DOW JONES NEWSWIRES 
 

Teva Pharmaceutical Industries Ltd. (TEVA, TEVA.TV) said it won approval from the U.S. Food and Drug Administration to commercially launch a generic version of AstraZeneca PLC's (AZN, AZN.LN) breast-cancer drug Arimidex.

According to the generic-drug giant, AstraZeneca's brand product had annual sales of about $916.8 million in the U.S., based on IMS sales data.

Patents on some of AstraZeneca's biggest drugs are set to expire in the next few years, which is forcing the company to scramble to come up with replacements. In January, the company said it would trim about 16% of its work force, as it said it is facing a tough 2010. Arimidex and Pulmicort for asthma are expected to lose sales as they face competition from low-cost generic copies.

AstraZeneca had received a six-month extension for its exclusivity patent for Arimidex, which had been due to expire in December, to allow the manufacturer time to investigate the potential benefits of the treatment in pediatric conditions that manifest symptoms resulting from increased estrogen production. At the time, AstraZeneca said it wouldn't seek an indication in those benefits based on trial results.

Teva's American depositary shares fell 1.3% to $51.57 in recent trading, while AstraZeneca's ADSs were down 5 cents to $44.84.

-By John Kell, Dow Jones Newswires; 212-416-2480; john.kell@dowjones.com