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By Mayo Clinic Staff. Cancer is caused by changes (mutations) to the DNA within cells. The DNA inside a cell is packaged into a large number of individual genes, each of which contains a set of instructions telling the cell what functions to perform, as well as how to grow and divide.
What secondary breast cancer is. A cancer is made up of millions of cancer cells. These form a tumour. The original cancer in the breast is known as a primary breast cancer. Some cells may break away and spread to another part of the body and form a new tumour.This is called a metastasis or a secondary cancer.hat secondary breast cancer is. A cancer is made up of millions of cancer cells. These form a tumour. The original cancer in the breast is known as a primary breast cancer. Some cells may break away and spread to another part of the body and form a new tumour.