“…Ten studies described the results of phase I trials [13,17,[20][21][22][23]27,28,31,32], one described those of a phase I/II trial [15], four studies involved a phase II design [10,25,26,33] and one study involved a phase III design [12]. Four studies were conducted in the neo-adjuvant setting [22,23,26,33], while all the others dealt with recurrent, metastatic or refractory disease patients [10,12,13,15,17,20,21,25,27,28,31,32]. Three studies were conducted on hormone receptor (HR) positive metastatic breast cancer patients [10,12,28], and three studies were conducted in a HER2-positive metastatic setting [15,20,21], while in six studies the distinction between subtypes of breast cancer patients was not made [13,17,25,27,31,32].…”