--Gilead to acquire YM BioSciences for $510 million in all-cash deal

--YM's lead drug is a potential competitor to Incyte and Novartis

--The deal comes as Gilead continues to expand its product pipeline beyond HIV and AIDS

(Updated throughout with additional detail, quotes from analysts, and updated stock prices.)

 
   By Joseph Walker 
 

Gilead Sciences Inc. (GILD) agreed to buy YM BioSciences Inc. (YMI) for $510 million in cash, as the drug company looks to boost its cancer-drug portfolio.

The deal strengthens Gilead's efforts to expand beyond its core HIV and AIDS franchises and gives it the potential to compete in the lucrative market for hematology drugs, which treat patients with blood cancer. But YM's lead drug, CYT387, is its only one in clinical trials and still years away from reaching the market. The experimental drug will have to prove its effectiveness in a late-stage trial that Gilead said it intends to begin in the second half of 2013.

"This acquisition represents an opportunity to add a complementary clinical program in the area of hematologic cancers to our growing oncology portfolio," said Norbert W. Bischofberger, Gilead executive vice president of research and development, in a statement.

Gilead will pay a per-share price of $2.95, an 81% premium over YM's Tuesday closing price. Shares of YM recently surged 72% to $2.86. Gilead plans to fund the acquisition with cash on hand. The transaction is expected to close in the first quarter.

That Gilead agreed to pay a high premium to buy YM, and without the milestone payments typical of many biopharma mergers, suggests that other large pharmaceutical firms may have been interested in buying the Toronto-based company, some analysts said. It's may also be a reflection of Gilead's strong cash position and its desire to complete the deal quickly.

"It's a very clean deal and one they can close fairly rapidly," said Ian Somaiya, a Piper Jaffray analyst. "It also probably points to the fact that there were multiple parties involved" in negotiations.

The acquisition comes at a time when Gilead is aggressively looking to broaden its drug pipeline beyond the HIV and AIDS drugs that generate the vast majority of its revenues. Last year, it acquired hepatitis C drug maker Pharmasett Inc. for $11 billion in cash.

While some investors questioned the Pharmasett deal at the time, it has since appeared to pay off as shares soared 86% this year to $76.76 through Tuesday's close, largely on the perceived strength of its hepatitis C assets. Gilead shares recently rose 32 cents to $76.66.

With the purchase of YM, Gilead gains an experimental drug to treat myelofibrosis, a type of chronic leukemia. The treatment, known as CYT387, is the same class of drug as Jakafi, a treatment marketed by Incyte Pharmaceuticals (INCY) and Novartis AG (NOVN). Jakafi was the first drug approved by the FDA in 2011 to specifically treat myelofibrosis. The drug is on pace to generate $130 million in revenues in 2012, said Christian Glennie, an Edison Investments analyst.

However, peak sales could eventually reach between $500 million and $1 billion, Mr. Glennie said.

Incyte shares fell 7% to $16.66; Novartis fell 10 cents to $58.75.

Other firms, including Sanofi S.A. (FR:SAN) and Cell Therapeutics Inc. (CTIC), are also developing drugs known as Jaks, which work on the Janus kinase enzymes, which are believed to be one of the root causes of myelofibrosis. Cell Therapeutics rose 5% to $1.36, while Sanofi fell 15 cents to $71.85.

YM's drug has shown positive results in a mid-stage trial, and has the potential to improve on areas where Incyte and Novartis's drug has shortcomings, like decreasing patients' reliance on blood transfusions, Mr. Glennie said.

Gilead has a number of cancer drugs in development, including one non-Jak drug treating myelofibrosis patients in a mid-stage trial, with data expected by analysts in the first half of 2013. The acquisition also provides Gilead the potential to combine that pipeline drug with YM's in future trials, Mr. Glennie said.

CYT387 also has the potential to treat other types of inflammatory diseases and cancers, analysts said.

Myelofibrosis is a progressive, chronic bone-marrow disorder in which the marrow is replaced by fibrous scar tissue, making it difficult for the bone marrow to sufficiently produce blood cells.

Saabira Chaudhuri contributed to this report.

Write to Joseph Walker at joseph.walker@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires