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Table 4 Univariate analysis for risk factors of ≥grade 1 late morbidities in rectum

From: Dose constraints in the rectum and bladder following carbon-ion radiotherapy for uterus carcinoma: a retrospective pooled analysis

 

24 fractions, n = 41

20 fractions, n = 91

Factors

Subgroup

Number of patients

p value

Subgroup

Number of patients

p value

V10

≥37.1 cm3

21

0.755

≥30.0 cm3

46

0.057

< 37.1 cm3

20

< 30.0 cm3

45

V20

≥36.9 cm3

21

0.960

≥26.2 cm3

44

0.185

< 36.9 cm3

20

< 26.2 cm3

47

V30

≥25.5 cm3

21

0.615

≥18.3 cm3

46

0.921

< 25.5 cm3

20

< 18.3 cm3

45

V40

≥16.9 cm3

21

0.668

≥11.2 cm3

45

0.354

< 16.9 cm3

20

< 11.2 cm3

46

V50

≥8.4 cm3

21

0.437

≥5.4 cm3

45

0.050

< 8.4 cm3

20

< 5.4 cm3

46

V60

≥3.0 cm3

15

0.337

≥0.5 cm3

43

0.038

< 3.0 cm3

15

< 0.5 cm3

48

D5cc

≥55.1 Gy (RBE)

21

0.429

≥50.6 Gy (RBE)

46

0.052

< 55.1 Gy (RBE)

20

< 50.6 Gy (RBE)

45

D2cc

≥59.6 Gy (RBE)

21

0.254

≥56.1 Gy (RBE)

46

0.027

< 59.6 Gy (RBE)

20

< 56.1 Gy (RBE)

45

Dmax

≥68.0 Gy (RBE)

21

0.086

≥67.0 Gy (RBE)

46

0.517

< 68.0 Gy (RBE)

20

< 67.0 Gy (RBE)

45

Diabetes

Yes

2

0.823

Yes

7

0.353

No

39

No

84

Anticoagulants

Yes

1

0.196

Yes

10

0.458

No

40

No

81

Age

≥56 years

21

0.727

≥60 years

47

0.464

< 56 years

20

< 60 years

44