One is diagnosed with metastatic cancer when during their first screening, cancer cell occurs about 6% of the overall time. This in itself is considered to be stage 4 of cancer as it is more severe than others, but also, there are some categories even within this:
MX: Whether there is spread into distant tissues or not, cannot be evaluated.
M0: There is no evidence of spread into distant tissues.
M0 (i+): There is microscopic evidence of tumor cells in the blood, bone marrow, or other lymph nodes that are no larger than 0.2 mm.
M1: There is evidence of of cancer cells of considerable size spreading to other part(s) of the body as well.
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