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Πέμπτη 13 Ιουλίου 2017

Results from a Phase I/II Open-Label, Dose-Finding Study of Pralatrexate and Oral Bexarotene in Patients with Relapsed/Refractory Cutaneous T-cell Lymphoma

Purpose: Pralatrexate is a folic acid analogue metabolic inhibitor similar to methotrexate, which has shown tolerability and efficacy with an overall response rate of 45% in a phase I dose deescalation study of patients with relapsed/refractory cutaneous T-cell lymphoma (CTCL).

Experimental Design: The object of this phase I/II open-label, multicenter clinical trial was to determine the MTD and recommended dose of pralatrexate plus oral bexarotene in 34 patients with relapsed/refractory CTCL who had failed prior systemic therapies. Pralatrexate was administered by intravenous push at 15 mg/m2 given weekly 3 weeks out of 4 weeks with daily oral bexarotene (150 or 300 mg/m2), levothyroxine, atorvastatin, folate, and with B12 every 2 months.

Results: At the MTD of 15 mg/m2 bexarotene and 15 mg/m2 pralatrexate, the response rate was 60% [4 complete responses (CR), 14 partial responses (PR)], the maximum observed response duration was 28.9+ months, and duration of response for 4 CRs ranged from 9.0 to 28.3 months. The median progression-free survival was 12.8 months (0.5–29.9). Mucositis was the most common adverse event.

Conclusions: The combination of pralatrexate (15 mg/m2) and oral bexarotene (150 mg/m2) is active with high response rates and minimal toxicity for cutaneous T-cell lymphomas. Clin Cancer Res; 23(14); 3552–6. ©2017 AACR.



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