Table 1.

Clinical features of six patients with aggressive NK cell leukemia

Case No.	1	2	3	4	5	6
Gender	F	M	M	M	M	M
Age (years)	37	47	50	46	37	50
Fever	+	+	+	+	+	-
Lymphadenopathy	+	+	-	+	+	-
Splenomegaly	+	+	+	+	+	+
Hepatomegaly	-	+	-	+	-	+
WBC (×109/L)	4.5	0.7	1.2	6.4	19.2	1.3
Hemoglobin	109	99	101	139	123	109
PLT (×109/L)	37	17	22	46	189	46
LDH index	5.93	1.25	2.62	5.27	1.41	0.11
EBV	-	+	+	-	+	NA
Hemophagocytic syndrome	-	+	+	+	+	-

Note: NA, not available.