A mid-sized jet, the 757 isnât nearly the size of a 747 or 777, but thanks to a nasty aerodynamic quirk it produces an outsized wake that, according to one study, is the most powerful of any airplane. To avoid wake upsets, air traffic controllers are required to put extra spacing between large and small planes.
Causes: Colorectal cancer: All kinds of cancer occur when cell division, normally a very highly regulated process, gets out of control. While environmental factors can certainly contribute to a person's risk of cancer (e.g. smoking, diet, and exercise), most cancers have a genetic basis too.
Chemotherapy drugs. The most common chemotherapy drugs used to treat colorectal cancer are: 1  5-fluorouracil (5-FU, Adrucil). 2  given by intravenous intravenousWithin or into a vein (a blood vessel that carries blood from tissues and organs in the body to the heart). 3  injection, either intermittently or as a continuous infusion.