Re: Is breast cancer a more aggressive cancer than prostrate cancer
Adenocarcinoma refers to any cancer originating in any epithelial glandular tissue. There are many different kinds of epithelial glandular tissue in our bodies -- all very different, in which different genes and proteins are active. It also includes colon cancers, lung cancers, pancreatic cancers, and many more.
Aggressiveness has more to do with how well differentiated it is. The more it looks like the ductal or glandular tissue it came from, the less it is able to survive outside its original environment, and the less aggressive it is. Highly undifferentiated cells are like stem cells and can metastasize and grow outside of the gland. They may grow and divide quickly and establish their own blood supply.
All of these cancers may be symptomless in early stages and reach the undifferentiated stage without being noticed. Some, like prostate and breast cancers, may be hormone responsive in some of their types or stages. Others do not depend on hormones for growth.
It is true that once they reach the stage where they metastasize and become hormone refractory, they are all pretty similar in appearance. In fact, it may be difficult to ascertain where the primary tumor originated in some cases.