analytical conditions
Positive and negative tissue controls

Immunohistochemistry Validation and Antibody References

This document provides references regarding the selection of the primary antibody and standardization of immunohistochemistry.

Selection of the Primary Antibody
Immunohistochemistry validation procedures
Standardization of immunohistochemistry
Rabbit monoclonal antibodies
Mouse monoclonal antibodies
Formalin fixation effects on immunohistochemistry
Antibody and antigen validation

Optimization of Immunohistochemistry Staining Methods

This text discusses the optimization of qualitative and semi-quantitative immunohistochemistry (IHC) tests, focusing on pre-analytical and analytical factors to ensure reproducibility and accurate antigen expression detection.

immunohistochemistry (IHC)
qualitative IHC tests
semi-quantitative IHC tests
reproducibility
pre-analytical and analytical factors
antigen expression
staining intensity and distribution
validation and verification
antigen retrieval
signal transfer and signal generation

Standardization and Methods of Antigen Retrieval

Standardization of Immunohistochemical Staining Methods

Patient safety depends on the standardization of all pre-analytical variables for accurate interpretation of results using IHC and ISH.

Immunohistochemical staining methods
Pre-analytical variables
Predictive markers
HER2
ER
PgR
In situ hybridization (ISH)
Standardization of immunohistochemistry

Antigen Retrieval in FFPE Tissue

Antigen retrieval techniques restore formalin-modified antigen molecular structures in formalin-fixed, paraffin-embedded tissue sections to enhance immunohistochemical staining.

Formalin-fixed, paraffin-embedded (FFPE) tissue
Heat-induced antigen retrieval (HIER)
Antigen unmasking/demasking
Heating temperature and heating time
pH value of AR solution
Citrate buffer
Tris-HCl buffer
Test Battery approach
Enzymatic pre-treatment
Tissue proteomics
In situ hybridization (ISH)
Immunoelectron microscopy (IEM)

Antigen Retrieval Methods for IHC Staining

Protocols for antigen retrieval using water bath, pressure cooker, autoclave, microwave oven, and proteolytic pre-treatment methods.

PT Link water bath method
Conventional water bath heating
Pressure cooker heating
Autoclave heating
Microwave oven heating
Proteolytic pre-treatment
Combined proteolytic pre-treatment and antigen retrieval
Combined deparaffinization and antigen retrieval
Target retrieval solution
Proteinase K
Deparaffinization and rehydration

Antigen Retrieval Protocol and Methods

A specimen preparation procedure using target retrieval solution for formalin-fixed, paraffin-embedded tissue sections in immunohistochemical staining.

Antigen retrieval protocol
Formalin-fixed, paraffin-embedded tissue sections
Target retrieval solution
Immunohistochemical staining
Test battery approach
Citrate buffer
High pH buffers
Automated instrument staining
Dehydration, clearing and permanent mounting

Antigen Retrieval and Molecular Extraction Techniques

Research and diagnostic applications involving antigen retrieval, DNA and RNA extraction, and protein extraction from formalin-fixed, paraffin-embedded tissue.

Antigen retrieval techniques
Formalin-fixed paraffin-embedded tissue
Microwave-enhanced in situ end-labeling
DNA and RNA extraction
Protein extraction for mass spectrometry
Immunohistochemistry
Autoclave pretreatment
In situ hybridization signal enhancement

IHC Protocol Optimization and Detection Methods

Basis for Optimal IHC Staining Protocols

An optimal staining protocol is characterized by robustness and correctness to minimize total variation through optimal signal transfer.

Robustness
Correctness
Pre-analytical factors
Analytical factors
Optimal signal transfer
Antigen expression levels
Chromogenic deposit
Unsaturated incubations
Saturated incubations

IHC Staining Protocol Optimization

An optimal staining protocol ensures optimal signal transfer and visual saturation to minimize the impact of variation and avoid false negative or false positive results.

