Diagnosis of mature B cell malignancies is highly multidisciplinary. Biological tools provide diagnostic, prognostic and theranostic information. Biological hematology allows considering mature B cell diseases from two perspectives : cellular and molecular approaches. Cytomorphology and flow cytometry are tools from cell hematology. Conventional cytogenetics, FISH and molecular biology are tools from molecular hematology. NGS is a new technique that could dramatically change diagnostic and therapeutic management of B cell malignancies in the near future. Integration of clinical, pathological and biological data allows for personalized management of these diseases.
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