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Table 6 Late rectal and urinary toxicity of prospective hypofractionation studies using ≥ 3 Gy per fraction

From: Toxicity report of once weekly radiation therapy for low-risk prostate adenocarcinoma: preliminary results of a phase I/II trial

Author

Fractionation

Schedule

Fraction Size (Gy)

EQD2 if α/β 1.5

EQD2

if α/β 3

Grade ≥ 2 rectal toxicity

Grade ≥ 2 urinary toxicity

Present study

45 Gy/9

5

83.6

72.0

8%/19%§

11%/24%§

Martin et al (13)

60 Gy/20

3

77.1

72.0

6% (5 years)

10%

Rene et al (24)

66 Gy/22

3

84.9

79.2

25%*

32%*

Arcangeli et al (14)

62 Gy/20

3.1

81.5

75.6

17% (3 years)

14%

Coote et al (18)

57-60 Gy/19-20

3

73.3-77.1

68.4-72.0

9.5% (2 years)

8%

Madsen et al (20)

33.5 Gy/5

6.7

78.5

65.0

7.5%

20%

King et al (11)

36.25 Gy/5

7.25

90.6

74.3

15%

29%

  1. EQD2 if α/β 1.5 = biologically effective dose in 2 Gy fractions assuming α/β ratio of 1.5
  2. EQD2 if α/β 3 = biologically effective dose in 2 Gy fractions assuming α/β ratio of 3
  3. §Crude rate at 31 months/Cumulative three-year rate
  4. *Worse crude rate at anytime during follow-up