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Table 1 Patient Characteristics

From: 3 fraction pencil-beam scanning proton accelerated partial breast irradiation: early provider and patient reported outcomes of a novel regimen

Variable

N = 76

Age, median (range)

67 (51–81)

Laterality

 Right

41 (54%)

 Left

35 (46%)

Histology

 Ductal

72 (96%)

 Lobular

1 (1%)

 Other

3 (3%)

Invasive

61 (80%)

DCIS

15 (20%)

Grade

 1

31 (40%)

 2

39 (51%)

 3

6 (8%)

Tumor size

  ≤ 1 cm

25 (33%)

  > 1–2 cm

47 (62%)

  > 2–2.5 cm

4 (5%)

ER status

 Positive

74 (97%)

 Negative

2 (3%)

Her-2 Positive

2 (3%)

Adjuvant Endocrine therapy

51 (67%)

Adjuvant Chemotherapy

1 (1%)