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Table 1 Phase I design of dose escalation of induction carbon ion boost for treating GBM and AA

From: Carbon ion radiotherapy boost in the treatment of glioblastoma: a randomized phase I/III clinical trial

Remarks

Boost set

Induction carbon ion Boost

Cumulative BED* (GyE)

EQD2* (GyE)

Dose/Fx (GyE)

No. of Fx

Total dose (GyE)

Tumor

(α/β = 10)

Brain

(α/β = 3)

Tumor

(α/β = 10)

Brain

(α/β = 3)

Phase I starting dose

1

3

2

6

79.8

112.0

66.5

67.2

2

3

3

9

83.7

118.0

69.8

70.8

3

4

3

12

88.8

128.0

74.0

76.8

4

5

3

15

94.5

140.0

78.8

84.0

5

6

3

18

100.8

154.0

84.0

92.4

PRT regimen

N/A

0

0

0

72.0

100.0

60.0

60.0

  1. GBM glioblastoma, AA anaplastic astrocytoma, BED biological effective dose, EQD2 equivalent dose for a 2 GyE/fraction treatment, α/β alpha/beta ratio, Fx fraction, GyE gray-equivalents
  2. * The dose of proton radiotherapy (60 GyE in 30 fractions) is included in the calculation of cumulative BED and EQD2