Table 2.

Clinical features of breast cancers and treatments received for the first breast cancer

First breast cancerSecond breast cancer
Year of diagnosis (SD)1989.9 (6.7)1995.0 (5.8)
Age of diagnosis (SD)39.9 (8.8)45.0 (9.8)
Grade # (%)
    118 (8.6)23 (10.7)
    248 (23.1)60 (27.9)
    3142 (68.3)132 (61.4)
    Unknown7871
ER status (%)
    Negative163 (66.3)141 (64.7)
    Positive83 (33.7)77 (35.3)
    Unknown4068
Histology (%)
    Ductal223 (83.2)221 (87.7)
    Medullary28 (10.4)15 (5.9)
    Lobular8 (3.0)7 (2.8)
    Other9 (3.4)9 (3.6)
    Unknown1834