RESUMEN

Transformation from follicular lymphoma (FL) to high-grade B-cell lymphoma/leukemia (BLL) has been reported in patients with additional translocations involving the c-MYC gene. The previously reported cases were related to t(8;14) and t(8;22) but not to t(2;8). Herein is reported an FL that terminated in BLL following additional t(2;8). In accordance with previous reports, increased expression of c-MYC was observed in the present case but, interestingly, BCL-2 expression was inversely decreased after the transformation. In addition, the cell-surface immunoglobulin light-chain of lymphoma cells was initially kappa type and was then gradually replaced with the lambda type after transformation. Downregulation of BCL-2 and light-chain switch have rarely been reported in previous cases of FL transformation involving c-MYC, suggesting that additional t(2;8) translocation may play a role in these events.

Asunto(s)

Cadenas Ligeras de Inmunoglobulina/inmunología , Linfoma Folicular/patología , Neoplasias Primarias Secundarias/patología , Leucemia-Linfoma Linfoblástico de Células Precursoras/patología , Proteínas Proto-Oncogénicas c-bcl-2/biosíntesis , Proteínas Proto-Oncogénicas c-myc/biosíntesis , Biomarcadores de Tumor/análisis , Transformación Celular Neoplásica/genética , Aberraciones Cromosómicas , Cromosomas Humanos Par 2 , Cromosomas Humanos Par 8 , Femenino , Citometría de Flujo , Genes myc/genética , Humanos , Inmunohistoquímica , Linfoma Folicular/genética , Persona de Mediana Edad , Neoplasias Primarias Secundarias/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Proteínas Proto-Oncogénicas c-myc/genética , Translocación Genética