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   A K Koutras et al, 2014, The Pharmacogenomics Journal CrossRef
2. The clinical relevance of serum vascular endothelial growth factor (VEGF) in correlation to circulating tumor cells and other serum biomarkers in patients with metastatic breast cancer
   Malgorzata Banys-Paluchowski et al, 2018, Breast Cancer Research and Treatment CrossRef