EORTC classification for primary cutaneous lymphomas: a comparison with the R.E.A.L. Classification and the proposed...

Area of Science:

• Dermatology
• Hematology
• Oncology

Background:

• Primary cutaneous lymphomas (PCLs) exhibit distinct clinical behaviors and prognoses compared to nodal lymphomas.
• Current non-Hodgkin lymphoma classifications inadequately address the unique characteristics of PCLs, leading to misdiagnosis and inappropriate treatment.

Purpose of the Study:

• To present the European Organization for Research and Treatment of Cancer (EORTC) Classification for primary cutaneous lymphomas.
• To highlight the clinical significance and validation of the EORTC Classification.
• To discuss controversies between the EORTC, R.E.A.L., and proposed WHO classifications.

Main Methods:

• Development of a classification system based on integrated clinical, histological, immunophenotypical, and genetic criteria.
• Validation of the classification through long-term follow-up data from over 800 patients with PCLs.
• Comparative analysis with existing classification systems (R.E.A.L. and proposed WHO).

Main Results:

• The EORTC Classification defines distinct PCL entities, primarily cutaneous T-cell and B-cell lymphomas (comprising >95% of cases).
• Long-term follow-up data confirmed the clinical validity and prognostic relevance of the EORTC Classification.
• The classification provides a framework for more accurate diagnosis and tailored therapeutic approaches.

Conclusions:

• The EORTC Classification offers a standardized and clinically validated approach to diagnosing and managing primary cutaneous lymphomas.
• This dedicated classification addresses the limitations of general lymphoma systems, aiming to prevent misdiagnosis and suboptimal treatment.
• The proposed EORTC system facilitates a better understanding and consistent management of PCLs globally.