Table 2 Clinical characteristics according to CD30-positive versus CD30-negative expression at diagnosis

No. of patients

30

66

Age at diagnosis (years)

1.000

  ≤60

26

57

  >60

4

9

Gender

0.668

  Male

20

41

  Female

10

25

ECOG PS

0.428

  0, 1

29

59

  ≥2

1

7

Subtypes

0.434

  UNKTL

18

45

  EUNKTL

12

21

B-symptoms

20

28

0.028

Mass (diameter) ≥5 cm

9

27

0.306

Local tumor invasion

21

40

0.375

Extranodal sites ≥2

20

37

0.327

Regional lymphadenopathy

17

34

0.639

Elevated serum LDH

18

23

0.021

Stage

0.684

  I, II

23

48

  III, IV

7

18

IPI score

0.339

  0, 1

16

42

  ≥2

14

24

KPI score

0.057

  0, 1

11

38

  ≥2

19

28

Treatment

0.627

  Chemotherapy

12

23

  Chemotherapy + radiotherapy

18

43