Motesanib diphosphate in progressive differentiated thyroid cancer.

New England Journal of Medicine (Impact Factor: 54.42). 01/2009; 359(25):2727; author reply 2727.
Source: PubMed

ABSTRACT Background The expression of vascular endothelial growth factor (VEGF) is characteristic of differentiated thyroid cancer and is associated with aggressive tumor behavior and a poor clinical outcome. Motesanib diphosphate (AMG 706) is a novel oral inhibitor of VEGF receptors, platelet-derived growth-factor receptor, and KIT. Methods In an open-label, single-group, phase 2 study, we treated 93 patients who had pro- gressive, locally advanced or metastatic, radioiodine-resistant differentiated thyroid cancer with 125 mg of motesanib diphosphate, administered orally once daily. The primary end point was an objective response as assessed by an independent radio- graphic review. Additional end points included the duration of the response, pro- gression-free survival, safety, and changes in serum thyroglobulin concentration. Results Of the 93 patients, 57 (61%) had papillary thyroid carcinoma. The objective re- sponse rate was 14%. Stable disease was achieved in 67% of the patients, and stable disease was maintained for 24 weeks or longer in 35%; 8% had progressive disease as the best response. The Kaplan-Meier estimate of the median duration of the response was 32 weeks (the lower limit of the 95% confidence interval (CI) was 24; the upper limit could not be estimated because of an insufficient number of events); the estimate of median progression-free survival was 40 weeks (95% CI, 32 to 50). Among the 75 patients in whom thyroglobulin analysis was performed, 81% had decreased serum thyroglobulin concentrations during treatment, as compared with baseline levels. The most common treatment-related adverse events were diarrhea (in 59% of the patients), hypertension (56%), fatigue (46%), and weight loss (40%). Conclusions Motesanib diphosphate can induce partial responses in patients with advanced or metastatic differentiated thyroid cancer that is progressive. ( number, NCT00121628.)

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