Study Evaluating Hemay022 In Subjects With HER2-Positive Advanced Breast Cancer

This is a phaseⅠsequential-group study of ascending single and multiple oral doses administered to subjects with HER2-Positive Advanced Breast Cancer. Each subject will receive a single dose of Hemay022, followed by a 1-week observation period, and then will receive Hemay022 administered once daily by mouth for 28 days. Each cycle consist of 28 days. Subjects will be enrolled in groups of 3 to 6. Depending on the safety and activity profile observed during the dose escalation phase, the dose selected for Part 2 may be adjusted. Part 2 is an extension part of three dose groups.