“Correlations Between Carcinoembryonic Antigen, Epidermal Growth Factor and Leptin in Patients With Non-Small-Cell Lung Cancer”. Journal of Analytical Oncology 3, no. 1 (January 15, 2014):  11–17. Accessed April 18, 2026. https://neoplasiaresearch.com/index.php/jao/article/view/207.