Table 2.

Associations of age (years) at diagnosis with palliative therapy in patients with recurrent metastatic breast cancer from a breast cancer cohort in China between 1989 and 2020

All		< 40	40–64	≥ 65	P
Regimens
	No. ( %)	No. (%)	No. ( %)	No. ( %)
Palliative chemotherapy					< 0.001
No/ unknown	746 (45.60)	148 (40.77)	533 (45.44)	65 (65.00)
Yes	890 (54.40)	215 (59.23)	640 (54.56)	35 (35.00)
Palliative radiotherapy					0.259
No/ unknown	1,437 (87.84)	311 (85.67)	1,035 (88.24)	91 (91.00)
Yes	199 (12.16)	215 (59.23)	138 (11.76)	9 (9.00)
Palliative hormonal therapy					0.013
No/ unknown	1,055 (64.49)	212 (58.40)	772 (65.81)	71 (71.00)
Yes	581 (35.51)	151 (41.60)	401 (34.19)	29 (29.00)
Palliative target therapy					0.077
No/ unknown	1,494 (91.32)	326 (89.81)	1,071 (91.30)	97 (97.00)
Yes	142 (8.68)	37 (10.19)	102 (8.70)	3 (3.00)
No. of regimens					0.003
One	577 (35.27)	122 (33.61)	418 (35.64)	37 (37.00)
Tow	375 (22.92)	102 (28.1)	261 (22.25)	12 (12.00)
Three	147 (8.99)	39 (10.74)	103 (8.78)	5 (5.00)
Four	11 (0.67)	3 (0.83)	8 (0.68)	0 (0.00)
Unknown	526 (32.15)	97 (26.72)	383 (32.65)	46 (46.00)
One regimen					0.125
Only chemotherapy	374 (64.82)	76 (62.29)	278 (66.51)	20 (54.05)
Only radiotherapy	13 (2.25)	2 (1.64)	8 (1.91)	3 (8.11)
Only hormonal therapy	183 (31.72)	41 (33.61)	128 (30.62)	14 (37.84)
Only target therapy	7 (1.21)	3 (2.46)	4 (0.96)	0 (0.00)
Two regimens					0.190
Chemo- and radiotherapy	60 (16.00)	17 (16.67)	42 (16.09)	1 (8.33)
Chemo- and hormonal	239 (63.73)	65 (63.73)	166 (63.60)	8 (66.67)
Chemo- and target	59 (15.73)	15 (14.71)	43 (16.48)	1 (8.33)
Radiotherapy and hormonal	10 (2.67)	2 (1.96)	6 (2.30)	2 (16.67)
Radiotherapy and target	0 (0.00)	0 (0.00)	0 (0.00)	0 (0.00)
Hormonal and target	7 (1.87)	3 (2.94)	4 (1.53)	0 (0.00)