Chemical saturation
Visual saturation
Signal to noise ratio
Antigen retrieval
High expression (HE) structures
Low expression (LE) structures
Pre-analytical factors
Analytical phase
Antibody dilution
Incubation time
Tissue section thickness
Counterstaining
Control tissue requirements
Verification and validation

Immunohistochemistry Detection Methods and Multi-Staining

This text explores immunohistochemistry techniques including direct and indirect staining, avidin-biotin systems, polymer-based methods, and catalyzed signal amplification for tissue pathology.

Immunohistochemistry (IHC)
Direct and indirect staining methods
Avidin-biotin complex (ABC) method
Labeled streptavidin-biotin (LSAB) method
Polymer-based IHC techniques
Catalysed signal amplification (CSA)
Improved catalysed signal amplification (iCSA)
Multi-staining immunohistochemistry
Sequential staining
Simultaneous staining
Multi-step technique
Chromogenic dyes
Fluorescent dyes
Immunofluorescence (IF)
Digital image analysis

Principles and Applications of Fluorescence

Fluorescence involves the absorption of excitation light and the rapid emission of light at a longer wavelength due to atomic structure and electron energy levels.

Fluorescence
Phosphorescence
Excitation peak
Photobleaching
Autofluorescence
Fluorescence compensation
Immunofluorescence
Fluorescence in situ hybridization (FISH)

Evolution of IHC Detection Methods

The IHC technique undergoes evolution and improvement through automated systems, multistain technologies, and digital scanning for quantitative pathology.

automated systems
chromogen
fluorescence
multistain technologies
digital scanning
image analysis algorithms
quantitative biomarker information
prognostic markers
predictive markers
companion diagnostics
personalized diagnostics

IHC Antibody Selection and Protocol Optimization

Selection of the Primary Antibody in IHC

The selection of the primary antibody and analytical conditions applied for the analyte significantly impact the immunohistochemistry result regarding diagnostic sensitivity and specificity.

Immunohistochemistry (IHC)
Primary antibody selection
Monoclonal antibodies
Polyclonal antibodies
Rabbit monoclonal antibodies
Diagnostic sensitivity
Diagnostic specificity
Antigen retrieval method
Technical optimization
Validation process
Tissue fixation
Signal-to-noise ratio
Cross-reaction
Epitope retrieval
Tissue microarrays (TMA)
Ready-to-use (RTU) antibodies

Immunohistochemistry Antibody Selection and Protocol Optimization

This content discusses the selection of primary antibodies and the optimization of immunohistochemistry protocols to ensure robustness and correctness in diagnostic settings.

Primary antibody selection
Immunohistochemistry (IHC) standardization
Ready-to-use (RTU) antibodies
Heat-induced antigen retrieval (HIER)
Enzymatic pre-treatment
Protocol robustness and correctness
Signal transfer and visual saturation
Qualitative and semi-quantitative IHC tests
Antigen expression levels
Validation and verification
Pre-analytical and analytical factors
High-level and low-level expression sites

Staining Protocol Optimization in IHC

Optimizing immunohistochemistry protocols requires managing tissue section thickness, incubation times, antigen retrieval, and the selection of appropriate high and low expression control tissues.

tissue section thickness
staining intensity
hematoxylin counterstaining
antigen retrieval
reproducibility
pre-analytical factors
control tissue selection
high expression (HE) structures
low expression (LE) structures
protocol verification
protocol validation

Staining Protocol Optimization in Immunohistochemistry

Optimizing immunohistochemistry protocols involves monitoring HE and LE structures within normal control tissue and managing pre-analytical factors to ensure diagnostic certainty and minimize false negative results.

HE and LE structures
Normal control tissue
Staining protocol optimization
Amplification steps
Signal to noise reaction
False negative results
Pre-analytical factors
Antigen retrieval
Fixation time
RTU solutions
Standardization
FFPE tissues

Immunohistochemistry Detection and Multi-Staining Methods

This text explores immunohistochemistry techniques including direct and indirect staining, avidin-biotin systems, polymer-based methods, and catalyzed signal amplification for tissue pathology.

