Aromatase inhibitor. Aromatase inhibitors (AIs) are a class of drugs used in the treatment of breast cancer in postmenopausal women and gynecomastia in men. They may also be used off-label to reduce increase of estrogen conversion during cycle with external testosterone. They may also be used for chemoprevention in high risk women.
Supporters of the Keystone XL Pipeline herald it as a job-creating machine, producing as many as 119,000 jobs. But only 3,900 workers will actually be required to build the pipeline to carry oil from Canada to the Gulf of Mexico, according to the U.S. State Department, and those jobs will only last for a year. There will be 35 permanent positions created.
TransCanada, the company that will build the pipeline, also estimates that thousands of jobs would be created during construction. In a January 2012 forecast, it pegged the number at 20,000 jobs, split between 13,000 in construction and 7,000 in manufacturing.