By Jonathan D. Rockoff and Peter Loftus 

AbbVie Inc. said late Wednesday it will buy cancer biotech Pharmacyclics Inc. in a $21 billion deal that returns the North Chicago, Ill., drug company to deal-making after backing away from a big tax-lowering takeover last year.

The deal, a mix of cash and stock for $261.25 a share, would give AbbVie a presence in the multibillion-dollar blood-cancer market, and lessen its reliance on an aging rheumatoid-arthritis drug that accounts for most of its sales.

AbbVie had reached a $54 billion agreement to buy Irish drug company Shire PLC last year, before abruptly walking away after the Obama administration took steps to deter such tax-lowering deals.

AbbVie said it expects the deal to close in the middle of this year.

Pharmacyclics, of Sunnyvale, Calif., sells a drug called Imbruvica with partner Johnson & Johnson. Imbruvica has been approved for two blood cancers--a rare lymphoma and a form of leukemia. In January, the Food and Drug Administration greenlighted Imbruvica's use for a rare form of cancer affecting the immune system.

In its first full year on sale, the pill had $548 million in world-wide net product revenue last year, Pharmacyclics reported. The company projects sales will reach $1 billion this year.

Some analysts, citing Imbruvica's impressive performance in clinical trials, estimate sales could peak at $5 billion a year.

AbbVie will be counting on such high sales. Pharmacyclics shares began the year at $124.46, before rising on reports in recent weeks that the company was up for sale.

The deal also would give AbbVie an experienced sales force for marketing to doctors who treat blood cancers, which would be especially helpful if AbbVie's own blood-cancer drug in development makes it to market.

AbbVie has a partnership with Roche Holding AG to co-develop venetoclax, or ABT-199, for patients with chronic lymphocytic leukemia. AbbVie may file for regulatory approval of the drug later this year, pending results from a clinical trial.

AbbVie has been looking to branch out beyond its reliance on rheumatoid-arthritis therapy Humira. It is AbbVie's biggest-selling product, notching $12.5 billion in sales in 2014, more than 60% of the company's total revenue. But a key U.S. patent for the drug expires in late 2016, and equivalent patents expire in the majority of European countries in 2018. The patent expirations could trigger the introduction of competing, "biosimilar" copies of Humira, eroding sales of the brand.

But some analysts question whether Imbruvica can reach the lofty sales targets, unless it can prove effective against other kinds of tumor types and perhaps different diseases--a big risk.

Another issue for AbbVie will be sharing Imbruvica with a rival drug company. J&J helps sell Imbruvica and splits the profits from the drug under the terms of a 2011 deal with Pharmacyclics.

For Pharmacyclics, a takeover would culminate a topsy-turvy history. It bought the molecule that became Imbruvica during a fire sale by gene-sequencing company Celera Genomics in 2006.

J&J said in a statement that the deal confirms the potential it saw in Imbruvica and the company is "looking forward to continuing our collaboration with the team at AbbVie."

Write to Jonathan D. Rockoff at jonathan.rockoff@wsj.com and Peter Loftus at peter.loftus@wsj.com

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