Immunohistochemistry (IHC)
Direct and indirect staining methods
Avidin-biotin complex (ABC) method
Labeled streptavidin-biotin (LSAB) method
Polymer-based IHC techniques
Catalysed signal amplification (CSA)
Improved catalysed signal amplification (iCSA)
Multi-staining immunohistochemistry
Sequential staining
Simultaneous staining
Multi-step technique
Chromogenic dyes
Fluorescent dyes
Immunofluorescence (IF)
Digital image analysis

Principles and Applications of Fluorescence

This text explains the principles of fluorescence and phosphorescence, including the Stokes shift, photobleaching, and fluorescence compensation in detection methods.

fluorescence
phosphorescence
excitation wavelength
emission peak
photobleaching
autofluorescence
fluorescence compensation
immunofluorescence
fluorescence in situ hybridization

Immunohistochemistry Optimization, Automation, and Companion Diagnostics

Digital Pathology and Immunohistochemical Optimization

This content explores digital pathology technologies including slide scanning and image analysis alongside methods for optimizing immunohistochemical reactions through antigen retrieval and proteolytic digestion.

Digital Pathology
Microscopy
Telepathology
Slide Scanning
Z-stacking
Pyramidal format
Image Analysis and Quantification
Immunohistochemistry (IHC)
Assay Optimization
Heat-induced Epitope Retrieval (HIER)
Proteolytic Digestion
Antigen Retrieval

Optimization of Immunohistochemical Reactions

Methods for optimizing immunohistochemical reactions include using enzyme blockers, protein blocking reagents, biotin blocking, antibody diluents, incubation times, wash buffers, chromogen enhancers, and specific glass slides.

Endogenous enzyme blockers
Horseradish peroxidase
Alkaline phosphatase
Protein blocking reagents
Non-specific binding
Endogenous biotin
Antibody diluents
Antibody stability
Ionic strength
Incubation times
Wash buffers
Tris-buffered saline (TBS)
Phosphate-buffered saline (PBS)
DAB chromogen enhancers
Glass slides for tissue adherence

Automation in Immunohistochemistry Staining Methods

This text explores the history, technologies, and advantages of automated immunohistochemistry (IHC) staining compared to manual procedures.

Immunohistochemistry (IHC) automation
Manual staining
In situ hybridization (ISH)
Open individual slide system
Liquid overlay technology
Capillary gap staining
Dynamic gap staining
Open and closed systems
Sequential and parallel staining processes
Batch and continuous loading
Antigen retrieval
Staining protocols
Turnaround time (TAT)
Laboratory workflow

Optimizing Laboratory Workflow in IHC Staining

Assessment of laboratory workflow parameters including specimen tracking, LIS connectivity, and manual process reduction to improve throughput and minimize misidentification errors.

IHC pathology workflow assessment
Specimen tracking and identification
Laboratory Information System (LIS) connectivity
Specimen accessioning
Grossing optimization
Tissue processing and microtomy
Batch event processing vs trigger point transfer
Integrated staining platforms
Slide and block reconciliation
Laboratory asset tracking
Specimen labeling protocols

Companion Diagnostics and Drug Co-development

Companion diagnostics are in vitro diagnostic devices providing essential information for the safe and effective use of corresponding therapeutic products through predictive or selective characteristics.

Companion diagnostics (CDx)
In vitro diagnostic (IVD) devices
Predictive markers
Theranostics
Personalized medicine
Drug-diagnostic co-development
Clinical trial design
Untargeted/all-comers design
Targeted/enrichment design
Stratification/marker-by-treatment-interaction design
Analytical validation
Clinical validation
Biomarker identification
Immunohistochemistry (IHC)
Fluorescence in situ hybridization (FISH)
Clinical sensitivity and specificity
Positive predictive value (PPV)
Negative predictive value (NPV)

Evolution and Optimization of IHC and Digital Pathology

Evolution of IHC Detection Methods

The IHC technique undergoes evolution through automated systems, multistain technologies, and digital scanning to improve sensitivity, reproducibility, and quantification.

automated systems
chromogen
fluorescence
multistain technologies
digital scanning
image analysis algorithms
quantitative pathology
biomarker information
prognostic markers
predictive markers
companion diagnostics
personalized diagnostics

Digital Pathology and Immunohistochemical Optimization

This content explores digital pathology technologies, including slide scanning and image analysis, alongside the optimization of immunohistochemical reactions through antigen retrieval and enzyme blocking.

