AUTHOR=Fu Jixin , Kong Qingbin , Sui Xin , Wang Xinjian TITLE=Multiple sarcomatoid carcinoma of the small intestine with perforation as the initial symptom: case report and review of the literature JOURNAL=Frontiers in Oncology VOLUME=14 YEAR=2024 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2024.1477951 DOI=10.3389/fonc.2024.1477951 ISSN=2234-943X