CLPTM1 (Cleft Lip and Palate Transmembrane Protein 1): CLPTM1 is a transmembrane protein involved in essential cellular processes such as cell proliferation, apoptosis, and carcinogenesis. Although its precise function is not yet fully understood, research suggests it plays a role in cancer development and progression. CLPTM1 expression has been associated with several cancers, including lung, pancreatic, and ovarian cancers, where it may promote tumor growth and metastasis. It is also linked to smoking-related cancers due to its interaction with tobacco-associated carcinogens. Understanding the molecular mechanisms of CLPTM1 could provide valuable insights into cancer biology and potential therapeutic strategies.