TESMIN (testis expressed metallothionein-like protein) is a cysteine-rich, 60 kDa metallothionein-like protein primarily characterized by its role in male germ cell development. Functionally, TESMIN is essential for spermatogenesis and serves as an early marker of male germ cell differentiation, with expression specifically localized to spermatocytes during meiosis 1. The protein contains metallothionein-like motifs with metal ion binding capacity and acts as a ligand-selective coactivator of the mineralocorticoid receptor, exhibiting aldosterone-specific interactions through LxxLL motifs 23. Beyond its reproductive function, TESMIN has emerged as a significant oncogenic factor across multiple cancer types. In lung adenocarcinoma, TESMIN promotes proliferation, migration, and invasion via PI3K/AKT/mTOR pathway activation and associates with poor overall survival 45. Similarly, in hepatocellular carcinoma, elevated TESMIN expression correlates with advanced tumor stage, invasion, and poor prognosis, with functional studies demonstrating its role in promoting HCC cell proliferation and invasiveness 6. In early gastric cancer, TESMIN represents a component of a predictive biomarker panel for lymph node metastasis assessment 7. Non-small cell lung cancer demonstrates significantly elevated TESMIN expression correlating with Ki-67 proliferation markers and reduced survival 8. These findings position TESMIN as both a prognostic biomarker and potential therapeutic target across malignancies.