Table A1.

Patient Demographic and Clinical Characteristics

Characteristic	TamRT Arm		Tam Arm		Total
	No.	%	No.	%	No.	%
Treated patients	317	100	319	100	636	100
Stratification
ER status
Positive	313	99	313	98	626	98
Negative	4	1	6	2	10	2
Tumor size, cm
≤ 2	310	98	313	98	623	98
> 2	7	2	6	2	13	2
Age at enrollment, years
< 75	141	44	147	46	288	45
≥ 75	176	56	172	54	348	55
Demographics
Race
White	287	91	287	90	574	90
Hispanic	5	2	8	3	13	2
Black	23	7	22	7	45	7
Asian	0	0	2	1	2	< 1
Other	1	< 1	0	0	1	< 1
Unknown	1	< 1	0	0	1	< 1
Diagnostic axillary involvement
Underwent axillary dissection	122	38	119	37	241	38

Abbreviation: ER, estrogen receptor; Tam, tamoxifen alone; TamRT, tamoxifen plus radiation therapy.