This is a Phase I/IIa, multicenter, open-label, dose-escalation study. The study will be conducted in 6 phases: "2B3-101 single agent dose-escalation phase", "a 2B3-101 with trastuzumab dose-escalation phase", "a Breast cancer brain metastases study-expansion phase","a Recurrent malignant glioma study-expansion phase", "a Melanoma brain metastases study- expansion phase" and "SCLC brain metastases study-expansion phase"