A critical question about cancer is whether or not it has spread to other organs in your body. Cancer starts when cells begin to divide uncontrollably. Eventually, these cells form a visible mass, or tumor. This initial tumor is called the primary tumor.
Cells from the primary tumor can break off and lodge elsewhere in the body, where they then grow into secondary tumors. This process is called metastasis, which means that the cancer has spread.
Find out more about this book:The 10 Best Questions for Surviving Breast Cancer: The Script You Need to Take Control of Your Health