Morphological and functional differentiation and classification of cutaneous lymphomas

Area of Science:

• Dermatopathology
• Immunohistochemistry
• Oncology

Background:

• Cutaneous lymphomas require precise classification for effective treatment.
• Histopathological evaluation alone can be insufficient for accurate diagnosis.

Purpose of the Study:

• To reevaluate the histo- and cytomorphology of cutaneous lymphomas.
• To differentiate between malignant lymphomas and pseudolymphomas using advanced techniques.
• To classify lymphomas based on integrated clinicopathological, enzymecytochemical, and immunological features.

Main Methods:

• Histological staining (HE, Giemsa, PAS, Gormori) and enzyme histochemistry (hydrolytic enzymes, peroxidase) on skin biopsies.
• Immunophenotyping of B and T cell surface markers in cell suspensions.
• Functional assays including phytohemagglutinin (PHA) response and intracytoplasmic immunoglobulin detection.

Main Results:

• Cutaneous lymphomas were classified within the "Kiel" classification system.
• Distinct histological patterns were identified for low-grade B-cell and T-cell lymphomas.
• Enzymecytochemical and immunological profiles correlated with histological subtypes.

Conclusions:

• Integrated diagnostic approaches enhance the accuracy of cutaneous lymphoma classification.
• Low-grade B-cell and T-cell lymphomas exhibit specific histological features.
• Microenvironmental specificity plays a role in the distinct patterns observed in cutaneous B-cell and T-cell lymphomas.