Precursor T-cell Lymphoma
Incidence:
30%
of all childhood NHL
80%
have T-cell markers:
3%
of all adult NHL
Diagnosis:
<25%
blasts in bone marrow
Blasts
in bone marrow resemble blasts of ALL
Cell markers:
Mass
above the diaphragm
TdT,
CD1, CD2, CD3, CD5, CD7
20%
have B-cell markers:
TdT,
CD19, CD22, CD20, CD10
Prognosis:
Overall
survival of 1 – 2 years