KRT19 and breast carcinoma: Besides keratin 19, recently described as CTC marker for breast cancer and other epithelial malignancies (Alix‐Panabieres & Pantel, 2014a), viable CTC‐ITB‐01 cells actively secreted vascular endothelial growth factor (VEGF) known to induce tumor angiogenesis in patients with cancer (Saharinen et al, 2011) (Appendix Fig S2).