Quantitation and estimation of lymphocyte subsets in tissue sections. Comparison with flow cytometry

Area of Science:

• Immunology
• Oncology
• Pathology

Background:

• Accurate quantitation of lymphocyte subsets is crucial for diagnosing and monitoring non-Hodgkin's lymphoma.
• Traditional methods like flow cytometry have limitations, including cell fragility and fluorescence intensity issues.

Purpose of the Study:

• To compare a novel immunoperoxidase-stained frozen tissue section quantitation method with flow cytometry for lymphocyte subset analysis in non-Hodgkin's lymphoma.
• To evaluate the precision and accuracy of the tissue quantitation method, especially at low cell values.

Main Methods:

• A quantitation method for immunoperoxidase-stained frozen tissue sections was developed and applied to 23 non-Hodgkin's lymphoma cases.
• Results were compared with those obtained from fluorescence-activated cell sorter (FACS) analysis.
• A simpler, faster estimation method using 10% intervals was also assessed.

Main Results:

• The tissue quantitation method demonstrated close correlations with FACS, validating its accuracy.
• The tissue method showed superior precision compared to FACS, particularly for low lymphocyte subset values.
• The simpler estimation method correlated as well with FACS as the primary quantitation method and yielded the best interobserver agreement.

Conclusions:

• Immunoperoxidase-stained tissue sections offer a reliable and precise method for quantifying lymphocyte subsets in non-Hodgkin's lymphoma.
• This technique is particularly advantageous for analyzing low cell counts where FACS may be less accurate.
• A simplified estimation approach enhances practicality and interobserver reliability in clinical settings.