A Case of CD4(+)T-Cell Large Granular Lymphocytic Leukemia

We report here a case of a 59-yr-old man with CD4(+) T-cell large granular lymphocytic leukemia (T-LGL). Peripheral blood examination indicated leukocytosis (45×10(9) cells/L) that consisted of 34% neoplastic lymphoid cells. Other laboratory results indicated no specific abnormalities except for serum antinuclear antibody titer (1:640), glucose (1.39 g/L), and hemoglobin A1c (7.7%) levels. Computed tomography indicated multiple small enlarged lymph nodes (<1 cm in diameter) in both the axillary and inguinal areas, a cutaneous nodule (1.5 cm in diameter) in the left suboccipital area, and mild hepatosplenomegaly. Bone marrow examination revealed hypercellular marrow that consisted of 2.4% neoplastic lymphoid cells. The neoplastic lymphoid cells exhibited a medium size, irregularly shaped nuclei, a moderate amount of cytoplasm, and large granules in the cytoplasm. Immunohistochemical analysis indicated CD3(+), CD4(+), T-cell receptor βF1(+), granzyme B(+), and TIA1(+). Flow cytometric analysis of the neoplastic lymphoid cells revealed CD3+, cytoplasmic CD3(+), CD4(+), and CD7(+). Cytogenetic analysis indicated an abnormal karyotype of 46,XY,inv(3)(p21q27),t(12;17)(q24.1;q21),del(13)(q14q22)[2]/46,XY[28]. The patient was diagnosed with CD4(+) T-LGL and received chemotherapy (10.0 mg methotrexate). This is the second case of CD4(+) T-LGL that has been reported in Korea.