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Long-term eribulin treatment in patients with a single kidney and retroperitoneal liposarcoma.

Retroperitoneal sarcomas are extremely rare malignant tumors. The most common type of sarcomas arising in the retroperitoneum are liposarcomas, occurring mostly in the sixth and seventh life decades. The only potentially curative approach to liposarcomas is the complete surgical resection of the tumor with negative microscopic margins. However, retroperitoneal liposarcomas exhibit a propensity for local recurrence and distant metastasis despite the negative surgical margins, thus requiring additional therapy. Eribulin demonstrated a benefit in terms of overall survival in patients with advanced or metastatic liposarcoma. We report two cases of patients, both submitted to concomitant right nephrectomy, who experienced a long-lasting control of recurrent retroperitoneal liposarcoma before being submitted to eribulin-based therapeutic regimens (23 and 24 treatment cycles completed, respectively).