Table 1.

Age-adjusted OR of ER-negative tumor development by statin use before diagnosis of breast cancer

Statin useBreast cancersER/PR-negative tumors (%)OR (95% CI) of ER/PR-negative tumorP*
Never1,754323 (18)1.0 (reference)
<1 y8417 (20)1.25 (0.72-2.17)0.42
≥1 y30334 (11)0.63 (0.43-0.92)0.02
  • * P values for test against “Never.”