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Table 1 Baseline characteristics of patients

From: Exploring the relationships between hormone receptor, HER2 status, and bone involvement in the first distant metastases of in Chinese breast cancer patients who lacked HER2 targeted therapy

Variable

All

(n, %)

Bone involvement at DM

(n, %)

Pa

No

Yes

Patients

418(100.0)

185( 45.7)

233( 55.7)

 

BC diagnosis age (years) mean ± std

47.9 ± 10.0

48.6 ± 10.4

47.3 ± 9.6

0.181

 < 40

88( 21.1)

35( 18.9)

53( 22.7)

0.536

 < 50

144( 34.4)

61( 33.0)

83( 35.6)

 

 < 60

135( 32.3)

63( 34.1)

72( 30.9)

 

 ≥ 60

51( 12.2)

26( 14.1)

25( 10.7)

 

BC diagnosis year b

 1997 ~ 2010

169( 40.4)

74( 40.0)

95( 40.8)

0.873

 2011 ~ 2016

249( 59.6)

111( 60.0)

138( 59.2)

 

Tumor laterality

 left

223( 53.3)

98( 53.0)

125( 53.6)

0.891

 right

195( 46.7)

87( 47.0)

108( 46.4)

 

Tumor quadrant

 internal

94( 22.5)

37( 20.0)

57( 24.5)

0.278

 external

324( 77.5)

148( 80.0)

176( 75.5)

 

T stage

 T1

97( 23.2)

42( 22.7)

55( 23.6)

0.374

 T2

220( 52.6)

102( 55.1)

118( 50.6)

 

 T3-4

76( 18.2)

34( 18.4)

42( 18.0)

 

 unknown

25( 6.0)

7( 3.8)

18( 7.7)

 

N stage

 N0

138( 33.0)

57( 30.8)

81( 34.8)

0.233

 N1-3

268( 64.1)

125( 67.6)

143( 61.4)

 

 unknown

12( 2.9)

3( 1.6)

9( 3.9)

 

Tumor pathology

 IDC

345( 82.5)

151( 81.6)

194( 83.3)

0.661

 other

73( 17.5)

34( 18.4)

39( 16.7)

 

Tumor grade

 I-II

267( 63.9)

118( 63.8)

149( 63.9)

0.716

 III

89( 21.3)

37( 20.0)

52( 22.3)

 

 unknown

62( 14.8)

30( 16.2)

32( 13.7)

 

LVI

 positive

94( 22.5)

42( 22.7)

52( 22.3)

0.992

 negative

105( 25.1)

46( 24.9)

59( 25.3)

 

 unknown

219( 52.4)

97( 52.4)

122(52.4)

 

HR

 positive

296( 70.8)

116( 62.7)

180( 77.3)

0.001

 negative

117( 28.0)

68( 36.8)

49( 21.0)

 

 unknown

5( 1.2)

1( 0.5)

4( 1.7)

 

HER2

 positive

149( 35.6)

70( 37.8)

79( 33.9)

0.220

 negative

219( 52.4)

90( 48.6)

129( 55.4)

 

 undetermined

35( 8.4)

20( 10.8)

15( 6.4)

 

 missing

15( 3.6)

5( 2.7)

10( 4.3)

 

Chemotherapy

 yes

400( 95.7)

176( 95.1)

224( 96.1)

0.616

 no

18( 4.3)

9( 4.9)

9( 3.9)

 

RT

 no

231( 55.3)

105( 56.8)

126( 54.1)

0.584

 yes

187( 44.7)

80( 43.2)

107( 45.9)

 

HR and ET compliance status

 HR-positive and full one

163( 39.0)

63( 34.1)

100( 42.9)

0.004

 HR-positive and no/partial one

133( 31.8)

53( 28.6)

80( 34.3)

 

 HR-negative

117( 28.0)

68( 36.8)

49( 21.0)

 

 undetermined

5( 1.2)

4( 1.7)

1( 0.5)

 

DFS in month

 < 12

69( 16.5)

35( 18.9)

34( 14.6)

0.403

 < 24

115( 27.5)

50( 27.0)

65( 27.9)

 

 < 36

83( 19.9)

39( 21.1)

44( 18.9)

 

 < 48

59( 14.1)

20( 10.8)

39( 16.7)

 

 ≥ 48

92( 22.0)

41( 22.2)

51( 21.9)

 
  1. BC Breast cancer, DM Distant metastasis, std standard deviation, IDC Invasive ductal carcinoma, LVI Lymphovascular invasion, HR Hormone receptor, HER2 Human epidermal growth factor receptor 2, RT Radiotherapy, ET Endocrine therapy, DFS Disease-free survival
  2. aP value from ANOVA or Chi-square test on patients without the ‘unknown’ or ‘undetermined’ value
  3. b FISH test was mandatory for HER2 IHC 2 + tumor after 2010