Table 1 Patients' characteristics

Age at salvage RT (years)

67 (49-81)

Pathologic tumor stage

T1

2

T2

41

T3

57

T4

1

Unknown

2

Surgical margin

Positive

48

Negative

51

Unknown

3

Gleason score

≤ 6

31

7

35

8 ≥

31

Unknown

5

Preoperative PSA (ng/ml)

8.8 (1.6-120)

< 10

58

≥ 10

44

Pre-RT PSA (ng/ml)

0.240 (0.011-0.994)

< 0.25

52

≥ 0.25

50

PSA doubling time (months)

6.83 (0.58-41.9)

< 7

43

≥ 7

43

Not available

16

RT dose (Gy) (BED, α/β = 1.5)

64 (149.3) (60-72 [129.6-163.3])

60 at 2 daily (140.0)

18

62 at 2 daily (144.7)

1

64 at 2 daily (149.3)

67

64.8 at 1.8 daily (142.6)

12

70 at 2 daily (163.3)

3

72 at 1.2 per fraction twice daily (HF) (129.6)

1

Time from RP to RT (months)

21 (5-99)

< 24

56

≥ 24

46

Hormone therapy

Done

29

Not done

73