Table 1 Descriptive statistics for the measures of estrogen receptor expression by follow-up outcome

Overall

n = 1,204

n = 272

n = 63

n = 869

ER-positive^a (%)

58.0

42.5^b

67.0^b

61.8^b

Among women with ER-positive^a tumor

  % of tumor cell nuclei positively stained for ER

64.7 (25.5)

62.2 (27.0)

65.6 (24.5)

65.1 (25.2)

0.53

  ER H-score^c

100.8 (53.0)

93.0 (52.9)

104.5 (54.6)

102.2 (52.9)

0.22

  ER/PR/HER2 score^d

–64.8 (40.6)

–49.9 (43.5)

–65.7 (34.7)

–67.9 (39.8)

<0.0001

White women

n = 681

n = 131

n = 24

n = 526

ER-positive^a (%)

62.5^b

47.2^b

78.6^b

65.8^b

Among women with ER-positive^a tumor

  % of tumor cell nuclei positively stained for ER

64.6 (25.9)

58.0 (27.4)

74.4 (18.1)

65.2 (25.7)

0.03

  ER H-score^c

100.7 (53.2)

82.3 (48.8)

122.1 (44.9)

102.8 (53.7)

0.004

  ER/PR/HER2 score^d

–67.6 (39.7)

–46.1 (44.7)

–78.8 (26.3)

–70.8 (38.2)

<0.0001

Black women

n = 523

n = 141

n = 39

n = 343

ER-positive^a (%)

51.3^b

38.0^b

60.0^b

55.8^b

Among women with ER-positive^a tumor

  % of tumor cell nuclei positively stained for ER

64.8 (24.9)

67.2 (25.9)

58.3 (26.9)

65.0 (24.3)

0.35

  ER H-score^c

100.9 (52.8)

105.5 (55.2)

90.0 (58.4)

101.0 (51.5)

0.50

  ER/PR/HER2 score^d

–60.3 (41.8)

–54.3 (42.1)

–54.8 (37.4)

–62.7 (42.1)

0.35