NTRK1 and neoplasm: Several studies have reported that CD44s modulates cellular signalling by interacting with various receptor tyrosine kinases, and it induces epithelial‐to‐mesenchymal transition and stem‐like properties in tumour cells (Brown et al., 2011; Mima et al., 2012; Ponta et al., 2003; Zöller, 2011).