未治疗，预后较差，中位生存期为 3-4 个月。
原发部位不明腺癌 (adenocarcinoma of unknown primary, sitAUP) 是原发部位不明癌症 (cancer of unknown primary site, CUP) 的常见临床疾病的主要亚组。它被定义为转移性腺癌，其原发部位在诊断时检测不到，无论是通过体格检查、实验室检查还是放射影像学检查。
Division of Medical Oncology
Johns Hopkins University School of Medicine
RCD declares that he has no competing interests.
Dr Ross C. Donehower would like to gratefully acknowledge Dr David Cosgrove and Dr Hatim Hussain, previous contributors to this monograph. DC and HH declare that they have no competing interests.
Department of Medicine
Roswell Park Cancer Institute
NK declares that he has no competing interests.
Children's Hospital of Philadelphia
ZT declares that he has no competing interests.
Consultant Medical Oncologist/Senior Lecturer
Department of Medical Oncology
Imperial College/Imperial Healthcare NHS Trust
Charing Cross Hospital
JS declares that he has no competing interests.