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Table 1 patiens characteristics

From: A retrospective study of adjuvant proton radiotherapy for breast cancer after lumpectomy: a comparison of conventional-dose and hypofractionated dose

Parameter

Total number

(50 cases)

50 Gy group

(14 cases)

40.05 Gy group

(36 cases)

(36 cases)

p-value

Age, median (range)

29–77(47)

29–65(47)

32–77(47)

0.754

Area of treatment

   

–

Breast only

34

4

30

 

Supreclavicular area

12

7

5

 

Axillary area

6

4

2

 

Internal mammary LN

5

5

0

 

Laterality

   

0.403

Left

36

11

25

 

Right

12

3

9

 

Bilateral

2

0

2

 

Histology

   

0.065

Invasive ductal carcinoma

38

13

25

 

Invasive lobular carcinoma

4

1

3

 

Mixed

4

0

4

 

Carcinoma in situ

2

0

2

 

Other

2

0

2

 

Estrogen receptor status

   

–

Positive

29

6

23

 

Negative

21

8

13

 

Progesterone receptor status

    

Positive

26

5

21

 

Negative

24

9

15

 

Her2/neu status

    

Positive

8

2

6

 

Negative

42

12

30

 

Histologic grade

   

0.065

1

7

1

6

 

2

20

5

15

 

3

21

8

13

 

Unknown

2

0

2

 

Tumor stage

   

–

T1

38

10

28

 

T2

11

3

8

 

T3

1

1

0

 

T4

0

0

0

 

Nodal stage

   

–

N0

35

6

29

 

N1

14

7

7

 

N2

1

1

0

 

N3

0

0

0

 

Pathological stage

Stage

   

0.042

I

26

5

21

 

II

22

7

15

 

III

2

2

0

 

Chemotherapy timing

   

0.119

Adjuvant

37

12

25

 

Neoadjuvant

2

1

1

 

None(endocrinotherapy)

11

1

10

 

Radiation dose

   

–

50 Gy

14

–

–

 

40.05 Gy

36

–

–

Â