Great news!
If I've got this right, Grade 3 refers to how different the cells have become - 1 being fairly normal looking, 2 showing significant change and 3 looking completely different. The Ki count refers to the aggressiveness of the cancer cells - higher numbers are faster dividing. Stage refers to how far in the body it has spread (this is then dividing into a, b...) - 1 is very early and local, 2 is in the breast only, 3 has spread to nodes, 4 is in the rest of the body.
Anybody - if I've got this wrong please correct me!