Different tumor types express variable numbers of the known 28 types of collagens, which depending on their interactions with membrane receptors such as integrins, glycoprotein VI, and receptor tyrosine kinases (e.g., discoidin domain receptors 1 and 2, DDR1/DDR2) induce signaling cascades that enhance tumor progression, metastasis formation, and chemoresistance (reviewed in [8]). Here, NTRK1 is linked to neoplasm.