Table 2.

Adjusteda logistic regression model of factors associated with having secondary breast cancer compared with primary breast cancer.

CharacteristicsORs (95% CI)
Race/ethnicity
 Non-Hispanic WhiteReference
 Non-Hispanic Black1.35 (1.11–1.66)
 Hispanic1.05 (0.91–1.21)
 Asian/Pacific Islander0.76 (0.63–0.92)
Age (years)
 12–24Reference
 25–290.62 (0.23–1.67)
 30–340.79 (0.32–1.98)
 35–391.23 (0.50–3.01)
 40–440.96 (0.39–2.34)
 45–500.42 (0.17–1.04)
Year of diagnosis
 1988–1994Reference
 1995–20013.47 (2.60–4.62)
 2002–20085.34 (4.02–7.09)
 2009–20146.56 (4.91–8.75)
Tumor grade
 Grade IReference
 Grade II1.29 (1.03–1.60)
 Grade III1.76 (1.41–2.21)
 Undifferentiated1.82 (1.22–2.73)
Histology
 DuctalReference
 Lobular1.16 (0.97–1.40)
Tumor size
 T1a: ≤0.5 cmReference
 T1b: >0.5–1 cm0.97 (0.76–1.24)
 T1c: >1–2 cm0.61 (0.49–0.76)
 T2: >2–5 cm0.43 (0.34–0.55)
 T3: >5.00 cm0.38 (0.28–0.52)
 Diffuse0.58 (0.34–0.99)
Regional lymph node involvement
 Positive0.58 (0.51–0.67)
 NegativeReference
ER and PR status
 PositiveReference
 Negative1.76 (1.52–2.03)
  • Note: The estimates of ORs for unknown groups are not present.

  • aModels adjusted for all variables in the table.