Changes in hormone receptor when breast cancer metastasizes to the colon: case report and literature review - Li, Huimeng; Yang, Liying; Sun, Xiqiang; Wang, Zhuquan; Qin, Shuangwei; Li, Chengcheng; Liu, Gongwu; Xie, Fengming; Gao, Weiwei (Frontiers in Oncology, 2025)