Digital pathology
Automated microscopy
Telepathology
Virtual slides
Slide scanning
Z-stacking
Pyramidal format
Image analysis and quantification
Immunohistochemistry (IHC)
Heat-induced epitope retrieval (HIER)
Proteolytic digestion
Endogenous enzyme blockers
Horseradish peroxidase
Alkaline phosphatase

Companion Diagnostics and Tissue Microarray Technology

Companion Diagnostics and Regulatory Aspects

Companion diagnostics (CDx) assays serve as gatekeepers for targeted cancer drugs, requiring specific analytical and clinical performance standards under regulatory frameworks like the FDA and EU.

Companion Diagnostics (CDx) assays
Regulatory frameworks
FDA PMA process
EU conformity assessment
Risk-based classification
Drug-diagnostic co-development
Analytical and clinical performance
In vitro diagnostic medical devices
EGFR expression
K-RAS mutation

Companion Diagnostics in Oncology Development

The development and regulatory approval of IHC or FISH-based companion diagnostic assays for personalized medicine and targeted cancer drugs.

Companion diagnostics
Immunohistochemistry
Fluorescence in situ hybridization
Personalized medicine
EGFR mutations
HER2 protein overexpression
Gene amplification
Next generation sequencing
Targeted anti-cancer drugs
Predictive biomarkers

Companion Diagnostics and Targeted Cancer Therapy

This document provides references regarding companion diagnostics, drug-diagnostic co-development models, and the use of predictive biomarkers in cancer therapy.

companion diagnostics
drug-diagnostic co-development
predictive biomarker validation
personalized medicine
targeted therapy
in vitro diagnostic assays
clinical trial designs
EGFR pathway
RAS/RAF signaling pathway
BRAF V600E mutation

Tissue Microarray Construction and Quality Assurance

This text describes the principles, advantages, disadvantages, and various types of tissue microarray (TMA) technology used for high-throughput analysis of patient samples.

Tissue microarray (TMA) principle
Immunohistochemical (IHC) methods
Cell line arrays
Tissue/tumor arrays
Consecutive case array
Tumor characteristic-based array
Progression arrays
Outcome-based arrays
TMA core size and number
Intratumoral heterogeneity
Donor and recipient blocks
TMA map and layout design
Validation and quality assurance
Slide analysis and data analysis

Companion Diagnostics and Regulatory Aspects

Companion diagnostics (CDx) assays serve as gatekeepers for targeted cancer drugs, requiring analytical and clinical performance standards under regulatory frameworks like the FDA and EU.

Companion Diagnostics (CDx) assays
Analytical and clinical performance
FDA PMA process
EU conformity assessment and CE marking
Risk-based classification
Drug-diagnostic co-development
In vitro diagnostic medical devices
EGFR expression and inhibitors
K-RAS mutation and resistance

Companion Diagnostics in Oncology Development

The development and regulatory approval of IHC or FISH-based companion diagnostic assays to select patients for targeted cancer drug treatment.

Companion diagnostics
Immunohistochemistry
Fluorescence in situ hybridization
Personalized medicine
EGFR mutations
HER2 protein overexpression
Gene amplification
Next generation sequencing
Targeted anti-cancer drugs
Predictive biomarkers

Tissue Microarray Construction and Quality Assurance

This text describes the principles, advantages, disadvantages, and various types of tissue microarray (TMA) technology used for high-throughput analysis of patient samples.

Tissue microarray (TMA) technology
Immunohistochemistry (IHC) validation
Core size and number strategies
Cell line arrays
Tissue/tumor arrays
Consecutive case arrays
Tumor characteristic-based arrays
Outcome-based arrays
TMA map and layout design
Donor and recipient blocks
Quality assurance and validation
Data cleaning and normalization

Optimizing IHC Staining and Laboratory Workflows

Optimization of Immunohistochemical Reactions

This text discusses the optimization of immunohistochemistry through protein blocking reagents, endogenous biotin management, antibody diluents, antibody concentrations, incubation times, and wash buffers.

