Efficacy and Resistant Mechanism of Eribulin and Bevacizumab for Advanced HER2 Negative Breast Cancer

This study is a prospective, multicenter, phase II randomized clinical trial. It is planned to enroll 60 patients with advanced HER2 negative breast cancer, who will be randomly assigned to the experimental group and the control group in a 1:1 ratio. The participants will receive either eribulin combined with bevacizumab or eribulin monotherapy. Every treatment cycle will last for 21 days, with weekly monitoring of blood routine, blood biochemistry and other indicators. Imaging examinations will be conducted every two cycles and the efficacy will be evaluated according to RECIST 1.1 standard. The life quality questionnaire is arranged at baseline and every 3 months after enrollment, and the long-time survival will be followed every 3 months after treatment. The primary endpoint is progression-free survival (PFS), the secondary endpoints are objective response rate (ORR), clinical benefit rate (CBR) and overall survival (OS). The investigators will also focus on the treatment-related adverse events (TRAE) and quality of life (QoL) assessment. At the same time, this study also aims to explore the resistant mechanisms of anti-angiogenic drugs. The investigators plan to collect peripheral venous blood samples at 3 time points: baseline, during treatment, and end of treatment. All the dynamic samples will be used for transcriptome sequencing to obtain the gene sets. And based on the optimal therapeutic efficacy, all the participants will be divided into response group and non-response group. GO and KEGG enrichment analysis will be subsequently performed between different therapeutic efficacy groups to draw gene interaction networks, identify key action nodes and explain the mechanism of anti-angiogenic drug resistance.