Safety, Tolerability, and Efficacy Study in Subjects With Advanced or Metastatic Breast Cancer

Three subjects will be assigned to each of 4 sequential cohorts. Dose escalation may proceed once at least 3 subjects have completed 30 days of study treatment. Subjects who withdraw prior to completing Day 30 for reasons other than DLT will be replaced. If a DLT is observed, additional subjects may be enrolled so that up to 6 subjects are enrolled at that dose level.