Table 1 Characteristics of the non-oligometastatic patient cohort before and after PSM

Total

93

90

59

59

Gender

 Male

66

59

0.431

47

38

0.065

 Female

27

31

12

21

Age (years)

 <60 years

52

48

0.726

31

27

0.461

 ≥60 years

41

42

28

32

KPS Score

 ≤80

58

52

32

32

 >80

35

38

0.526

27

27

1.000

Pathological type

 Squamous carcinoma

35

24

0.048

24

20

0.651

 adenocarcinoma

47

61

30

35

 Other

11

5

5

4

T status

 T_1-2

33

36

0.529

19

22

0.562

 T_3-4

60

54

40

37

N status

 N_0-1

11

14

0.463

5

12

0.066

 N_2-3

82

76

54

47

Response to chemotherapy

 Yes

64

68

43

43

1.000

 No

29

22

0.309

16

16

No. of chemotherapy cycles

 <4

63

32

<0.001

30

30

1.000

 ≥4

30

58

29

29

GTV volume (cm³)

 <146

44

40

0.697

23

23

1.000

 ≥146

49

50

36

36

Metastasis status

 Single organ

37

41

0.430

23

27

0.456

 2 to 3 organs

56

49

36

32