The Case of the Terrible Toxicities.

The article discusses the case study of a woman, who had a bilateral mastectomy with reconstructive surgery. It mentions that final pathology showed residual disease in the breast and one lymph node, and her oncologist recommended adjuvant therapy with capecitabine. It mentions that unexpected side effects may indicate that a patient on capecitabine or 5-fluorouracil (5-FU) has a metabolic deficiency leading to toxic levels of the drug's metabolites.