PTPRJ (Protein Tyrosine Phosphatase, Receptor Type J): PTPRJ is a member of the protein tyrosine phosphatase (PTP) family, enzymes that regulate cellular processes by dephosphorylating tyrosine residues on proteins. PTPRJ negatively regulates cell proliferation and is involved in cell signaling pathways that control cell growth and differentiation. It acts as a tumor suppressor in several types of cancers by inhibiting pathways that lead to uncontrolled cell growth. Loss of PTPRJ function has been linked to enhanced tumor growth and progression, emphasizing its role in cancer biology....