Biology And Prognosis By Age Of Primary Operable Breast Cancer

Abstract #2082 Introduction Breast cancer (BC) biology and prognosis are age dependent. We studied the effect of age on BC biology, treatment and prognosis. Methods Data from 2059 consecutive patients, primary operated for invasive BC in UZ Leuven (01/01/00–01/06/05), were used. Patients with ≥ 3.5 yrs follow-up were included (n=1064) to study relapse in relation to age (logistic regression). Results Early relapse in BC is age-related, decreasing 3.2% each yr for patients 60 yrs: early relapse increases 5.5% each yr (p=0.0007, 95% CI OR: 1.021-1.082). The positive lymph node status is decreasing 3.5% each yr 60 years. For the progesterone receptor (PR), this depends quadratically on the age at diagnosis (p=0.0108, 95% CI OR=0.999-1.000), decreasing Conclusion Early relapse was higher with increasing/decreasing age, starting from age 60. This goes in parallel with the U-shape curve of lymph node involvement (Fig1). Increased relapse and lymph node positivity in elderly might partially be a reflection of the fact that BC is diagnosed in a later stage in elderly patients but might also be related to different biological behavior or to decreased use of adjuvant systemic treatment. HER-2 overexpression decreases with age and age related differences in ER and PR expression as well as tumor grading are observed (Fig 2). Citation Information: Cancer Res 2009;69(2 Suppl):Abstract nr 2082.