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Absence of memory B cells
Complete lack of memory B cells, that is, of mature B cell type that is long-lived, readily activated upon re-encounter of its antigenic determinant, and has been selected for expression of higher affinity immunoglobulin. [from HPO]
Neoplasm of mature B-cells
A neoplasm that arises from mature B-lymphocytes or plasma cells. Representative examples include mature B-cell non-Hodgkin lymphomas, chronic lymphocytic leukemia, hairy cell leukemia, plasma cell neoplasms, and B-cell proliferations of uncertain malignant potential. [from NCI]
B-cell acute lymphoblastic leukemia
The most frequent type of acute lymphoblastic leukemia. Approximately 75% of cases occur in children under six years of age. This is a good prognosis leukemia. In the pediatric age group the complete remission rate is approximately 95% and the disease free survival rate is 70%. Approximately 80% of children appear to be cured. In the adult age group the complete remission rate is 60-85%. (WHO, 2001) [from NCI]
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