Population-based Estimate of the Prevalence of HER-2 Positive Breast Cancer Tumors for Early Stage Patients in the US

ABSTRACT

The goal of this study was to estimate prevalence of HER-2 positive tumors in a population-based sample of 1026 women diagnosed in 2005 with early stage breast cancer. We modeled the relationship between patient and tumor characteristics and HER-2. HER-2 positive estimates were 19% for women aged ≤49 years and 15% aged ≥50 years. HER-2 varied by tumor grade and size in women aged ≤49 years but was not significant in multivariate analysis. Tumor grade and race were associated with HER-2 for women aged ≥50 years after controlling for other variables. HER-2 varies by age and by race and tumor in older women.

Keywords: :

• Breast carcinoma
• HER-2/neu
• Population-based study
• SEER program