What type of sample is needed to perform the Oncotype DX test?
The Oncotype DX process is performed using a very small sample of the tumor tissue that was removed during a woman’s lumpectomy or mastectomy. This means that no additional surgery is needed for this test. In the United States, tumor samples are commonly treated with a preservative called formalin and then embedded in paraffin wax to form a small block. The Oncotype DX process is designed for use with a small sample from this type of tissue block.
