Concrete cancer is caused when the steel reinforcing inside concrete rusts. As the steel reinforcing rusts, it expands, causing the concrete around the steel to be displaced. Concrete cancer can be remedied in all building structures. For a successful restoration, the spalled concrete must be removed, and any exposed steel must be cleaned and treated. The area is then reconstructed to the original concrete profile using cement render, epoxy mortar or concrete. The chosen product will depend on the size of the damage and the structural requirements.