LCP2 and synovial sarcoma: Lymphocyte cytosolic protein 2 is an adapter protein-encoding gene necessary for the normal development of T cells and activation of serine phosphorylation and participates in the protein tyrosine kinase pathway activated by the TCR.[33,34] Although there are no LCP2-related studies in HT and SS, studies in other medical fields detail the function of LCP2 in immune cells.