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UPDATE 2-AbbVie's profit beats on Humira, Imbruvica demand

* Q2 sales edge past estimates

* Humira sales rise 13.7 pct, beat analyst estimates

* Co reiterates 2017 adjusted profit forecast (Adds details, shares)

July 28 (Reuters) - U.S. drugmaker AbbVie Inc reported quarterly earnings on Friday that edged past analysts' expectations, helped by robust demand for its flagship rheumatoid arthritis drug, Humira.

Sales of Humira, the world's top selling drug, rose 13.7 percent to $4.72 billion in the second quarter ended June 30, beating analysts' average estimate of $4.64 billion, according to Barclays.

Humira, which is used to treat autoimmune disorders, faces looming competition from copycat versions in the United States.

AbbVie has been trying to block the launch of Amgen's Humira knock-off. Meanwhile, earlier this year, the U.S. patent office ruled in favor of Coherus Biosciences' Humira copy, in a move that analysts say could advance its U.S. launch by a year.

AbbVie's cancer drug Imbruvica, which it jointly owns with Johnson & Johnson, raked in sales of $626 million, above consensus estimates of $609 million.

However, sales of its hepatitis C treatment, Viekira Pak, came at $225 million, well below consensus expectations of $257 million.

Another hepatitis C regimen from AbbVie is expected to hit the market later this year and could eat into the sales of rival products from Gilead Sciences Inc and Merck & Co Inc .

AbbVie's net earnings rose to $1.92 billion, or $1.19 per share in the second quarter, from $1.61 billion, or 98 cents per share, a year earlier.

Excluding one-time items, the company earned $1.42 per share, beating analysts' estimates of $1.40 per share, according to Thomson Reuters I/B/E/S.

AbbVie's net revenue rose 7.6 percent to $6.94 billion. Analysts on average had expected $6.93 billion.

Shares of the company, which maintained its forecast for full-year adjusted profit, were marginally up at $72 in premarket trading. (Reporting by Natalie Grover and Manas Mishra in Bengaluru; Editing by Arun Koyyur)