General information
Cancer
CANCER
A total of 33 patients with ER+/HER2- MBC progressed on previous treatment of anastrozole or letrozole in the Guangxi Medical University Cancer Hospital were recruited between April 2017 and November 2019. Two cases who did not take apatinib and one who only underwent 3 days of treatment were excluded. Finally, 30 cases were included in the analysis (Flowchart of the participants through the trial (CONSORT diagram).Patient characteristics (