Protein blocking reagents
Non-specific binding
Endogenous biotin
Streptavidin-biotin (LSAB) complex
Polymer visualizations
Antibody diluents
Epitope specificity
Ionic strength
Isoelectric point (pI)
Immunoglobulins
Incubation times
Wash buffers
Tris-buffered saline (TBS)
Phosphate-buffered saline (PBS)
Tween

Automation in Immunohistochemistry Staining Methods

This text discusses the history, advantages, and various staining technologies of automated immunohistochemistry (IHC) systems and their impact on laboratory workflow.

Immunohistochemistry (IHC) automation history
Open and closed staining systems
Open individual slide system
Liquid overlay technology
Capillary gap staining
Dynamic gap staining
Sequential vs. parallel staining processes
Batch vs. continuous loading
Staining solution components
Turnaround time (TAT)
Laboratory workflow optimization
In situ hybridization (ISH)

Optimizing Laboratory Workflow in IHC Staining

Assessment of parameters such as slide availability, stainer load capacity, and specimen tracking to improve laboratory workflow and reduce manual processes.

IHC pathology workflow
Specimen tracking
Laboratory Information System (LIS) connectivity
Specimen accessioning
Grossing optimization
Tissue processing and microtomy
Batch event processing
Trigger point transfer
Routine staining and coverslipping
Integrated staining platforms
Slide and block reconciliation
Laboratory asset tracking
Specimen identification systems
Barcode implementation

Companion Diagnostics and Drug Co-development

Companion diagnostics (CDx)
In vitro diagnostic (IVD) devices
Predictive markers
Theranostics
Personalized medicine
Drug-diagnostic co-development
Feasibility stage
Prototype stage
Analytical validation
Clinical validation
Untargeted/all-comers design
Targeted/enrichment design
Stratification/marker-by-treatment-interaction design
Clinical sensitivity and specificity
Positive predictive value (PPV)
Negative predictive value (NPV)
Immunohistochemistry (IHC)
Fluorescence in situ hybridization (FISH)

Fundamentals and Troubleshooting of Immunohistochemistry

Immunohistochemical Visualization of Molecular Tests

This chapter focuses on the immunohistochemical aspects of molecular testing for genetic aberrations in cancer using in situ hybridization techniques.

In situ hybridization (ISH)
Fluorescence in situ hybridization (FISH)
Chromogenic in situ hybridization (CISH)
Silver-enhanced in situ hybridization (SISH)
HER2 gene status
Gene amplification
Chromosomal copy number changes
Fluorescent probes
Chromogen deposition
Bright field microscopy
Fluorescence microscopy
Enzyme labeled antibody
Horseradish peroxidase (HRP)
Alkaline phosphatase (AP)
Hematoxylin counterstain

Immunohistochemistry Controls and Validation

This text describes the various categories of controls and validation procedures required to ensure the specificity, sensitivity, and reproducibility of immunohistochemical staining results.

reagent controls
positive tissue control
negative tissue control
internal tissue controls
tissue process control
cell line controls
on-slide positive tissue controls
antibody specificity
assay sensitivity
external quality assurance
proficiency testing
validation of new antibodies
reagent lot verification

Immunohistochemistry Background Staining Methods

This text discusses causes of background staining in immunohistochemistry, including unwanted specific staining and non-specific staining related to antibodies, detection methods, and endogenous peroxidase or alkaline phosphatase activity.

unwanted specific staining
non-specific staining
polymer-based detection methods
endogenous avidin/biotin
negative reagent control
horseradish peroxidase-based detection methods
endogenous peroxidase activity
quenching endogenous peroxidase activity
alkaline phosphatase-based detection methods
endogenous alkaline phosphatase activity
levamisole

Sources of Background in Immunohistochemistry

This text discusses various factors that cause non-specific background staining in immunohistochemical procedures, including endogenous activities, antibody characteristics, and physical interactions.

