Biogen Idec Inc.'s (BIIB) second-quarter earnings fell 1.8% on acquisition-related and other charges.

The biotechnology company's adjusted profit narrowly missed analysts' expectations.

The company and Swedish Orphan Biovitrum (BIOVF, SOBI.SK, SWTUY) announced that their treatment for severe hemophilia was longer-lasting than a commercially available product in an early study. The finding will be presented Tuesday at a Congress of International Society on Thrombosis and Haemostasis conference in Kyoto, Japan.

For the year, the company raised its revenue growth estimate to the low to mid single digits on a percentage basis from February estimate of up to the low single digits, as if affirmed its per-share earnings forecast.

Biogen has seen core earnings climb on higher revenue in recent quarters, though restructuring charges have weighed on its bottom line. The company's portfolio of multiple-sclerosis drugs represented about 74% of its revenue last year, though it has been refocusing itself around developing neurology treatments as well as its current MS drugs.

In the latest quarter sales of Tysbari, which is sold with Elan Corp. (ELN) were up 28%, while sales of fellow MS treatment Avonex--its biggest seller---grew 5%. Rituxan revenues from its joint venture with Roche Holding AG's (RHHBY, ROG.VX) Genentech Inc. unit fell 29% owing to a continuing arbitration issues.

Biogen reported a profit of $288 million, or $1.18 a share, from $293.4 million, or $1.12 a share, a year earlier. Excluding acquisition- and restructuring-related costs and other items, earnings rose to $1.36 from $1.31.

Revenue edged down 0.3% to $1.21 billion.

Analysts polled by Thomson Reuters most recently forecast earnings of $1.37 on revenue of $1.18 billion.

Shares closed Monday at $103.99 and were inactive premarket. The stock is up 55% this year.

-By Tess Stynes, Dow Jones Newswires; 212-416-2481; Tess.Stynes@dowjones.com