Research on Effectiveness of Prior Cancer on Survival Outcomes for Patients with Nonmetastatic Triple-Negative Breast Cancer: A Competing Risk Analysis and Propensity Score Matching Analysis of the SEER Database
Table 1
Baseline characteristics of patients diagnosed with TNBC before and after propensity score matching.
Characteristics
Before PSM
After PSM
No prior cancer
Prior cancer
value
No prior cancer
Prior cancer
value
Total
n = 24219 (%)
n = 5375 (%)
n = 5375 (%)
n = 5375 (%)
Age
<0.001
0.985
20–39
2265 (9.4)
174 (3.2)
161 (3.0)
174 (3.2)
40–49
4822 (19.9)
582 (10.8)
592 (11.0)
582 (10.8)
50–59
6456 (26.7)
1220 (22.7)
1210 (22.5)
1220 (22.7)
60–69
5791 (23.9)
1541 (28.7)
1551 (28.9)
1541 (28.7)
70–79
3225 (13.3)
1185 (22.0)
1186 (22.1)
1185 (22.0)
80+
1660 (6.9)
673 (12.5)
675 (12.6)
673 (12.5)
Race
<0.001
0.923
Black
4877 (20.1)
990 (18.4)
982 (18.3)
990 (18.4)
White
1920 (7.9)
340 (6.3)
332 (6.2)
340 (6.3)
Other
17422 (71.9)
4045 (75.3)
4061 (75.6)
4045 (75.3)
Marital
<0.001
0.629
Married
13987 (57.8)
2850 (53.0)
2824 (52.5)
2850 (53.0)
Single
10232 (42.2)
2525 (47.0)
2551 (47.5)
2525 (47.0)
Laterality
0.436
0.44
Left
12440 (51.4)
2793 (52.0)
2752 (51.2)
2793 (52.0)
Right
11779 (48.6)
2582 (48.0)
2623 (48.8)
2582 (48.0)
Grade
<0.001
0.247
I
422 (1.7)
162 (3.0)
129 (2.4)
162 (3.0)
II
3994 (16.5)
1164 (21.7)
1157 (21.5)
1164 (21.7)
III
19638 (81.1)
4016 (74.7)
4059 (75.5)
4016 (74.7)
IV
165 (0.7)
33 (0.6)
30 (0.6)
33 (0.6)
T status
<0.001
0.706
T1
10852 (44.8)
3133 (58.3)
3128 (58.2)
3133 (58.3)
T2
10418 (43.0)
1800 (33.5)
1835 (34.1)
1800 (33.5)
T3
1947 (8.0)
272 (5.1)
254 (4.7)
272 (5.1)
T4
1002 (4.1)
170 (3.2)
158 (2.9)
170 (3.2)
N status
<0.001
0.441
N0
16141 (66.6)
4100 (76.3)
4109 (76.4)
4100 (76.3)
N1
5572 (23.0)
863 (16.1)
891 (16.6)
863 (16.1)
N2
1460 (6.0)
227 (4.2)
216 (4.0)
227 (4.2)
N3
1046 (4.3)
185 (3.4)
159 (3.0)
185 (3.4)
Surgery
<0.001
0.904
BCS
12735 (52.6)
1981 (36.9)
1974 (36.7)
1981 (36.9)
Mastectomy
11484 (47.4)
3394 (63.1)
3401 (63.3)
3394 (63.1)
Radiotherapy
<0.001
0.526
No
11353 (46.9)
3605 (67.1)
3573 (66.5)
3605 (67.1)
Yes
12866 (53.1)
1770 (32.9)
1802 (33.5)
1770 (32.9)
Chemotherapy
<0.001
0.797
No
5615 (23.2)
2120 (39.4)
2106 (39.2)
2120 (39.4)
Yes
18604 (76.8)
3255 (60.6)
3269 (60.8)
3255 (60.6)
Note. TNBC: triple-negative breast cancer with prior cancer; BCS: breast-conserving therapy. value <0.05 was considered statistically significant.