Endogenous peroxidase and alkaline phosphatase quenching
Endogenous avidin-binding activity (EABA)
Avidin-biotin-complex (ABC) binding
Antigen retrieval (Heat-Induced Epitope Retrieval)
Antigen diffusion
Natural and contaminating antibodies
Antibody cross-reactivity
Fc receptors (FcR)
Hydrophobic interaction
Ionic and electrostatic interactions
Complement-mediated binding
Protein blocking solutions

Immunohistochemistry Troubleshooting Guide

A guide for resolving common problems in immunohistochemistry including inadequate staining, general background staining, and limited background staining through systematic reagent testing and protocol optimization.

Immunohistochemistry (IHC) staining process
Inadequate staining causes
Background staining troubleshooting
Antigen retrieval methods
Endogenous peroxidase activity
Endogenous alkaline phosphatase activity
Endogenous biotin interference
Primary antibody dilution and concentration
Secondary antibody cross-reactivity
Tissue fixation and antigenicity
Enzyme blocking reagents
Chromogenic substrate preparation
Positive and negative reagent controls
Automated staining platforms
In vitro diagnostic (IVD) antibody specifications

Troubleshooting Automated IHC Staining Platforms

This guide provides information for troubleshooting automated IHC staining platform performance, including target retrieval conditions, reagent application, and contamination prevention.

Automated platform performance checks
Positive and negative control tissues
Target retrieval solution pH
Target retrieval temperature and time
Reagent volume and expiration
Probe contamination
Bacterial and fungal growth prevention
Inadequate probe wash
Bulk fluid supply monitoring
Instrument installation and environmental conditions

Structural and Biochemical Features of Antibodies and Antigens

This text covers the structural and biochemical features of antibodies, including immunoglobulin classes and antigen recognition through epitopes.

Immunoglobulins
Antibody structure
Heavy chains
Light chains
IgG subclasses
Fab fragments
Fc fragments
Antigens
Epitopes
Linear epitopes
Conformational epitopes
Haptens
Carrier proteins

Immunohistochemical Visualization of Molecular Tests

This chapter focuses on the immunohistochemical aspects of molecular testing for genetic aberrations in cancer using in situ hybridization techniques.

FISH
CISH
in situ hybridization
molecular testing
genetic aberrations
gene amplifications
deletions
translocations
chromosomal copy number changes
HER2 status
chromogenic detection
fluorescent probes
bright field microscopy
fluorescence microscopy
enzymatic deposition of chromogen
dual color CISH

Immunohistochemistry Staining Methods and Controls

This document describes the various categories of controls and measures used to validate immunohistochemical staining results and ensure diagnostic quality.

Immunohistochemistry staining variations
Reagent controls
Positive and negative tissue controls
Internal tissue controls
Tissue process control
Cell line controls
On-slide positive tissue controls
Tissue microarrays
External quality assurance programs
Validation of antibodies and protocols
Detection systems
Antigen retrieval

Immunohistochemistry Background Staining Causes and Solutions

This text covers the major causes of background staining related to antibodies, detection methods, and other general factors and offers possible solutions to these problems.

unwanted specific staining
non-specific staining
polymer-based detection methods
endogenous peroxidase activity
alkaline phosphatase-based detection methods
avidin-biotin-complex binding
endogenous avidin-binding activity
antigen retrieval
heat-induced epitope retrieval
antigen diffusion
natural antibodies
contaminating antibodies
antibody cross-reactivity
Fc receptors
hydrophobic interaction
ionic and electrostatic interactions
complement-mediated binding

Immunohistochemistry Troubleshooting Guide

A guide to resolving common problems in immunohistochemistry (IHC) staining including inadequate staining, general background, and limited background.

