Zoledronate-induced remission of acute panmyelosis with myelofibrosis.

Acute panmyelosis with myelofibrosis is a rare and aggressive form of acute myeloid leukemia. We describe a new case with a huge proliferation of megakaryocytes, blast cells and reticulin fibers. The patient was treated with zoledronate, a third-generation bisphosphonate, and a gradual recovery from pancytopenia was observed. A new bone marrow biopsy performed 4 months later showed a surprising disappearance of the leukemic infiltration. Ten months after the diagnosis, the patient is still in healthy condition. This may support the recently described anti-tumor activity of zoledronate.