Cancer

Primary and metastatic tumors are two locational terms used to describe cancer and its' spread. Your primary tumor (lung, liver, colon, etc.) is the original tumor. Metastatic tumors travel from the primary tumor to other organs (brain, skin, prostate). For example, if you are diagnosed with breast cancer and found to have another tumor in your lungs, the lung tumor would be metastatic (traveling) while the breast cancer would be the primary tumor.