Safety of Continuing CHemotherapy in Overt Left Ventricular Dysfunction Using Antibodies to HER-2

Trastuzumab is an important treatment for HER 2 positive breast cancer. But trastuzumab can cause injury to the heart, and this is one of the main reasons it cannot be administered as planned. Heart injury can often be successfully treated using cardiac medications. The aim of SCHOLAR is to evaluate whether it is safe to continue trastuzumab in individuals with mild or moderate cardiac injury, while treating them with appropriate cardiac medications. In this way the investigators hope to be able to optimise the delivery of a treatment to patients with breast cancer that has proven survival benefits, especially when administered for a full 12-month course.