BofA Merrill Lynch and Bloom Burton & Co. serve as financial advisors, and Gowling Lafleur Henderson LLP, Heenan Blaikie LLP and Dorsey & Whitney LLP serve as legal advisors to YM in connection with the transaction. Gilead is advised by Wilson Sonsini Goodrich & Rosati, Professional Corporation and Blake Cassels and Graydon LLP.About YM YM BioSciences Inc. is a drug development company primarily focused on advancing CYT387, an orally administered inhibitor of both the JAK1 and JAK2 kinases, which have been implicated in a number of hematological and immune cell disorders including myeloproliferative neoplasms and inflammatory diseases as well as certain cancers. Positive interim results have been reported from a Phase 1/2 trial of CYT387 in 166 patients with myelofibrosis. In addition, YM has several preclinical programs underway with candidates from its library of novel compounds identified through internal research conducted at YM BioSciences Australia. About Gilead Sciences Gilead Sciences is a biopharmaceutical company that discovers, develops and commercializes innovative therapeutics in areas of unmet medical need. The company's mission is to advance the care of patients suffering from life-threatening diseases worldwide. Headquartered in Foster City, California, Gilead has operations in North America, Europe and Asia Pacific. YM Forward-Looking Statement This press release may contain forward-looking statements, which reflect YM's current expectation regarding future events. These forward-looking statements involve risks and uncertainties that may cause actual results, events or developments to be materially different from any future results, events or developments expressed or implied by such forward-looking statements. Such factors include, but are not limited to, shareholder approval of the proposed Arrangement; YM's ability to obtain court, regulatory, and other approvals in connection with the proposed Arrangement; uncertainties as to the timing of the Arrangement; the satisfaction of the conditions precedent to the completion of the Arrangement, including that a governmental entity may prohibit, delay or refuse to grant approval for the consummation of the Arrangement; changing market conditions; the successful and timely completion of clinical studies; the establishment of corporate alliances; the impact of competitive products and pricing; new product development; uncertainties related to the regulatory approval process or the ability to obtain drug product in sufficient quantity or at standards acceptable to health regulatory authorities to complete clinical trials or to meet commercial demand; and other risks detailed from time to time in YM's ongoing quarterly and annual reporting. Except as required by applicable securities laws, YM undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. Gilead Forward-Looking Statement This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks, uncertainties and other factors. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including all statements regarding the intent, belief or current expectation of the companies' and members of their senior management team. Forward-looking statements include, without limitation, the ability of Gilead to advance YM's product pipeline, including CYT387, the possibility that Gilead will be unable to initiate a Phase 3 trial of CYT387 in myelofibrosis as currently anticipated; the possibility of unfavorable results of clinical trials of CYT387, idelalisib and simtuzumab; the expected timing of the completion of the transaction; and the ability to complete the transaction considering the various closing conditions, including that a governmental entity may prohibit, delay or refuse to grant approval for the consummation of the transaction. Investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties and are cautioned not to place undue reliance on these forward-looking statements. Actual results may differ materially from those currently anticipated due to a number of risks and uncertainties. Risks and uncertainties that could cause the actual results to differ from expectations contemplated by forward-looking statements include: the effects of the transaction on relationships with employees, customers, other business partners or governmental entities; other business effects, including the effects of industry, economic or political conditions outside of the companies' control; actual or contingent liabilities; and other risks and uncertainties detailed from time to time in Gilead's Report on Form 10-Q and for the quarter ended September 30, 2012. All forward-looking statements are based on information currently available to Gilead, and Gilead assumes no obligation to update any such forward-looking statements. Additional Information and Where to Find It Further information regarding the transaction will be contained in an information circular that YM will prepare and mail to its shareholders in connection with the YM shareholders' meeting, with closing expected to occur in the first quarter of 2013. YM shareholders are urged to read the information circular once it becomes available, as it will contain important information concerning the proposed transaction. YM shareholders may obtain a copy of the arrangement agreement, information circular, and other meeting materials when they become available at www.sec.gov and www.sedar.com. This press release is for informational purposes only. It does not constitute an offer to purchase shares of YM or a solicitation or recommendation statement under the rules and regulations of the United States Securities and Exchange Commission or other applicable laws.