Summary
The primary purpose of the Dose Optimization (Part 1) of this study is to assess the
safety and tolerability of BB-1701 and to determine the recommended dose (RD) of BB-1701
for Dose Expansion (Part 2). The primary purpose of Dose Expansion (Part 2) is to assess
the antitumor activity of BB-1701 at RD in the selected population(s) of breast cancer
(BC).