Turns out a specific type of protein aids in spreading of cancer. A new study has discovered how Ras protein binds itself to cell membranes impacting the signaling pathways that cause cancer's uncontrolled growth. Researchers at the University of Illinois have been able to study precisely how Ras proteins interact with cell membrane surfaces. They studied protein systems such as Ras and how they make up the complex signaling pathways that control whether a cell divides or in some cases becomes cancerous and metastasizes into other regions of the body. For example 98 percent of pancreatic cancers show Ras protein mutations.