Herceptin is given if you are her 2 +, meaning your cancer has a protein attached that makes it grow. If you are positive you'll likely get it 12 months. It may start with chemo or after chemo depending on your pathology. Mine starts after chemo and I only need it for 6 months as my her 2 is not at a high level. In Australia you will get heart scans before starting and every 3 months.it has been a significant discovery in breast cancer treatment and survival rates