YM BioSciences Reports Updated Phase I/II Data For Its JAK1/JAK2 Inhibitor CYT387 At ASH 2011

*International Working Group for Myelofibrosis Research and Treatment

Constitutional Symptoms Response The majority of patients reporting constitutional symptoms at baseline demonstrated a Complete Resolution or Marked Improvement of their symptoms, including night sweats, pruritus and bone pain.

Safety Results CYT387 is well tolerated in myelofibrosis patients for dosing periods up to and exceeding two years. Reported adverse effects include thrombocytopenia; transient, mild dizziness; mild peripheral neuropathy; and abnormalities in liver/pancreas-related laboratory tests. Treatment emergent anemia and neutropenia were rarely reported.

Poster presentation and YM conference call: The updated results from the Phase I/II study will be presented in a poster session at the 53rd Annual Meeting of the American Society of Hematology. Poster #3849, entitled "Safety and Efficacy of CYT387, a JAK1 and JAK2 Inhibitor for the Treatment of Myelofibrosis", will be presented at Session #634, Myeloproliferative Syndromes: Poster III, being held on Monday, December 12th from 6:00-8:00pm PT in Hall GH of the San Diego Convention Center.

YM will also host a webcast meeting open to members of the investment community to discuss these results. This event will be held from 6:30-7:30am PT on Tuesday, December 13th in the Grand Ballroom of the Hotel Palomar, 1047 Fifth Avenue, San Diego. Access to the webcast will be available from YM's website at www.ymbiosciences.com or at www.newswire.ca. The event can also be heard by dialing in to [phone] or toll-free at [phone].

About CYT387: CYT387 is an inhibitor of the kinase enzymes JAK1 and JAK2, which have been implicated in a family of hematological conditions known as myeloproliferative neoplasms, including myelofibrosis, and as well in numerous other disorders including indications in hematology, oncology and inflammatory diseases. Myelofibrosis is a chronic debilitating disease in which a patient's bone marrow is replaced by scar tissue and for which treatment options are limited or unsatisfactory.

Both the U.S. Food and Drug Administration (FDA) and the European Commission have designated CYT387 an Orphan Drug for the treatment of myelofibrosis.

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