Decision-making for treatment of metastatic breast cancer after the second line of chemotherapy was limited by the lack of established predictive factors of benefit for further chemotherapy regimens. Eribulin has emerged as the only single agent demonstrating an overall survival improvement in the third-line setting or beyond. The purpose of this study was to define the clinical profile of metastatic breast cancer participants achieving long-term benefit from chemotherapy with eribulin in the third-line setting or beyond.

This was a multicenter, retrospective, observational, case study analysis to assess long-term eribulin treatment in metastatic breast cancer. The study was conducted in 26 Spanish hospitals participating in a national pre-market access program to eribulin between 2011 and 2014. An exploratory comparison with a group of short-term responders included in a similar observational study was performed.

Inclusion criteria:

• Participants with Advanced or Metastatic Breast Cancer on Eribulin for at least 7 months

Exclusion criteria:

• Lack of accessible clinical records

Participants with Advanced or Metastatic Breast Cancer on Eribulin for at least 7 months