RESUMEN
BACKGROUND: Epstein-Barr virus (EBV) infection has been associated with Richter transformation in patients with chronic lymphocytic leukemia (CLL). METHODS: A direct isothermal mRNA amplification method was developed for detection of EBV latent membrane protein 1 (LMP1) mRNA transcriptional activity in the peripheral blood of 135 chronic lymphocytic leukemia patients and 98 hematologically healthy control subjects. RESULTS: EBV LMP1 mRNA transcripts were found in 19 of 135 (14%) of the CLL cases, but only 1% of the healthy controls (P < .0001). In contrast, 23 solid tumor patients tested negative for EBV LMP1 transcripts. In a later cohort of patients after hematopoietic stem cell transplantation, 4 of 7 patients with Hodgkin lymphoma or Burkitt lymphoma had EBV LMP1 detected. In a preliminary analysis, outcome data were available for 88 of the 135 patients with CLL. EBV LMP1 mRNA positivity was associated with a significantly increased degree of histologically demonstrated bone marrow involvement by CLL (P = .003, Mann-Whitney U test). CONCLUSIONS: EBV LMP1 mRNA transcriptional activity was observed in a significant proportion of CLL patients. Transcription of the EBV LMP1, a late gene with known transforming potential in vitro, suggests that EBV activation plays a role in CLL disease progression. Thus, EBV LMP1 expression in CLL patients may be a factor involved in the genesis of refractory disease.
Asunto(s)
Leucemia Linfocítica Crónica de Células B/virología , Proteínas de la Matriz Viral/metabolismo , Adulto , Anciano , Anciano de 80 o más Años , Médula Ósea/metabolismo , Médula Ósea/patología , Médula Ósea/virología , Línea Celular Tumoral , Femenino , Humanos , Leucemia Linfocítica Crónica de Células B/sangre , Leucemia Linfocítica Crónica de Células B/patología , Masculino , Persona de Mediana Edad , ARN Mensajero/metabolismo , ARN Viral/metabolismo , Proteínas de la Matriz Viral/sangreRESUMEN
Nocardia is an infrequent but significant cause of infections in the immunocompromised host. Clinical syndromes are varied and ranges from pulmonary, disseminated, cutaneous, and CNS involvement. Here we describe a case of disseminated subcutaneous nodules in a patient with multiple myeloma caused by Nocardia farcinica. The diagnosis was made by FNA biopsy which revealed gram positive filamentous bacilli in background of acute inflammation on smears. This was confirmed by 16S ribosomal gene sequencing. Prompt identification of N. farcinica is important because of its intrinsic resistance to broad spectrum cephalosporins and high risk of dissemination.