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 2
Baseline characteristics of patients diagnosed with P-TNBC before and after propensity score matching.
Characteristics
Before PSM
After PSM
One prior cancer
Two or more prior cancers
value
One prior cancer
Two or more prior cancers
value
Total
n = 4584 (85.3%)
n = 791 (14.7%)
n = 791 (50%)
n = 791 (50%)
Age
20–39
164 (3.6)
10 (1.3)
<0.001
9 (1.1)
10 (1.3)
0.949
40–49
533 (11.6)
49 (6.2)
56 (7.1)
49 (6.2)
50–59
1055 (23.0)
165 (20.9)
171 (21.6)
165 (20.9)
60–69
1327 (28.9)
214 (27.1)
215 (27.2)
214 (27.1)
70–79
957 (20.9)
228 (28.8)
213 (26.9)
228 (28.8)
80+
548 (12.0)
125 (15.8)
127 (16.1)
125 (15.8)
Race
Black
857 (18.7)
133 (16.8)
0.001
125 (15.8)
133 (16.8)
0.647
White
312 (6.8)
28 (3.5)
23 (2.9)
28 (3.5)
Other`
3415 (74.5)
630 (79.6)
643 (81.3)
630 (79.6)
Marital
Married
2447 (53.4)
403 (50.9)
0.22
394 (49.8)
403 (50.9)
0.687
Single
2137 (46.6)
388 (49.1)
397 (50.2)
388 (49.1)
Laterality
Left
2403 (52.4)
390 (49.3)
0.114
393 (49.7)
390 (49.3)
0.92
Right
2181 (47.6)
401 (50.7)
398 (50.3)
401 (50.7)
Grade
I
140 (3.1)
22 (2.8)
0.805
16 (2.0)
22 (2.8)
0.808
II
985 (21.5)
179 (22.6)
180 (22.8)
179 (22.6)
III
3432 (74.9)
584 (73.8)
589 (74.5)
584 (73.8)
IV
27 (0.6)
6 (0.8)
6 (0.8)
6 (0.8)
T status
T1
2643 (57.7)
490 (61.9)
0.135
516 (65.2)
490 (61.9)
0.162
T2
1556 (33.9)
244 (30.8)
238 (30.1)
244 (30.8)
T3
239 (5.2)
33 (4.2)
20 (2.5)
33 (4.2)
T4
146 (3.2)
24 (3.0)
17 (2.1)
24 (3.0)
N status
N0
3435 (74.9)
665 (84.1)
<0.001
676 (85.5)
665 (84.1)
0.452
N1
781 (17.0)
82 (10.4)
83 (10.5)
82 (10.4)
N2
205 (4.5)
22 (2.8)
19 (2.4)
22 (2.8)
N3
163 (3.6)
22 (2.8)
13 (1.6)
22 (2.8)
Surgery
BCS
1734 (37.8)
247 (31.2)
<0.001
255 (32.2)
247 (31.2)
0.705
Mastectomy
2850 (62.2)
544 (68.8)
536 (67.8)
544 (68.8)
Radiotherapy
No
3016 (65.8)
589 (74.5)
<0.001
597 (75.5)
589 (74.5)
0.685
Yes
1568 (34.2)
202 (25.5)
194 (24.5)
202 (25.5)
Chemotherapy
No
1719 (37.5)
401 (50.7)
<0.001
393 (49.7)
401 (50.7)
0.725
Yes
2865 (62.5)
390 (49.3)
398 (50.3)
390 (49.3)
Note. P-TNBC: triple-negative breast cancer with prior cancer; BCS: breast-conserving therapy; PSM: propensity score matching.
