Identification of leptomeningeal disease in aggressive B-cell non-Hodgkin's lymphoma: improved sensitivity of flow cytometry
Quijano S, López A, Manuel Sancho J, Panizo C, Debén G, Castilla C, Antonio García-Vela J, Salar A, Alonso-Vence N, González-Barca E, Peñalver FJ, Plaza-Villa J, Morado M, García-Marco J, Arias J, Briones J, Ferrer S, Capote J, Nicolás C, Orfao A; Spanish Group for the Study of CNS Disease in NHL. Collaborators (22) Rodríguez-Otero P, Pérez-Ceballos E, Monteserin MC, Diaz-Arias J, Pérez M, Domingo-Domenech E, Poderós C, Provencio M, Vallejo C, Forés R, Gómez E, de la Cruz M, Palacios A, Fernández S, Marin M, Hernández JA, Molero T, Romero-Picos E, Mateos MC, Peñarrubia M, Caballero D, Conde E.
Servicio General de Citometría, Department of Medicine and Centro de Investigación del Cáncer (CIC; USAL/CSIC), Universidad de Salamanca, Salamanca, Spain
Here, we evaluate the sensitivity and specificity of a new 11-parameter flow cytometry (FCM) approach versus conventional cytology (CC) for detecting neoplastic cells in stabilized CSF samples from newly diagnosed aggressive B-cell non-Hodgkin's lymphoma (B-NHL) at high risk of CNS relapse, using a prospective, multicentric study design.
PATIENTS AND METHODS
Moreover, we compared the distribution of different subpopulations of CSF leukocytes and the clinico-biologic characteristics of CSF+ versus CSF-, patients, in an attempt to define new algorithms useful for predicting CNS disease. RESULTS Overall, 27 (22%) of 123 patients showed infiltration by FCM, while CC was positive in only seven patients (6%), with three other cases being suspicious (2%). CC+/FCM+ samples typically had more than 20% neoplastic B cells and/or >or= one neoplastic B cell/microL, while FCM+/CC- samples showed lower levels (P < .0001) of infiltration. Interestingly, in Burkitt lymphoma, presence of CNS disease by FCM could be predicted with a high specificity when increased serum beta2-microglobulin and neurological symptoms coexisted, while peripheral blood involvement was the only independent parameter associated with CNS disease in diffuse large B-cell lymphoma, with low predictive value.
FCM significantly improves the sensitivity of CC for the identification of leptomeningeal disease in aggressive B-NHL at higher risk of CNS disease, particularly in paucicellular samples.
CITATION J Clin Oncol. 2009 Mar 20;27(9):1462-9