Zhong, Chenhan, Xuefeng Fang, Lizhen Zhu, Dan Li, Jinlong Tang, and Ying Yuan. “Report of Two Cases and a Systematic Review of Breast Cancer With Gastrointestinal Metastasis”. Turkish Journal of Gastroenterology 30, no. 11 (January 11, 2019): 997–1000. Accessed January 1, 2026. https://www.turkjgastroenterol.org/index.php/tjg/article/view/3519.