Granular lymphocytic leukemia derived from gamma delta T-cell expressing cytotoxic molecules.
We here present an extremely rare case of granular lymphocytic leukemia derived from gamma delta T-cell (gamma delta T-GLL). The blood picture at diagnosis was as follows; white cell count 25.7 x 10(9)/l containing 94% atypical lymphocytes with cytoplasmic granules, hemoglobin 11.8 g/dl and platelet count 124 x 10(9)/l. The atypical lymphocytes were positive for CD2, CD3, CD5, CD7, CD56 and TCR gamma delta, but negative for CD4, CD8, CD57, TCR alpha beta and B-cell antigens. The cytotoxic molecules, T-cell intracellular antigen-1 (TIA-1) and granzyme B, were positive by immunocytochemical analysis. Southern blot analysis showed rearrangement of T-cell receptor J gamma and C beta genes but germline configuration of the JH gene. Neither serum antibody against human T-cell leukemia virus type-I (HTLV-I) nor the integration of HTLV-I proviral DNA was detected. CT scan showed splenomegaly but no lymph node enlargement. A diagnosis of gamma delta T-GLL was made, and she has been followed up without any therapies for more than 4 years.
Saito
T
T
Hematology Division, National Cancer Center Hospital, 5-1-1, Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
Togitani
K
K
Murakami
J
J
Watanabe
T
T
Tanosaki
R
R
Kobayashi
Y
Y
Matsuno
Y
Y
Tobinai
K
K
D005260:Female; D016694:Gene Rearrangement, delta-Chain T-Cell Antigen Receptor; D015334:Gene Rearrangement, gamma-Chain T-Cell Antigen Receptor; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics* / Q000473:pathology; D015458:Leukemia, T-Cell / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D008875:Middle Aged; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000235:genetics / Q000378:metabolism*; D013602:T-Lymphocytes, Cytotoxic / Q000378:metabolism / Q000473:pathology
D016692:Receptors, Antigen, T-Cell, gamma-delta