Prethymic Cytoplasmic CD3 Negative Acute Lymphoblastic Leukemia or Acute Undifferentiated Leukemia: A Case Report
Table 1
T-ALL EGIL classification of T lineage acute lymphoblastic leukemia (T-ALL) modified by Szczepanski et al. [2].
MARKERS
Pro-T-ALL (EGIL T-I)
Immature thymocyte (EGIL T-II)
Common thymocytic T-ALL mCD3-(Cortical T-ALL, EGIL T-III)
Common thymocytic T-ALL mCD3+ (Cortical T-ALL, EGIL T-III)
Mature T-ALL (EGIL T-IV)
TdT
++
++
++
++
++
HLA-DR
+
−
−
−
−
CD34
+
−
−
−
−
CD1a
−
−
++
++
−
CD2
+
++
++
++
++
cyCD3
++
++
++
++
++
CD5
−
++
++
++
++
CD7
++
++
++
++
++
CD4−CD8−
++
+
−
−
−
CD4+CD8−
−
+/−
+/−
+/−
+
CD4−CD8+
−
+/−
+/−
+/−
+/−
CD4+CD8+
−
−
+
+
+/−
mCD3
−
−
−
++
++
TcR
−
−
−
60–70%
60–70%
TcR
−
−
−
30–40%
30–40%
<10% of the leukaemias are positive; +/−: 10–25% of the leukaemias are positive; +: 25–75% of the leukaemias are positive; ++: >75% of the leukaemias are positive.