Dako Agilent is a world-leading supplier of immunohistochemistry (IHC) reagents, primary antibodies, detection systems, and FDA/CE-IVD-cleared companion diagnostic (PharmaDx) kits used in clinical pathology and oncology. Dako, now fully integrated into Agilent Technologies, provides the complete IHC workflow — from tissue pre-treatment and primary antibody incubation to chromogenic or fluorescent detection and counterstaining. Its PharmaDx portfolio includes companion diagnostics for therapies targeting PD-L1, HER2, ALK, ROS1, and EGFR, making Dako Agilent central to precision oncology decision-making in certified pathology laboratories worldwide, including in India.
The Dako Agilent Portfolio: Core Product Categories
Understanding the Dako Agilent product architecture is essential for laboratory procurement and quality assurance teams.
Primary Antibodies
Dako offers over 2,000 monoclonal and polyclonal antibodies optimised for formalin-fixed, paraffin-embedded (FFPE) tissue. Each antibody is validated against reference tissues with defined positive and negative controls, and is supplied with concentration and dilution guidance for manual and automated staining platforms.
Key antibodies used in routine surgical pathology include CD markers for haematolymphoid tumour classification, cytokeratins for carcinoma identification, and hormonal receptor markers (ER, PR) for breast cancer subtyping.
Autostainer Systems and Detection Chemistries
The Dako Omnis and Autostainer Link 48 platforms enable high-throughput, standardised IHC staining with programmable protocols. Detection systems include FLEX and EnVision+, both polymer-based and free from biotin-avidin interference that can produce false-positive signals in biotin-rich tissues such as liver and kidney.
PharmaDx Companion Diagnostics
This is arguably the most clinically critical segment of the Dako Agilent portfolio. PharmaDx kits are CE-IVD and FDA-cleared tests designed to identify patients most likely to benefit from specific targeted therapies:
- PD-L1 IHC 22C3 pharmDx: Validated for pembrolizumab eligibility in NSCLC, gastric, cervical, and urothelial carcinoma.
- HER2 FISH pharmDx: Dual-probe FISH kit for HER2 gene amplification status in breast and gastric cancers.
- ALK (D5F3) CDx Assay: Companion diagnostic for crizotinib and alectinib in ALK-positive NSCLC.
- EGFR PharmaDx: Detects EGFR protein expression in colorectal carcinoma.
These tests are not merely research tools — they are regulatory-cleared tests whose results directly determine treatment eligibility, underscoring the need for stringent quality assurance and validated staining protocols.
Dako Agilent vs. Competing IHC Platforms: A Comparative Overview
| Feature | Dako Agilent | Leica Biosystems | Ventana (Roche) |
| PharmaDx Portfolio | Comprehensive (PD-L1, HER2, ALK, EGFR) | Limited companion Dx | Broad (VENTANA OptiView) |
| Staining Platform | Omnis, Autostainer Link 48 | BOND-III, BOND-MAX | DISCOVERY ULTRA, BenchMark |
| Detection Chemistry | FLEX, EnVision+ Polymer | Polymer Refine | OptiView, ultraView |
| Antibody Catalogue | >2,000 validated antibodies | >1,500 antibodies | >1,200 antibodies |
| Automation Level | High (open and closed system) | High (closed system) | High (closed system) |
| Regulatory Clearance | FDA, CE-IVD, CAP PT | CE-IVD | FDA, CE-IVD |
Immunohistochemistry Workflow: Principle to Reporting
A rigorous IHC workflow using Dako Agilent reagents follows these sequential steps:
1. Tissue Fixation: 10% neutral buffered formalin (NBF) fixation for 6–72 hours at room temperature, critical for antigen preservation.
2. Deparaffinisation and Rehydration: Xylene and graded alcohols remove paraffin wax before antigen retrieval.
3. Heat-Induced Epitope Retrieval (HIER): Dako Target Retrieval Solution (pH 6.0 or 9.0) is used in a PT Link or similar pre-treatment module to unmask formalin-cross-linked antigens.
4. Endogenous Peroxidase Blocking: Hydrogen peroxide (Dako FLEX Peroxidase Block) prevents non-specific background staining.
5. Primary Antibody Incubation: Optimised concentrations and incubation times specified in each Dako antibody datasheet.
6. Detection: Polymer-based secondary detection (FLEX or EnVision+) amplifies signal with HRP-linked polymer.
7. Chromogen Development: Dako DAB+ (3,3′-diaminobenzidine) produces a brown precipitate at antibody-binding sites.
8. Counterstaining and Coverslipping: Haematoxylin counterstaining and xylene-based mounting medium complete slide preparation.
9. Scoring and Reporting: Pathologist evaluates staining intensity and extent against validated scoring algorithms (e.g., H-score, Allred score, TPS for PD-L1).
Quality Control in Dako Agilent IHC
Quality control is non-negotiable in IHC, particularly for companion diagnostics. Key QC requirements for laboratories using Dako Agilent reagents include:
- Run Controls: Every staining run must include positive and negative tissue controls on the same slide batch.
- Reagent Lot Validation: Each new antibody lot must be validated against the previous lot using reference tissue to confirm equivalent staining intensity.
- Calibration of Pre-treatment Equipment: PT Link and water bath temperature calibration records must be maintained for NABL/ISO 15189 compliance.
- External Quality Assessment (EQA): Participation in NordiQC or equivalent EQA schemes is strongly recommended for accredited pathology laboratories.
DSS Imagetech provides application training and SOP development support for laboratories establishing or optimising IHC workflows with Dako Agilent reagents.
Procurement and Storage Considerations
Most Dako Agilent immunohistochemistry reagents are stored at 2–8°C and are supplied ready-to-use in optimised formulations. Cold chain logistics are critical, particularly for institutions in Tier-2 and Tier-3 cities. DSS Imagetech manages import clearance, cold chain transport, and inventory management for institutional buyers across India.
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