Letrozole belongs to a class of drugs known as nonsteroidal aromatase inhibitors. Letrozole decreases the amount of estrogen in the body. Because many types of breast cancer cells require estrogen to grow, this drug may slow or stop the growth of cancer cells. Letrozole is given as a tablet taken by mouth.
Earnings as a Veterinary Surgeon. The lowest-earning 10 percent of veterinarians earned below $46,610 in May 2008, and the highest-earning 10 percent earned above $143,660, according to the BLS.
Most surgeons worked out of private doctors' offices. They earned average annual wages of $241,060, according to the BLS. Surgeons who worked for general medical and surgical hospitals earned $204,970 on average. Those who worked for scientific research and development services received $246,570.