Biogen Idec Inc.'s (BIIB) first-quarter profits rose 35% on growth of its multiple sclerosis drug portfolio, but that performance was trumped by important new data on its oral MS treatment BG-12.

The new data showed the drug's strong effectiveness for the first time, as it did a better job of preventing relapses of debilitating disease than a key rival. The news should position the drug well in the increasingly competitive MS treatment market, possibly giving it a leading position among emerging oral treatments. It could be available to patients as early as next year after a second study is completed later this year.

The news sent Biogen's stock surging, recently trading up 22% to $105.73, by far its highest level ever on a split-adjusted basis. Meanwhile, shares of Teva Pharmaceutical Industries Ltd. (TEVA)--which is developing a oral MS drug laquinimod--fell 8.8% to $44.85, a new 12-month low for the stock.

Chief Executive George Scangos said on the company's earnings conference call that the drug cut relapses by 49% after two years, compared to a placebo, with an annual relapse reduction rate of 53%. The treatment also reduced the progression of disability by 38%, when using a standard measurement. The company said it had a favorable safety profile.

The drug would add to Biogen's MS drug portfolio, which represented 74% of the company's 2010 revenue. Biogen, over the past year, has re-focused the company around developing neurology treatments and its current MS drugs.

Goldman Sach analyst Sapna Srivastava said BG-12 "meaningfully strengthens the sustainability of BIIB's core multiple sclerosis franchise." Leerink Swann analyst Joshua Schimmer added that Biogen is now "poised to dominate MS."

Multiple sclerosis is a chronic, inflammatory condition that occurs when the body essentially attacks its own central nervous system and can be disabling in advanced stages. Biogen's BG-12 was tested in the relapsing, remitting form of the disease, which has flare-ups of the disease rather than consistent progression, and comprises the majority of MS cases. Relapse rate and disability progression are the most common measures of a drug's effectiveness in the disease.

Currently, most MS drugs are given by injection or with intravenous infusion, but the market is getting more competitive and numerous oral drugs are on the horizon. Novartis AG (NVS NOVN.VX) sells Gilenya, the first and only approved MS pill.

Among the most popular treatments are beta-interferons, which reduce disease flare-ups, including Biogen's Avonex, Bayer AG's (BAYRY) Betaseron, and Rebif, which is marketed by Pfizer Inc. (PFE) and Germany's Merck KGaA (MRK.XE).

Teva Pharmaceuticals also makes Copaxone, which seems to fight the nerve-attacking immune cells characteristic of MS by acting as a decoy. Biogen and partner Elan Corp. (ELN, ELN.DB) also sell Tysabri, which prevents the immune cells from leaving the blood stream so that they can't get to the brain or spinal cord.

Last week, data on Teva's oral MS treatment showed it reduced the annual relapse rate in patients taking the drug was reduced by 23%, while disability progression fell by 36%. Teva's pill is taken once-daily, compared to Biogen's twice-daily drug.

"Our excitement for laquinimod hasn't changed," said Jon Congleton, vice president and general manager of Teva Neuroscience, in an interview. He stressed that it is difficult to compare data in different clinical trials because of multiple variables that can affect the outcome.

Biogen, like Teva, lost fast-track designation from the Food and Drug Administration for its MS pill. The agency had originally granted the quicker review to the drugs based on an unmet medical need of not having any oral MS treatments on the market, but that changed with the approval of Novartis's Gilenya.

Overall, the quarterly results from the Weston, Mass., biotech beat analysts' expectations as total revenue rose 8.5% on sales of MS drugs Avonex and Tysabri, sold with Elan Corp., which got boosts in the quarter from December price increases. Biogen is highly dependent on the drugs, responsible for 74% of its revenue in 2010.

In the quarter, Biogen's net income rose to $294.3 million, or $1.20 a share, from $217.4 million, or 80 cents a share, a year earlier. Excluding items, such as restructuring charges, per-share earnings were $1.43 a share, exceeding expectations of $1.41 a share, according to Thomson Reuters.

Revenue was $1.2 billion, beating a projection of $1.18 billion.

The company also backed its 2011 financial projections. It had previously projected full-year earnings of more than $5.70 a share and revenue growth for the year "to be between flat and low single digit" from last year. Analysts currently project the company earning $5.87 a share on revenue of $4.78 billion.

In the first quarter, sales of Biogen's flagship product Avonex rose 8% to $642 million, coming close to Wall Street expectations of $645 million, according to ISI Group.

During the quarter, sales of Tysabri rose 20% to $349 million, beating average analyst expectations of $337 million. Revenue collected by Biogen rose 15% to $251 million. About 58,400 patients were using Tysabri at the end of March, up from 56,600 at the end of December.

-By Thomas Gryta, Dow Jones Newswires; 212-416-2169; thomas.gryta@dowjones.com