Lapatinib Recruiting Phase 2 Trials for Stage IV Breast Cancer / Invasive Breast Carcinoma / Recurrent Breast Carcinoma / HER2 Positive Breast Carcinoma / HER2/Neu Positive / Metastatic Malignant Neoplasm in the Brain / ERBB2 Gene Amplification / Stage IV Breast Cancer AJCC v6 and v7 / Male Breast Carcinoma Treatment