Here's what I found a while back when seeking info about tumor necrosis. 1) Necrosis in the tumor means that the cancer cells in that area are dead. The pathologic finding of necrosis suggests a fast-growing cancer. This often happens because the tumor runs out of blood supply in the central portion. Without a blood supply, the tumor cells cannot live.
In association football, where the shoes themselves are known as football boots, there are three different cleat types. There are soft ground cleats which are made for wet weather. The soft ground cleats are always replaceable, and are almost always metal, so when they wear down they are easy to replace.
STUDS/CLEATS: The blades or cones on the bottom of many soccer shoes to improve traction. The stud itself is often called a cleat and can be fixed/molded or detachable on the bottom of the shoe. Typically, there are three main types of studs: bladed, hard ground and round/conical.