Exploring the multifaceted challenges of gastrointestinal metastases in lung adenocarcinoma: a case report highlighting diagnostic dilemmas and therapeutic innovations - Xu, Xinxin; Zhou, Qian; Chen, Peng; Du, Chengzhou; Huang, Yonghua; Gao, Xiaoxin; Xu, Shumei; Wu, Jinling; He, Tianxiao; Li, Hongtao (Frontiers in Oncology, 2024)