title: Philadelphia-positive T-ALL in a patient with follicular lymphoma.
abstract: Follicular lymphoma is a B cell malignancy prone to transformation into a large cell diffuse histology. This progression may be multi-clonal as determined by IgH rearrangement. Similar multi-clonal occurrences have been described in immunocompromised patients. However, the lymphoma cells remain predominantly of B cell type. Rarely, composite lymphomas with diffuse T cell histology have been reported arising from follicular lymphoma. The development of T cell leukaemia in a patient with a pre-existing B cell malignancy is an extremely rare event. The occurrence of T cell acute lymphoblastic leukaemia (T-ALL) following follicular lymphoma (FL) has not previously been reported. We report a case of Philadelphia positive (Ph+) T cell ALL developing in a patient who previously had FL which may give some insight into the cell of origin and the defects responsible for malignant transformation of the lymphocytes.
authors: Department of Haematology, Birmingham Heartlands Hospital, UK.
authors: R L
authors: RL
authors: Auer
authors: J
authors: J
authors: Oates
authors: S
authors: S
authors: Reid
authors: C D
authors: CD
authors: Fegan
authors: D W
authors: DW
authors: Milligan
mesh_terms: D000328:Adult; D006801:Humans; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000209:etiology* / Q000235:genetics; D008224:Lymphoma, Follicular / Q000150:complications*; D008297:Male; D010677:Philadelphia Chromosome