PTK2 and neoplasm: Many studies have shown that typical cell adhesion markers such as E‐cadherin, N‐cadherin, β‐catenin, and cell‐extracellular matrix adhesion markers such as integrins, focal adhesion kinase (FAK), and Non‐Receptor Tyrosine Kinase (SRC) protein, have a significant impact on the characteristics and behavior of various tumor cells.12, 13