CLPTM1 (Cleft Lip and Palate Transmembrane Protein 1): CLPTM1 is a transmembrane protein involved in crucial cellular processes such as cell proliferation, apoptosis, and carcinogenesis. Although its exact function is not yet fully defined, research suggests its potential role in cancer development and progression. CLPTM1 expression has been linked to various cancers, including lung, pancreatic, and ovarian cancers, where it may contribute to tumour 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 provide valuable insights into cancer biology and therapeutic strategies.