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Original Articles: General Thoracic

A Phase II Trial of Tetrathiomolybdate After Surgery for Malignant Mesothelioma: Final Results

^a Department of Cardiothoracic Surgery, New York University School of Medicine, New York, New York
^b Departments of Medicine and Human Genetics, University of Michigan, Ann Arbor, Michigan
^c University of Hawaii Cancer Center, Honolulu, Hawaii

Accepted for publication March 5, 2008.

^_* Address correspondence to Dr Pass, Department of Cardiothoracic Surgery, New York University School of Medicine, 530 First Ave, 9V, New York, NY 10016 (Email: harvey.pass{at}med.nyu.edu).

Presented at the Forty-fourth Annual Meeting of The Society of Thoracic Surgeons, Ft Lauderdale, FL, Jan 28–30, 2008.

Background: Tetrathiomolybdate (TM) is an oral copper-depleting agent that has been shown to inhibit angiogenesis, and angiogenesis is a predictor of poor prognosis in malignant pleural mesothelioma. We hypothesized that cytoreduction of malignant pleural mesothelioma followed by TM will delay time to progression.

Methods: Between November 2000 and August 2003, 30 patients with malignant pleural mesothelioma received postoperative TM beginning 4 to 6 weeks after surgery at a dose adjusted to keep ceruloplasmin between 5 and 15 mg/dL). Time to progression was compared with the 55 stage I and II patients and 109 stage III patients previously treated with cytoreduction by one of us (H.P.).

Results: The 30 patients (25 men, 5 women; 13 stage I and II, 17 stage III), median age 67 years (range, 49–81 years), remained on TM a median of 14.9 months (range, 2 to 57 months). All patients reached target ceruloplasmin levels at a mean of 34 ± 2 days (95% confidence interval, 30 to 39 days), and vascular endothelial growth factor levels at baseline (ceruloplasmin = 45.2 ± 2 mg/dL) decreased from 2,086 ± 390 pg/mL to 1,250 ± 712 pg/mL (p < 0.002) at target ceruloplasmin (13 ± 2 mg/dL; p < 0.0001 from baseline). The time to progression for all stage I or II TM patients was 20 months whereas that of 55 stage I or II non–TM-treated patients was 10 months (p = 0.046 versus TM). No differences in time to progression for the stage III TM patents from surgery were seen (7 months).

Conclusions: Tetrathiomolybdate has antiangiogenic effects in malignant pleural mesothelioma patients after resection of gross disease, and exhibits minimal toxicity and comparable efficacy to previous multimodality trials. Tetrathiomolybdate should be evaluated for efficacy in combination with standard malignant pleural mesothelioma regimens, as well as for postsurgical maintenance therapy.