Table 3.

Time-stratified hazard ratios, breast cancer–specific mortality adjusted for race, age at diagnosis, and date of diagnosis

Breast cancer–specific, time-stratified HR (95% CI)
Years 0–5Years > 5
Race
 White1.001.00
 African American1.6 (1.2–2.3)1.9 (1.2–3.0)
Menopause
 Premenopausal1.00
 Postmenopausal0.8 (0.6–1.1)a
Subtypes
 Luminal A1.001.00
 Luminal B1.3 (0.7–2.5)1.5 (0.8–2.8)
 Basal2.7 (1.8–4.0)0.6 (0.3–1.3)
 HER2+/ER2.9 (1.7–5.0)1.6 (0.8–3.5)
 Unclassified1.9 (1.2–3.2)0.8 (0.3–1.8)
Combined subtypes
 Luminal A and B1.001.00
 Basal2.5 (1.7–3.7)0.6 (0.3–1.1)
 HER2+/ER2.8 (1.6–4.6)1.5 (0.7–3.2)
ER status
 ER+1.001.00
 ER2.5 (1.8–3.5)0.7 (0.4–1.1)
PR status
 PR+1.001.00
 PR2.2 (1.6–3.1)1.0 (0.6–1.6)
HER2 status
 HER21.00
 HER2+1.4 (1.0–1.8)a
  • aSingle estimate given because proportional hazards assumption was not violated.