Sildenafil Induces Cell Cycle Arrest and Apoptosis in Human Colorectal Cancer HT-29 Cells. Journal of Cancer Research Updates, [S. l.], v. 7, n. 2, p. 59–63, 2021. DOI: 10.6000/1929-2279.2018.07.02.4. Disponível em: https://neoplasiaresearch.com/index.php/jcru/article/view/623. Acesso em: 20 oct. 2025.