Abstract
The efficacy of anti-VEGF agents probably lies on VEGF-dependency. Apatinib, a specific tyrosine kinase inhibitor that targets VEGF receptor 2, was assessed in patients with advanced breast cancer (ABC) (ClinicalTrials.gov NCT01176669 and NCT01653561). This substudy was to explore the potential biomarkers for VEGF-dependency in apatinib-treated breast cancer. Eighty pretreated patients received apatinib 750 or 500 mg/day orally in 4-week cycles. Circulating biomarkers were measured using a multiplex assay, and tissue biomarkers were identified with immunostaining. Baseline characteristics and adverse events (AEs) were included in the analysis. Statistical confirmation of independent predictive factors for anti-tumor efficacy was performed using Cox and Logistic regression models. Median progression-free survival (PFS) was 3.8 months, and overall survival (OS) was 10.6 months, with 17.5 % of objective response rate. Prominent AEs (≥60 %) were hypertension, hand-foot skin reaction (HFSR), and proteinuria. Higher tumor phosphorylated VEGFR2 (p-VEGFR2) expressions (P = 0.001), higher baseline serum soluble VEGFR2 (P = 0.031), hypertension (P = 0.011), and HFSR (P = 0.018) were significantly related to longer PFS, whereas hypertension (P = 0.002) and HFSR (P = 0.001) were also related to OS. Based on multivariate analysis, only p-VEGFR2 (adjusted HR, 0.40; P = 0.013) and hypertension (adjusted HR, 0.58; P = 0.038) were independent predictive factors for both PFS and clinical benefit rate. Apatinib had substantial antitumor activity in ABC and manageable toxicity. p-VEGFR2 and hypertension may be surrogate predictors of VEGF-dependency of breast cancer, which may identify an anti-angiogenesis sensitive population.
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Abbreviations
- PFS:
-
Progression-free survival
- OS:
-
Overall survival
- ORR:
-
Objective response rate
- DCR:
-
Disease control rate
- CBR:
-
Clinical benefit rate
- AEs:
-
Adverse events
- HFSR:
-
Hand–foot skin reaction
- VEGFR2:
-
Vascular endothelia growth factor receptor 2
- p-VEGFR2:
-
Phosphorylated VEGFR2
- TKI:
-
Tyrosine kinase inhibitors
- ABC:
-
Advanced breast cancer
- RECIST:
-
Response evaluation criteria for solid tumors
- CTCAE:
-
Common terminology criteria for AEs
- ECOG:
-
Eastern Cooperative Oncology Group
- TNBC:
-
Triple-negative breast cancer
- IHC:
-
Immunohistochemistry
- IOD:
-
Integrated optical density
- AOD:
-
Average optical density
- ROC:
-
Receiver operator characteristic
- ER:
-
Estrogen receptor
- PR:
-
Progesterone receptor
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Acknowledgments
The authors thank the patients, investigators, and participating institutions. We thank the pathologist Hongyu Gu for tissue biomarker analysis advice; Xiaofeng Xu for enzyme-linked immunosorbent assay; Menghong Sun, Ph.D. and Xueke Zhou for sample preservation; Zhiyu Chen, M.D. and Ka Jia for statistical advice; Zhe Zhang, M.D., for quantitative software operation; and Xiaoyu Chen, Chunmei Liao for operational support. We also thank the sponsor, Jiangsu Hengrui Medicine Co., Ltd., for providing apatinib free of charge. The financial support was provided by Science and Technology Commission of Shanghai Municipality (grant number: 114119b1800).
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical standards
This study was performed in accordance with the International Conference on Harmonization Good Clinical Practice guidelines, the Declaration of Helsinki (1996 version), and applicable local regulatory requirements and laws. The study was approved by Fudan University Shanghai Cancer Center Ethic Committee for Clinical Investigation.
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Minhao Fan and Jian Zhang contributed equally to this manuscript.
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10549_2013_2793_MOESM2_ESM.eps
Supplementary Fig. 1 Kaplan–Meier curves for PFS: baseline serum sVEGFR2 (a), p-VEGFR2 (b), menstruation status (c), lines of prior chemotherapy (d), hypertension (e), and HFSR (f) (EPS 402 kb)
10549_2013_2793_MOESM3_ESM.eps
Supplementary Fig. 2 Kaplan–Meier curves for OS: p-VEGFR2 (a), number of metastatic sites (b), hypertension (c), and HFSR (d) (EPS 382 kb)
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Fan, M., Zhang, J., Wang, Z. et al. Phosphorylated VEGFR2 and hypertension: potential biomarkers to indicate VEGF-dependency of advanced breast cancer in anti-angiogenic therapy. Breast Cancer Res Treat 143, 141–151 (2014). https://doi.org/10.1007/s10549-013-2793-6
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DOI: https://doi.org/10.1007/s10549-013-2793-6