Table 5 Univariate analysis: Impact on survival after re-RT

Sex

 Male

15

12.9

0.86

31.4

0.12

 Female

6

12.4

43.0

Age, years

  ≥ 75

9

13.9

0.96

37.3

0.97

  < 75

12

10.9

31.4

Interval between end of initial RT and recurrence, months

  ≥ 24

11

13.8

0.66

31.4

0.48

  < 24

10

10.9

31.0

Interval between initial RT and re-RT, months

  ≥ 24

11

13.8

0.66

31.4

0.48

  < 24

10

10.9

31.0

Re-RT dose, Gy₁₀

  ≥ 60

16

18.2

0.04

37.4

0.41

  < 60

5

6.8

22.1

PTV size, cc

  > 75

8

12.9

0.78

16.9

0.03

  ≤ 75

13

13.8

43.5

Pathology

 NSCLC

14

13.9

0.88

31.4

0.56

 SCLC

7

10.9

37.5

Location

 Proximal

15

2.8

0.62

22.1

0.99

 Peripheral

6

18.2

37.4

Further chemotherapy after re-RT

 Yes

5

37.4

0.57

 No

9

31.4