Invasive Breast Cancer – The cancer cells have grown through the lining of the ducts into the surrounding breast tissue. NST stands for No Special Type.
Special type means that when the doctor looks at the cancer cells under a microscope, the cells have particular features. Breast cancers that are classed as special type include lobular breast cancer and some rare types of breast cancer.
Most invasive breast cancers have no special features and so are classed as No Special Type. NST is also sometimes called NOS (not otherwise specified). It used to be called ductal carcinoma.