PRRX1 and neoplasm: Subcutaneous xenograft model using PRRX1-overexpressing and vector control Cal-27 cells in nude mice to assess tumor growth suppression and dormancy; tumor volume measurement over 6 weeks; H&E and immunohistochemistry for PRRX1, TGF-β2, p38, and E-cadherin expression; Western blot and RT-PCR analyses to evaluate EMT- and dormancy-related markers (E-cadherin, TGF-β2, p38, and miR-642b-3p).