Successful treatment of malignant pericardial effusion, using weekly paclitaxel, in a patient with breast cancer.

We report a case of metastatic breast cancer with pericardial effusion that was successfully treated with weekly paclitaxel. A 46-year-old woman underwent modified radical mastectomy in April 1997 and was readmitted to the hospital for dyspnea in March 2002. A diagnosis of cardiac tamponade due to breast cancer relapse was made, and the patient was treated with weekly paclitaxel (80 mg/m2) and insertion of a drainage catheter. This treatment was effective in preventing reaccumulation of the pericardial effusion until her death. The concentration of paclitaxel in the cardiac effusion was 45 ng/ml at 3 h, 15 ng/ml at 12 h, and less than 10 ng/ml at 24 h after paclitaxel infusion, indicating good transportation of the drug from the blood to the pericardial effusion. These findings suggest that weekly intravenous infusion of paclitaxel could be effective for the treatment of patients with malignant pericardial effusion.