Invasive breast cancer. Invasive primary breast cancer is breast cancer that has the potential to spread from the breast to other parts of the body. The most common type of invasive breast cancer is invasive breast cancer of no special type (sometimes called invasive ductal cancer).nvasive breast cancer. Invasive primary breast cancer is breast cancer that has the potential to spread from the breast to other parts of the body. The most common type of invasive breast cancer is invasive breast cancer of no special type (sometimes called invasive ductal cancer).
), is a country in northern Eurasia. It is a federal semi-presidential republic. At 17,075,400 square kilometres (6,592,800 sq mi), Russia is the largest country in the world, covering more than one-eighth of the Earth's inhabited land area. Russia is also the world's ninth most populous country with nearly 144 million people in November 2014.
Topography. The East European Plain encompasses most of European Russia. The West Siberian Plain, which is the world's largest, extends east from the Urals to the Yenisey River. Because the terrain and vegetation are relatively uniform in each of the natural zones, Russia presents an illusion of uniformity. Nevertheless, Russian territory contains all the major vegetation zones of the world except a tropical rain forest. About 10 percent of Russia is tundra, or treeless, marshy plain.