Dear rbaker: In short, this report is saying that you have breast cancer with spread to the lymph nodes in your underarm. Many of these big words and fancy markers are further descriptors of the cancer cells. Metaplastic carcinoma is one of many subtypes of breast cancer. Poorly differentiated means that the cells do not resemble normal breast cells. In all, these terms suggest that this cancer may be more aggressive. There is data that suggests that chemotherapy prior to surgery has equal survival outcomes and may offer the advantage of addressing microscopic metastasis early in the course of the treatment, rather than waiting until a person is healed from surgery. Preoperative chemotherapy may also allow for a smaller surgical procedure.