The t, n, m system classifies breast cancers based upon tumor size(t), lymph node status(n), and presence of cancer
elsewhere in the body(m).
Stage i is limited to small cancers +/- microscopic ln disease. Stage ii describes tumors 2-5cm +/- ln disease. Stage iii is for more advanced tumors (>5cm, skin/chest wall involvement) +/- multiple/distant ln. Stage IV describes metastatic disease.