Prospective follow-up of a cohort of 112 patients with leptomeningeal metastases of breast cancer recruited from 2007 to 2011: Prognostic factors.

2070 Background: Around 5% of patients with breast cancers (BC) will develop leptomeningeal metastasis (LM). The incidence may increase. Methods: We reported the description and outcome of 112 consecutive BC patients diagnosed with LM in our institution from 2007 to 2011. Correlations between characteristics and overall survival (OS) were analyzed using usual statistical methods (Kaplan Meier, Log-rank, Cox model). Results: BC were invasive ductal carcinoma in 69.7%. Estrogen and progesterone receptors were detected in respectively 61.6 and 44.6%. HER2 expression was observed in 26%. 23% were triple negative. Median time between BC diagnosis and LM diagnosis was 44 months. At LM diagnosis, median age was 54 and median Performance Status (PS) was 2. CSF cytology and cerebrospinal MRI were positive in respectively 72,5% and 87%. 103 (92%) LM patients received IT liposomal cytarabine as 1st line of treatment (ventricular device in 47%). IT therapy could be associated with systemic treatment in 58% of the cas...