Lucia Masarova, MD, The University of Texas MD Anderson Cancer Center, Houston, TX, outlines the results of a retrospective analysis evaluating the prognostic value of circulating peripheral blood blasts in cohorts of patients with primary myelofibrosis who were treated with/without ruxolitinib. This interview was recorded via an online conference call with The Video Journal of Hematological Oncology (VJHemOnc).