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The aim of the study was to evaluate the activity of neratinib in LM from HER2-positive BC after the failure of multiple lines of treatment. PATIENTS AND METHODS Inclusion criteria were as follows: age ≥ 18 years; histological diagnosis of primary HER2-positive BC; newly-diagnosed LM (LANO criteria); KPS ≥ 60; coexistence of BM that have or not received radiotherapy; life expectancy ≥ 3 months; previous drugs, including capecitabine, trastuzumab, T-DM1, pertuzumab, and hormone therapy, were allowed, with the exclusion of lapatinib or other investigational agents. Neratinib was administered 240 mg daily continuously. Primary endpoint was the OS. Secondary endpoints were progression-free survival (PFS), neurological benefit, radiological response rate, and tolerability. RESULTS Nine patients with LM have been enrolled with a median age of 44 years, and a median KPS of 80. Median time since LM onset from the diagnosis of primary BC was 42 months, and patients underwent a median number of adjuvant treatments before LM of 3. Three patients developed LM alone, and other 6 had LM associated with multiple BM. Six-months and 1-year OS were 66.7% and 22.3%, respectively, with a median OS of 8 months (95%CI 3-13*). Median PFS was 3.5 months (95%CI 2-6) after the start of treatment. A neurological improvement was reported in 2/9 patients (22.2%), while in other 4/9 patients (44.5%) was achieved a neurological stabilization lasting for a median time of 5 months (95%CI 2-19). The best radiological response was a stable disease in 5/9 patients (55.6%), while no complete or partial were achieved according to LANO criteria. A CSF clearance was observed in 1 patient only (11.1%). Grade III-IV adverse events were not reported, and 2 patients only (22.2%) had mild diarrhea correlated with neratinib. CONCLUSIONS Neratinib might be a safe and effective treatment in LM from heavily pretreated HER2-positive BC.

CTNI-02. NERATINIB FOR TREATMENT OF LEPTOMENINGEAL METASTASES FROM HER2-POSITIVE BREAST CANCER IN EXTENDED ACCESS PROGRAM: PRELIMINARY RESULTS