Immunohistochemistry (IHC) staining process
Inadequate staining causes
Background staining troubleshooting
Endogenous peroxidase activity
Endogenous alkaline phosphatase activity
Endogenous biotin interference
Antigen retrieval methods
Heat-induced epitope retrieval (HIER)
Primary antibody dilution and concentration
Secondary antibody cross-reactivity
Fixation and tissue processing effects
Chromogenic substrate-chromogen reagents
Negative reagent control preparation
Enzyme blocking reagents
Protein blocking
Biotin blocking

Troubleshooting Automated IHC Staining Platforms

Information regarding troubleshooting automated IHC staining platform performance, including target retrieval conditions, reagent management, and contamination control.

Automated platform performance checks
Positive and negative control tissues
Target retrieval solution and temperature
Target retrieval time
Reagent volume and expiration
Probe contamination
Bacterial and fungal growth
Inadequate probe wash
Bulk fluid supply
Immunohistochemical staining protocols

Antibody and Antigen Fundamentals in Immunohistochemistry

This text covers the structural and biochemical features of antibodies and antigens, including immunoglobulin classes, monoclonal and polyclonal antibody production, and antibody affinity.

Immunoglobulins
Antibody structure
Heavy and light chains
IgG subclasses
IgM pentamer structure
Antigenic determinants (epitopes)
Linear and conformational epitopes
Polyclonal antibodies
Monoclonal antibodies
Hybridoma technology
Antibody affinity and avidity
Cross-reactivity
Antibody stability and storage

Antibody Production and Immunohistochemistry Staining Methods

Polyclonal and Monoclonal Antibody Production

Comparison of polyclonal and monoclonal antibodies regarding epitope specificity, production methods, and immunological characteristics.

Polyclonal antibodies
Monoclonal antibodies
Epitope recognition
Hybridoma technology
B-cell clones
Immunization
Adjuvants
Purification methods
Antibody affinity and avidity
Cross-reactivity

Antibody Properties and Handling in Immunohistochemistry

This text discusses antibody affinity, cross-reactivity, reaction rates, stability, and storage requirements for immunohistochemistry.

intrinsic affinity
functional affinity
avidity
antibody cross-reactivity
antigen retrieval
antibody reaction rates
antibody stability
antibody storage and handling
monoclonal antibodies
polyclonal antibodies

Basic Immunohistochemistry Staining Methods

Immunohistochemistry staining quality is influenced by antibody titer, dilutions, incubation time, temperature, and pre-treatment of tissue samples.

Antibody titer
Antibody dilution
Incubation time
Incubation temperature
Monoclonal antibodies
Polyclonal antisera
Antigen retrieval
Signal to noise ratios
Enzymology in IHC
Horseradish peroxidase

Immunohistochemistry Staining Methods and Substrates

This text discusses peroxidase and alkaline phosphatase enzyme substrates, inhibitors, and chromogens used in immunohistochemistry staining.

Horseradish peroxidase (HRP)
Hydrogen peroxide quenching
DAB substrate
AEC substrate
Alkaline phosphatase (AP)
APAAP procedure
Levamisole inhibition
Fast Red TR
Fast Blue BB
New Fuchsin
BCIP

Basic Immunochemistry References and Methods

A collection of references regarding immunohistochemistry, monoclonal antibodies, and various labeling methods including peroxidase-antiperoxidase and avidin-biotin complex.

immunohistochemistry
monoclonal antibodies
heat-induced antigen retrieval
peroxidase-antiperoxidase
avidin-biotin complex
diaminobenzidine (DAB) polymer
glucose oxidase-antiglucose oxidase complexes
beta-galactosidase
double immunoenzymatic labeling
alkaline phosphatase
APAAP complexes

Basic Immunochemistry and IHC Staining Methods

This document describes immunochemistry methods for the detection and localization of proteins using antibodies, focusing on factors like antibody titer, dilution, incubation time, temperature, and enzyme substrate reactions.

Immunohistochemistry (IHC)
Antibody titer
Antibody dilution
Monoclonal antibodies
Polyclonal antisera
Incubation time
Incubation temperature
Antigen retrieval
Horseradish peroxidase (HRP)
Alkaline phosphatase (AP)
Chromogens
Substrate-chromogen mixtures
Endogenous enzyme activity

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