Efficacy of adjuvant chemotherapy according to hormone receptor status in young patients with breast cancer: a pooled analysis

Table 1 Characteristics of 480 breast cancer patients 40 years old or younger

Characteristic		Number of patients (percentage) Total = 480
Clinical tumor size	T1	185 (39)
	T2/3	293 (61)
	Missing data	2 (0)
Histological tumor size	T1	292 (61)
	T2/3	151 (31)
	Missing data	37 (8)
Histological nodal status	Negative	288 (60)
	Positive	188 (39)
	Missing data	4 (1)
Surgery	Breast-conserving surgery	393 (82)
	Mastectomy	86 (18)
	Missing data	1 (0)
Adjuvant chemotherapy	No	279 (58)
	Yes	200 (42)
	Missing data	1 (0)
Tamoxifen^a	No	273 (57)
	Yes	9 (2)^b
	Missing data	198 (41)
Histological grade	I	70 (15)
	II	145 (30)
	III	255 (53)
	Missing data	10 (2)
Estrogen receptor	Positive	288 (60)
	Negative	180 (38)
	Missing data	12 (3)
Progesterone receptor	Positive	223 (46)
	Negative	241 (50)
	Missing data	16 (3)

^aDuring the period of time in which these trials were conducted, tamoxifen was not routinely given to premenopausal patients with estrogen receptor (ER)-positive tumors. ^bAll patients who received tamoxifen had ER-positive tumors. T, tumor size.

ISSN: 1465-542X