CARACTERÍSTICAS CLÍNICO-PATOLÓGICAS Y SOBREVIDA DE PACIENTES CON CÁNCER DE MAMA BILATERAL SINCRÓNICO

Clinicopathological features and survival of patients with bilateral synchronous breast cancer Introduction: Bilateral synchronous breast cancer (BSBC) has a variable incidence and conflicting data on prognosis. Our goal is to evaluate the characteristics and survival of patients with BSBC treated at Cancer Center of the Pontificia Universidad Catolica de Chile. Patients and Methods: Descriptive study. We identified patients treated between January 1999 and May 2013. We evaluated and compared characteristics from BSBC patients with a local cohort of non-synchronous breast cancer. Results: The incidence of BSBC was 1.8% (n = 28). Three patients were excluded because of missing data. Therefore we analyzed 25 patients (50 tumors). Median age: 50 years (33-84). The dominant tumors diagnosis was clinical in 47.6% of cases, and imaging in 90.5% of the contra-lateral non-dominant (p = 0.04). Average tumor size of invasive tumors was 2.5 cm for dominant tumor versus 1.7 cm for the non-dominant (p = 0.02). 81.4% of invasive tumors were estrogen receptor (ER) positive. Histological and subtype concordance between both tumors was 88% and 72% respectively. 54% of patients with BSBC were managed with total mastectomy versus 28.4% in the control group no BSBC (p = 0.0001). The estimated overall survival at 10 years was 76.5% in patients with no BSBC versus 62% in those with BSBC (p = 0.08). Conclusions: The BSBC is rare. Frequently they are ER positive tumors, mostly diagnosed through images and managed with less conservative surgery.