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Immunocytochemical staining on ThinPrep processed smears
1Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada.
Insights
The ThinPrep processor is effective for immunocytochemical staining of various specimens, offering clearer interpretation due to reduced background staining. However, it presents challenges in classifying lymphomas using immunotyping.
Area of Science:
- Cytopathology
- Immunohistochemistry
- Medical Diagnostics
Background:
- Immunocytochemical staining is crucial for diagnosing various conditions.
- Traditional cytological preparations can present challenges in interpretation.
- The ThinPrep processor offers a method for preparing cytological smears.
Purpose of the Study:
- To evaluate the efficacy of the ThinPrep processor for immunocytochemical staining.
- To assess the quality of staining and ease of interpretation using ThinPrep smears.
- To identify limitations of the ThinPrep method in immunocytochemical analysis.
Main Methods:
- Applied avidin-biotin-complex technique to 70 ThinPrep-processed cytological specimens.
- Utilized a panel of 20 antibodies for immunocytochemical staining.
- Included fine-needle aspiration samples, body fluids, and urine specimens.
Main Results:
- Demonstrated various antigens effectively in ThinPrep smears.
- Observed virtually absent nonspecific background staining.
- Found monolayer preparation facilitated easier interpretation compared to conventional methods.
- Encountered difficulties in lymphoma classification due to inconclusive immunotyping.
Conclusions:
- ThinPrep processor-prepared smears are suitable for immunocytochemical studies.
- The method enhances clarity and reduces background noise in staining.
- Limitations exist for lymphoma immunotyping, requiring further investigation.
Abstract:
This study reports our first-year experience in the immunocytochemical staining of specimens prepared by the ThinPrep processor. The avidin-biotin-complex technique was applied to smears of 70 cytological specimens, including fine-needle aspiration samples from various sites (56 specimens), body fluids (13 specimens) and urine (one specimen). The specimens were collected in CytoLyt solution to lyse red blood cells and then resuspended in the processing solution. The smears were made by the processor and fixed in 95% alcohol. The panel of antibodies used included alpha-fetoprotein, carcinoembryonic antigen, cytokeratin, chromogranin A, HMB-45, beta-human chorionic gonadotropin (beta-HCG), Kappa, Lambda, Ki-1, leucocyte common antigen, L26, neuron-specific enolase, 013, prostatic acid phosphatase, prostatic-specific antigen, S100, thyroglobulin, UCHL-1, and vimentin. The various antigens could be easily demonstrated in the ThinPrep smears, except for some lymphoma markers. Nonspecific background staining caused by blood and proteinaceous debris was virtually absent. In general, the monolayer preparation made the interpretation easier than conventional preparations. The only problem with this technique was in the classification of lymphomas where immunotyping was inconclusive. Our preliminary results indicate that ThinPrep smears are suitable for immunocytochemical studies, except for the classification of lymphomas.