Panel Sequencing of Primary Cutaneous B-Cell Lymphoma

Area of Science:

• Oncology
• Dermatology
• Genetics

Background:

• Primary cutaneous follicular B-cell lymphoma (PCFBCL) is an indolent non-Hodgkin's lymphoma.
• PCFBCL typically presents as slow-growing skin tumors with frequent relapses but low systemic spread.
• Limited research exists on the molecular mutations driving PCFBCL.

Purpose of the Study:

• To investigate the molecular pathogenesis of PCFBCL.
• To identify specific molecular features for differentiating PCFBCL from other cutaneous lymphomas.

Main Methods:

• Hybridization-based panel sequencing of 40 lymphoma-associated genes in 10 PCFBCL cases.
• Analysis of two ambiguous B-cell lymphoma cases using the same gene panel.

Main Results:

• Genetic alterations were found in 15 genes across 10 PCFBCL cases.
• Frequent mutations affected TNFRSF14, CREBBP, STAT6, and TP53 genes.
• Novel BCL2 gene mutations were identified in PCFBCL; FAS gene mutations suggested PCMZL in ambiguous cases.

Conclusions:

• Distinct somatic mutations in PCFBCL can aid in its differentiation from pseudo-lymphoma and other cutaneous B-cell lymphomas.
• While not prognostic in this cohort, these molecular findings offer diagnostic value.
• FAS gene mutations helped diagnose two ambiguous cases as primary cutaneous marginal zone lymphoma (PCMZL).