Where the cancer starts is called the primary tumour. Some types of cancer, called leukaemia, start from blood cells. They don't form solid tumours. Instead, the cancer cells build up in the blood and sometimes the bone marrow. For a cancer to start, certain changes take place within the genes of a cell or a group of cells.
pommel horse. n. 1. A piece of gymnastic equipment that consists of a padded, loaf-shaped object with two pommels on top and stands horizontal to the floor, usually on adjustable legs. 2. An athletic event in which the pommel horse is used.
Wooden horse. A wooden horse is a torture device, of which there exist two variations. The first is a sharply angled device with the sharp point of the angle pointing upward, mounted on a saw-horse like support. The victim is made to straddle the triangular horse and place her full body weight on her vulva, which rested on the point of the angle.