UPDATE 3-Gilead bags blood disorder drug with YM BioSciences buy
* Says to buy YM for $510 mln, or $2.95 per YM share
* To begin pivotal trial of YM's drug in 2nd half of 2013 (Adds deal value including options; updates shares)
Dec 12 (Reuters) - Gilead Sciences Inc said it would buy Canada's YM BioSciences Inc for about $510 million in cash, getting access to a second experimental drug to treat a rare blood and immune cell disorder.
Gilead shares closed down 0.14 percent at $76.23 on the Nasdaq, while YM's U.S.-listed shares closed up 77 percent at $2.88, just under Gilead's offer price.
YM's only drug, codenamed CYT387, is being tested in patients with myelofibrosis, a blood disorder with limited treatment options.
Gilead, which is conducting mid-stage trials of its own drug for the disorder, said it will begin a pivotal late-stage clinical trial of CYT387 in the second half of 2013.
Shares of Incyte Corp, which sells the only approved drug to treat myelofibrosis, closed down 6 percent at $16.75 on news of Gilead's deal with YM.
Incyte received $43.7 million from the sale of the drug, Jakafi, in the United States during July-September.
YM took hold of CYT387 with its acquisition of the Australian biopharmaceutical company Cytopia Ltd in 2010. Continued...