Oral follicular lymphoma: a clinicopathologic and molecular study

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de Souza, Lucas Lacerda ; de Caceres, Cinthia Veronica Bardalez Lopez ; Sant'Ana, Maria Sissa Pereira ; Penafort, Paulo Victor Mendes ; de Andrade, Bruno Augusto Benevenuto ; Pontes, Helder Antonio Rebelo ; de Castro, Wagner Henriques ; Mesquita, Ricardo Alves ; Xavier Jr, Jose Candido Caldeira ; Santos-Silva, Alan Roger ; Lopes, Marcio Ajudarte ; Soares, Ciro Dantas ; Robinson, Liam ; van Heerden, Willie F. P. ; Burbano, Rommel Mario Rodriguez ; Assis-Mendonca, Guilherme Rossi ; Vassallo, Jose ; de Sousa, Silvia Ferreira ; Vargas, Pablo Agustin ; Fonseca, Felipe Paiva

• Document type: Journal article
• Source: JOURNAL OF HEMATOPATHOLOGY; v. 16, n. 4, p. 10-pg., 2023-11-02.

Abstract

Follicular lymphoma is a hematolymphoid neoplasm that originates from germinal center B cells. It is made up of a combination of small cleaved centrocytes and a varying quantity of larger non-cleaved centroblasts to describe the clinical, microscopic, immunohistochemical, and molecular features of oral follicular lymphomas. Follicular lymphomas affecting the oral cavity were retrieved from pathology files. Immunohistochemistry was performed to confirm the diagnosis, and fluorescence in situ hybridization (FISH) was employed to detect rearrangements in BCL2, BCL6, and MYC genes. Clinical and follow-up data were obtained from the patient's medical and pathology files. Twenty cases were obtained. There was an equal sex distribution (10 males: 10 females) and a mean age of 60.9 years (range: 10-83 years-old). Lesions presented as asymptomatic swellings, usually in the palate (10 cases) and the buccal mucosa (7 cases). Five patients presented with concomitant nodal involvement. Microscopic evaluation depicted the follicular growth pattern with diffuse areas in six cases. Grades 1 and 2 follicular lymphomas represented 12 cases, while grade 3A neoplasms accounted for other 8 cases. Two cases showed rearrangements in MYC, BCL2, and BCL6 genes, while single BCL2 translocation was found in eight cases. Two cases had no translocation. Three patients deceased and the 2-year overall survival achieved 88%. Follicular lymphoma affecting the oral cavity is uncommon, usually affects the palate as a non-ulcerated swelling and the presence of a systemic disease most always be ruled out. (AU)

• FAPESP's process: 22/03123-5 - ARTIFICIAL INTELLIGENCE IN THE DIAGNOSIS OF SMALL, ROUND AND BLUE CELL NEOPLASMS
• Grantee: Lucas Lacerda de Souza
• Support Opportunities: Scholarships in Brazil - Doctorate