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Table 1 Patients’ properties

From: High-dose carbon-ion based radiotherapy of primary and recurrent sacrococcygeal chordomas: long-term clinical results of a single particle therapy center

Characteristics

Value

%

Age (years)

 Median

61

 

 Range

34–84

 

Gender (n)

 Female

22

32.4

 Male

46

67.6

Resection status (n)

 Biopsy

28

41.2

 R2

26

38.2

 R0/1

14

20.6

Treatment (n)

 Primary

52

76.5

 Recurrent

16

23.5

Most cranial level of tumor (n)

 L4/5

7

10.3

 S1

12

17.7

 S2

23

33.8

 S3

14

20.6

 S4

5

7.4

 S5

4

5.9

 Os coccygeum

3

4.4

GTV (ml)

 Median

182

 

 Range

0–1727

 

CTV1 (ml)

 Median

263

 

 Range

0–1743

 

CTV2 (ml)

 Median

938

 

 Range

60–2577

 

PTV1 (ml)

 Median

414

 

 Range

0–2325

 

PTV2 (ml)

 Median

1109

 

 Range

84–3138

 

Radiation dose

ED2Gy

  

Carbon ion only:

(α/β = 2)

  

 60 Gy/3 Gy (RBE)

75.0 Gy

16

23.5

 63 Gy/3 Gy (RBE)

78.8 Gy

2

2.9

 66 Gy/3 Gy (RBE)

82.5 Gy

14

20.6

 64 Gy/4 Gy (RBE)

96.0 Gy

14

20.6

IMRT + carbon ion boost

 50 Gy/2 Gy + 15 Gy/3 Gy (RBE)

68.8 Gy

1

1.5

 50 Gy/2 Gy + 18 Gy/3 Gy (RBE)

74.5 Gy

1

1.5

 50 Gy/2 Gy + 24 Gy/3 Gy (RBE)

80.0 Gy

20

29.4

  1. Abbreviations: GTV Gross tumor volume, CTV1 Clinical target volume (Boost plan), CTV2 Clinical target volume (primary plan), RBE Relative biological effectiveness, IMRT Intensity-modulated radiotherapy