in the original tumor. This means, for example, that, if breast cancer spreads (metastasizes) to the lung, the secondary tumor is made up of abnormal breast cells, not of abnormal lung cells. The tumor in the lung is then called metastatic breast cancer, not lung cancer.
When tumor cells metastasize, the new tumor is called a secondary or metastatic tumor, and its cells are like those
My tumor has metastasized.