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Table 1 Demographic and tumor characteristics among all patients 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 P*
Characteristics No % No %
Patients 5352 68.3 2480 31.7  
Age of diagnosis, years
Mean (SD) 64.4 (12.5)   72.8 (13.3)    < 0.001
Median (IQR) 66.0 (56.0–74.0)   76.0 (65.0–83.0)    < 0.001
 < 50 749 14.1 194 7.8  < 0.001
50–59 1008 18.8 232 9.4
60–69 1495 27.9 386 15.6
 ≥ 70 2100 39.2 1668 67.2
Era of diagnosis
1998–2004 2027 37.9 845 34.1 0.002
2005–2009 1515 28.3 772 31.1
2010–2015 1810 33.8 863 34.8
Race
White 4292 80.2 2079 83.8  < .001
Black 453 8.5 225 9.1
Othera 607 11.3 176 7.1
Marital status
Married 2892 54.0 984 39.7  < 0.001
Non-marriedb 680 12.7 258 10.4
DSWc 1680 30 1106 44.6
Unknown 172 3.2 132 5.3
Laterality
Left 2782 52.0 1317 53.1 0.354
Right 2570 48.0 1163 46.9
Tumor size (T stage), cm
Mean (SD) 1.4 (0.7)   1.4 (0.7)   0.092
Median (IQR) 1.3 (0.9–1.8)   1.3 (0.9–1.8)   0.139
 ≤ 1.0 (T1) 2034 38.0 909 36.7 0.488
1.1–2.0 (T1) 2456 45.9 1170 47.2
2.1–3.0 (T2) 862 16.1 401 16.1
Tumor grade
I 2977 55.6 1366 55.1 0.002
II 1478 27.6 627 25.3
III 135 2.5 52 2.1
IV 8 0.2 4 0.2
unknown 754 14.1 431 17.4
ER status
Positive 5002 93.5 2176 87.7  < 0.001
Negative 88 1.6 30 1.2
Unknown 262 4.9 274 11.0
PR status
Positive 4503 84.1 1953 78.8  < 0.001
Negative 510 9.5 206 8.3
Unknown 339 6.4 321 12.9
Chemotherapy
No/Unknown 4854 90.7 2371 95.6  < 0.001
Yes 498 9.3 109 4.4
  1. RT radiotherapy, SD standard deviation, IQR interquartile range; DSW, divorced, separated and widowed
  2. *Categoric variables were analyzed by the Pearson x2 test, and continuous variables (age, tumor size) were analyzed by the t tests or Mann–Whitney tests
  3. aIncluding Asian or Pacific Islander, American Indian, Alaska Native and unknown race
  4. bIncluding unmarried or domestic partner, single (never married)
  5. cIncluding divorced, separated and widowed