CLPTM1 (Cleft Lip and Palate Transmembrane Protein 1): CLPTM1 is a transmembrane protein involved in key cellular processes such as cell proliferation, apoptosis, and carcinogenesis. While its exact function remains not fully defined, research indicates its potential role in cancer development and progression. CLPTM1 expression has been linked to multiple cancers, including lung, pancreatic, and ovarian cancers, where it may contribute to tumor growth and metastasis. It is also associated with smoking-related cancers due to its interaction with tobacco-related carcinogens. Understanding CLPTM1’s molecular mechanisms could offer valuable insights into cancer biology and therapeutic strategies.