Table 1.

Characteristics of patients with adequate DNA samples in treated and untreated groups in SWOG 8897

Characteristics% treated group (n = 458)% untreated group (n = 874)
Age
 <40158
 40–493731
 50–592325
 60–691924
 ≥70612
 Median (range), y49 (27–85)54 (24–89)
Race
 Non-Hispanic white9094
 Other106
Menopausal status
 Premenopausal5138
 Postmenopausal4962
Postmenopausal estrogen
 Yes1418
 No8682
Primary treatment
 BCS, delayed RT1823
 BCS, RT prior to registration1212
 Mastectomy7064
Tumor size, cm
 ≤1050
 1.1–1.910050
Neutropenia
 ≤233
 322
 445
Leucopenia
 ≤238
 348
 414
Thrombocytopenia
 ≤298
 31
 41
Grade 4 hematologic toxicity count
 053
 135
 212
No. of events (recurrence or death)129257

Abbreviations: BCS, breast-conserving surgery; RT, radiation therapy.