Adjuvant chemotherapy and survival in males aged 70 years or older with breast cancer: a population-based retrospective study

Table 1 Baseline characteristics of patients with chemotherapy and no-chemotherapy

Characteristics		No-Chemotherapy (n = 1652)		Chemotherapy (n = 248)		Total (n = 1900)		P ^c
Characteristics		No	%	No	%	No	%	P ^c
Median follow-up (months) (Interquartile Range)		186 (164–208)		102 (81–123)		174 (153–195)
Race	White	1436	86.9	206	83.1	1642	86.4	0.196
	Black	143	8.7	30	12.1	173	9.1
	Other ^a	73	4.4	12	4.8	85	4.5
Marital status	Married	1113	67.4	183	73.8	1296	68.2	0.127
	Not married ^b	469	28.4	56	22.6	525	27.6
	Missing	70	4.2	9	3.6	79	4.2
Laterality	Left	836	50.6	133	53.6	969	51.0	0.374
Laterality	Right	816	49.4	115	46.4	931	49.0
Histology	Ductal	1275	77.2	207	83.5	1482	78.0	0.026
Histology	Other ^d	377	22.8	41	16.5	418	22.0
Grade	Well	181	11.0	7	2.8	188	9.9	< 0.001
	Moderately	649	39.3	103	41.5	752	39.6
	Poorly/undifferentiated	424	25.7	100	40.3	524	27.6
	Missing	398	24.1	38	15.3	436	22.9
Stage	I	533	32.3	28	11.3	561	29.5	< 0.001
	II	566	34.3	107	43.1	673	35.4
	III	192	11.6	91	36.7	283	14.9
	Missing	361	21.9	22	8.9	383	20.2
Tumor size	T1	689	41.7	74	29.8	763	40.2	< 0.001
	T2	477	28.9	117	47.2	594	31.3
	T3/4	120	7.3	32	12.9	152	8.0
	Missing	366	22.2	25	10.1	391	20.6
Nodal status	N0	893	54.1	68	27.4	961	50.6	< 0.001
	N1	274	16.6	82	33.1	356	18.7
	N2/3	115	7.0	73	29.4	188	9.9
	Missing	370	22.4	25	10.1	395	20.8
Estrogen Receptor	Positive	1047	63.4	197	79.4	1244	65.5	< 0.001
	Negative	31	1.9	7	2.8	38	2.0
	Missing	574	34.7	44	17.7	618	32.5
Progesterone Receptor	Positive	964	58.4	175	70.6	1139	59.9	< 0.001
	Negative	100	6.1	25	10.1	125	6.6
	Missing	588	35.6	48	19.4	636	33.5
Surgery approach	Breast Conserving Surgery	119	7.2	6	2.4	125	6.6	< 0.001
	Mastectomy	791	47.9	180	72.6	971	51.1
	Missing	742	44.9	62	25.0	804	42.3
Radiation status	No	1374	83.2	150	60.5	1524	80.2	< 0.001
Radiation status	Yes	278	16.8	98	39.5	376	19.8

Note:
^a Other includes American Indian/Alaskan native and Asian/Pacific Islander and Unknown
^b Not married includes divorced, separated, single (never married), unmarried or domestic partner, and widowed
^c The P value of the Chi-square test was calculated between the chemotherapy and without chemotherapy groups, and bold type indicates significance
^d Other represents all pathological types other than invasive ductal breast cancer, including invasive lobular carcinoma, medullary carcinoma, mucinous carcinoma, intraductal papilloma, papillary carcinoma, tubular carcinoma, and so on

ISSN: 1471-2318