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Practical issues related to immunocytochemistry on cytological smears: Tips and recommendations
Maria D Lozano1, Allan Argueta1, Ramón Robledano1
1Department of Pathology, Clínica Universidad de Navarra, Pamplona, Spain.
Insights
Immunocytochemistry (ICC) on cytological smears is a viable alternative to cell blocks when properly prepared and fixed. This review provides practical protocols to optimize ICC staining on smears for improved diagnostic accuracy.
Area of Science:
- Histopathology
- Cytopathology
- Immunohistochemistry
Background:
- Immunocytochemistry (ICC) is crucial for cancer diagnosis, prognosis, and targeted therapy selection.
- Cell blocks (CBs) offer standardization for ICC, but cytological smears are used when CBs are unavailable.
- Limited literature exists on ICC protocols specifically for cytological smears.
Purpose of the Study:
- To review and provide practical protocols for immunocytochemistry on cytological smears.
- To address preparation, fixation, and staining protocols for nuclear and cytoplasmic antibodies on smears.
- To share laboratory experience in optimizing ICC on cytological smears.
Main Methods:
- Review of existing literature on ICC protocols for cytological specimens.
- Incorporation of practical insights and protocols from the authors' laboratory experience.
- Focus on preparation, fixation, and antibody staining procedures for smears.
Main Results:
- Commercially available antibodies demonstrate reliability for ICC on smears with proper specimen preparation and fixation.
- Laboratory-developed protocols successfully maintained antigenicity and yielded clear staining results.
- Established protocols ensure successful ICC staining on cytological smears.
Conclusions:
- Cytological smears are a practical alternative for ICC when cell blocks are not feasible.
- Proper specimen preparation and fixation are critical for successful ICC on smears.
- This review offers valuable protocols and insights for optimizing ICC on cytological smears, though further standardization is needed.
Objective:
Immunocytochemistry (ICC) is essential for enhancing diagnostic accuracy and identifying markers for diagnosis, prognosis and targeted therapies. While cell blocks (CBs) are preferred for standardization and optimized staining, cytological smears are an alternative when CBs are unavailable. However, the literature on ICC protocols for smears is sparse. This review addresses preparation, fixation and protocols for nuclear and cytoplasmic antibodies on smears, drawing from our laboratory's experience.
Methods:
We reviewed procedures for ICC on cytological smears using existing literature and practical insights from our laboratory.
Results:
Commercially available antibodies were found to be reliable for ICC on smears if specimens are properly prepared and fixed. Protocols developed in our laboratory maintained antigenicity and provided clear staining results.
Conclusions:
Although ICC on CBs is the gold standard for standardization, cytological smears are a viable alternative when CBs are unavailable. Success in ICC on smears depends on proper preparation and fixation. This review offers practical protocols and insights to help laboratories optimize ICC on cytological smears. Further research and standardization are necessary to enhance reproducibility and reliability of ICC on smears. The practical information provided is based on personal experience in our laboratory.
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