In metastatic breast cancer, Herceptin can be used in the following ways: • on its own in patients who have failed on at least two previous treatments; • in combination with paclitaxel or docetaxel (other anticancer medicines); • in combination with an aromatase inhibitor (another type of anticancer medicine), in women who have been through the menopause and whose cancer also expresses receptors for hormones such as oestrogen or progesterone on its surface.