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Table 2 Demographic and tumor characteristics among propensity-matched population with pure mucinous breast cancer

From: Effect of postoperative radiotherapy in women with localized pure mucinous breast cancer after lumpectomy: a population-based study

  RT Non-RT Standardized difference
Characteristics No % No %
Patients 2149 50.0 2149 50.0  
Age of diagnosis, years
Mean (SD) 70 (11.9)   71 (12.9)   0.081
 < 50 163 7.6 194 9.0 0.050
50–59 233 10.8 232 10.8 0.000
60–69 463 21.5 380 17.7 0.096
 ≥ 70 1290 60.0 1343 62.5 0.051
Era of diagnosis
1998–2004 792 36.9 731 34.0 0.061
2005–2009 585 27.2 673 31.3 0.090
2010–2015 772 35.9 745 35.3 0.011
Race
White 1769 82.3 1782 82.9 0.015
Black 186 8.7 202 9.4 0.026
Other 194 9.0 165 7.7 0.047
Marital status
Married 932 43.3 956 44.5 0.022
Non-married 215 10.0 227 10.6 0.020
DSW 902 42.0 880 40.9 0.022
Unknown 100 4.7 86 4.0 0.033
Laterality
Left 1124 52.3 1139 53.0 0.014
Right 1025 47.7 1010 47.0 0.014
Tumor size (T stage), cm
Mean (SD) 1.4 (0.7)   1.4 (0.7)   0.000
 ≤ 1.0 (T1) 817 38.0 822 38.3 0.006
1.1–2.0 (T1) 985 45.8 1009 47.0 0.024
2.1–3.0 (T2) 347 16.1 318 14.8 0.036
Tumor grade
I 1164 54.2 1212 56.4 0.044
II 566 26.3 558 26.0 0.007
III 45 2.1 46 2.1 0.000
IV 4 0.2 4 0.2 0.000
unknown 370 17.2 329 15.3 0.052
ER status
Positive 1912 89.0 1952 90.8 0.060
Negative 34 1.6 30 1.4 0.012
Unknown 203 9.4 167 7.8 0.058
PR status
Positive 1732 80.6 1754 81.6 0.027
Negative 182 8.5 186 8.7 0.005
Unknown 235 10.9 209 9.7 0.039
Chemotherapy
No/Unknown 2019 94.0 2040 94.9 0.039
Yes 130 6.0 109 5.1 0.039
  1. RT radiotherapy, SD standard deviation, DSW divorced, separated and widowed