부산대학교 도서관

Introduction Central nervous system ( CNS) involvement in acute lymphoblastic leukemia ( ALL) is diagnosed traditionally by cytopathology ( CP) of the cerebrospinal fluid ( CSF). Role of flow cytometry ( FC) to diagnose CNS involvement has not been extensively investigated. Methods We aimed to detect CNS involvement in 42 ALL patients (33 B- ALL, nine T- ALL) at diagnosis by FC and comparing it with CP and to correlate it with known risk factors for CNS disease like Lactate dehydrogenase ( LDH). A receiver operating characteristic curve was used to determine the cutoff of LDH to predict CSF involvement. For the analysis of categorical/quantitative variables, Fisher's exact test was used. For the analysis of continuous variables, Mann-Whitney test was used. A P value of <.05 was taken as significant. Results CP and FC were positive in five (11.9%) and 11 patients (26.14%) respectively with FC detecting a significantly higher level of involvement ( P=.001). All CP-positive cases were FC positive. A LDH value of >472 U/L had a sensitivity of 61% and specificity of 62.5% for diagnosis of CSF involvement by FC. Conclusions CSF FC detects CNS disease in ALL patients at diagnosis at a rate double than CP alone and is statistically associated with an elevated LDH level. It should be incorporated in the evaluation of CSF to detect CNS involvement. [ABSTRACT FROM AUTHOR]