Phase II Study of Belinostat in Patients With Recurrent or Refractory Advanced Thymic Epithelial Tumors.

Giaccone, G., Rajan, A., Berman, A., Kelly, R.J., Szabo, E., Lopez-Chavez, A., Trepel, J., Lee, M.J., Cao, L., Espinoza-Delgado, I., Spittler, J., Loehrer, P.J. Sr.
Journal   J Clin Oncol.
Species  
Analytes Measured   PlGF , Flt-1 VEGFR1
Matrix Tested   Plasma
Year   2011
Volume   29
Page Numbers   2052-9
Application   Cytokines and Chemokines
Abstract
PURPOSE: Thymic epithelial tumors are rare malignancies, and there is no standard treatment for patients with advanced disease in whom chemotherapy has failed. Antitumor activity of histone deacetylase (HDAC) inhibitors in this disease has been documented, including one patient with thymoma treated with the pan-HDAC inhibitor belinostat. PATIENTS AND

METHODS: Patients with advanced thymic epithelial malignancies in whom at least one line of platinum-containing chemotherapy had failed were eligible for this study. Other eligibility criteria included adequate organ function and good performance status. Belinostat was administered intravenously at 1 g/m(2) on days 1 to 5 of a 21-day cycle until disease progression or development of intolerance. The primary objective was response rate in patients with thymoma.

RESULTS: Of the 41 patients enrolled, 25 had thymoma, and 16 had thymic carcinoma; patients had a median of two previous systemic regimens (range, one to 10 regimens). Treatment was well tolerated, with nausea, vomiting, and fatigue being the most frequent adverse effects. Two patients achieved partial response (both had thymoma; response rate, 8%; 95% CI, 2.2% to 25%), 25 had stable disease, and 13 had progressive disease; there were no responses among patients with thymic carcinoma. Median times to progression and survival were 5.8 and 19.1 months, respectively. Survival of patients with thymoma was significantly longer than that of patients with thymic carcinoma (median not reached v 12.4 months; P = .001). Protein acetylation, regulatory T-cell numbers, and circulating angiogenic factors did not predict outcome.

CONCLUSION: Belinostat has modest antitumor activity in this group of heavily pretreated thymic malignancies. However, the duration of response and disease stabilization is intriguing, and additional testing of belinostat in this disease is warranted.

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