FLT1 and cancer: Although some are case specific, among the receptors detected were those associated with cancer signaling pathways, including epidermal growth factor receptor (EGFR), transforming growth factor beta receptor type II and III, hepatocyte growth factor receptor (HGFR), vascular endothelial growth factor receptor (VEGFR1), mast/stem cell growth factor receptor (KIT), and receptor tyrosine‐protein kinase Erbb‐3 (Fig. 2D).