I am told that it is very aggressive. It was first found in the lung and kidney area. It has since been discovered in the brain. I have found your information to be very helpful. I really appreciate your understanding and am thanking you in advance for any assistance you can provide.
Every cancer is different with respect to the speed with which it grows and spreads.
In fact, cancers may change their growth rates. The differentiation of a tumor refers to how the cells look under the microscope. Cells that look normal are termed well differentiated. On the other hand, if the cells appear very abnormal they are termed poorly differentiated. Poorly differentiated cancers, like your father's, tend to grow quicker than well differentiated tumors, and moderately differentiated tumors fall in between.