Study of the JAK Inhibitor Ruxolitinib Administered Orally to Patients With Primary Myelofibrosis (PMF), Post-Polycythemia Vera-Myelofibrosis (PPV-MF) or Post-Essential Thrombocythemia-Myelofibrosis (PET-MF)

"Starting dose of ruxolitinib for cohort 1 in dose escalation phase - 5mg twice a day (BID)~Doses will be increased a total of approximately 5mg for successive dosing cohorts based on baseline platelet count"