What term describes cancer that is well developed and has spread to several organs in the body?

The term that describes cancer that is well developed and has spread to several organs in the body is Stage IV cancer. This stage indicates that the disease is no longer confined to its original site and has metastasized, meaning cancer cells have traveled through the bloodstream or lymphatic system to other parts of the body. Stage IV represents the most advanced level of cancer, reflecting significant progression from the earlier stages, which are typically characterized by more localized disease. Early stages like Stage I and Stage II usually indicate that the cancer is still relatively localized and hasn't spread to distant organs, while Stage III suggests more extensive local spread, but not to multiple organs.