Oral etoposide in heavily pre-treated metastatic breast cancer: A retrospective study.

e13070 Background: Patients with metastatic breast cancer can derive clinical benefit from several subsequent lines of chemotherapy. However, in heavily pre-treated patients, agents with clinical activity, a favourable side effects profile and a convenient administration modality are preferred. Oral etoposide may be an interesting treatment option in this group of patients. Methods: This was a retrospective observational study performed in single institution in 22 patients with MBC refractory to prior anthracycline, taxane, and capecitabine therapy. All patients were treated with oral etoposide at 50 mg/day on days 1-20. Treatment cycles were repeated every 28 days. Results: The median age were 53 years (42-68). The median number of previous chemotherapy lines was 5 (range 2-7). There were no complete or partial responses. Median PFS was 7 months. In 5 patients, the disease stabilized for over 12 months. Interestingly, etoposide activity was unrelated to the number of previous lines and type of metastatic involvement. Oral etoposide was well tolerated with only one patients discontinuing therapy due to toxicity. Conclusions: In real practice oral etoposide is a valuable and safe option for pre-treated metastatic breast cancer patients and might be considered in patients failing other approaches, but still suitable for chemotherapy.