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.
PEGASUS. PEGASUS The Flying Steed. Pegasus (Pegasos) in Greek Mythology is the winged horse born when the Greek hero Perseus cut off the Gorgon Medusa's head. Pegasus caused Hippocrene, the fountain of the Muses on Mount Helicon, to well forth with a stroke of his hoof.