Gastrointestinal lymphomas. Immunohistologic study of 23 cases

Area of Science:

• Gastroenterology
• Oncology
• Immunology

Background:

• Gastrointestinal lymphomas are a diverse group of neoplasms requiring accurate classification.
• Morphological and immunological assessments are crucial for diagnosing these conditions.

Purpose of the Study:

• To evaluate the diagnostic utility of morphological and immunological studies on fresh frozen tissue and cell suspensions of primary gastrointestinal lymphomas.
• To compare the diagnostic accuracy of fresh frozen tissue analysis versus fixed endoscopic biopsies.

Main Methods:

• Studied 23 primary gastrointestinal lymphomas using morphology and immunology on fresh frozen tissue.
• Utilized polyclonal antibodies for immunoglobulin chains and 16 monoclonal antibodies for B-cells, T-cells, histiocytes, and epithelial cells.
• Performed cell suspension analysis on 16 cases.

Main Results:

• Classified cases according to the Working Formulation: 5 low grade, 12 intermediate grade, 5 high grade, and 1 extramedullary plasmocytoma.
• Identified 47% large cell lymphomas and 13% follicular lymphomas.
• Confirmed 20 (86%) B-cell lymphomas and 2 T-cell lymphomas; one case was unclassifiable.
• Demonstrated monoclonality in 13 of 20 B-cell lymphomas.

Conclusions:

• Immunological studies on fresh frozen surgical material offer precise diagnostic value for gastrointestinal lymphomas.
• Fixed endoscopic biopsies are limited, primarily enabling differentiation between lymphomas and undifferentiated carcinomas.