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Ann Thorac Surg 1995;60:239-243
© 1995 The Society of Thoracic Surgeons

Original Articles: General Thoracic

Buthionine Sulfoximine Pretreatment Potentiates the Effect of Isolated Lung Perfusion With Doxorubicin

Jeffrey L. Port, MD, Steven N. Hochwald, MD, Hong-Yue Wang, MD, Michael E. Burt, MD, PhD

The Thoracic Oncology/Surgical Metabolism Laboratory, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York

Background. Although surgical resection remains the mainstay of treatment for metastatic pulmonary sarcoma, 5-year survival approaches only 25%. Chemotherapy has been limited by tumor resistance and systemic toxicity. We assessed the efficacy of L-buthionine-SR-sulfoximine, an inhibitor of glutathione synthesis, as a sensitizer for isolated lung perfusion.

Methods. In experiment 1, sarcoma-bearing rats (n = 20) received either buthionine sulfoximine via intraperitoneal injection or Hespan. After the last injection, tumor glutathione levels were measured. In experiment 2, rats (n = 60) were injected with sarcoma intravenously. On day 6, animals were pretreated with either buthionine sulfoximine or Hespan intraperitoneally. On day 7, rats underwent isolated lung perfusion (Hespan or doxorubi-cin) or intravenous therapy (Hespan or doxorubicin). On day 14, tumor nodules were counted.

Results. Buthionine sulfoximine effectively depleted tumor glutathione. Animals treated with intravenous therapy had no response to therapy, whereas those animals treated with doxorubicin isolated lung perfusion alone had a limited response. Buthionine-sulfoximine pretreatment in combination with doxorubicin isolated lung perfusion led to a 13-fold reduction in tumor nodules and 5 complete responses.

Conclusions. Buthionine-sulfoximine pretreatment in combination with doxorubicin isolated lung perfusion is superior to intravenous doxorubicin and doxorubicin isolated lung perfusion alone for the treatment of metastatic pulmonary sarcoma.


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Discussion
Ann. Thorac. Surg. 1995 60: 244. [Extract] [Full Text]



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