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Published in: Cancer Chemotherapy and Pharmacology 2/2014

01-08-2014 | Original Article

Hypothyroidism as a potential biomarker of efficacy of famitinib, a novel VEGFR-2 inhibitor in metastatic breast cancer

Authors: Jun Cao, Jian Zhang, Zhonghua Wang, Biyun Wang, Fangfang Lv, Leiping Wang, Xichun Hu

Published in: Cancer Chemotherapy and Pharmacology | Issue 2/2014

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Abstract

Purpose

Hypothyroidism is a common adverse event in patients treated with anti-VEGFR-2 targeting agents and may be a valuable predictive factor of efficacy. Famitinib is an inhibitor of multiple tyrosine kinases mainly targeting VEGFR-2. The objectives of this study were to assess the efficacy and safety of famitinib in patients with pretreated HER2-negative metastatic breast cancer (MBC) and to explore potential of famitinib-induced hypothyroidism and serum vascular endothelial growth factor (VEGF) level for efficacy prediction.

Materials and methods

The primary end point was objective response rate (ORR). Famitinib was administered 25 mg/d. Thyroid function assessments were done at baseline and then every 4 weeks. Plasma levels of VEGF were determined at baseline and 2 cycles after treatment.

Results

A total of 28 patients were enrolled. ORR was 14.3 %. The most common grade 3/4 AEs were hand–foot syndrome (25.0 %), proteinuria (21.4 %) and hypertension (17.9 %). 64.0 % patients were observed with elevated thyroid-stimulating hormone (TSH) (>4.94 mIU/L) at any time during the entire treatment period. Sixteen patients with an elevated TSH had a significantly longer PFS than nine patients with no TSH elevation (107 vs. 53 days, respectively, P = 0.002). TSH elevation was also an independent predictor of PFS in a Cox regression model. Plasma VEGF levels did not correlate significantly with clinical outcomes.

Conclusions

Famitinib did show substantial anti-tumor activities with a good safety profile in heavily pretreated patients with HER2-negative MBC. Famitinib-related TSH increase may be an early indicator of its efficacy. Serial monitoring of serum TSH may help define VEGFR-2-dependent or VEGFR-2-independent drug resistance.
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Metadata
Title
Hypothyroidism as a potential biomarker of efficacy of famitinib, a novel VEGFR-2 inhibitor in metastatic breast cancer
Authors
Jun Cao
Jian Zhang
Zhonghua Wang
Biyun Wang
Fangfang Lv
Leiping Wang
Xichun Hu
Publication date
01-08-2014
Publisher
Springer Berlin Heidelberg
Published in
Cancer Chemotherapy and Pharmacology / Issue 2/2014
Print ISSN: 0344-5704
Electronic ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-014-2505-x

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