Emerging evidence suggests some bacterial infections may be early signs of hidden cancers rather than random events. Yet this link remains under-recognized in practice, representing an often-missed diagnostic opportunity. Large registry studies show that certain infections are linked to a sharply increased short-term risk of cancer detection, with most of the excess diagnoses clustering in the first 6 months after the index episode. Key associations include the following: (i) anaerobic or gut-derived bacteremia withBacteroides,Clostridium,Fusobacterium, or pks+Escherichia colibefore colorectal neoplasm; (ii)Streptococcus gallolyticus/bovisbacteremia and colorectal neoplasm; (iii) cryptogenicKlebsiella pneumoniaeliver abscess and pancreaticobiliary or colorectal cancer; (iv) non-resolving pneumonia and segmental collapse before lung cancer. Overall, short-term cancer detection risks range from about 3% after unselected Gram-negative bacteremia to ~8% or higher after cryptogenic liver abscess—similar to accepted thresholds that justify targeted cancer work-up. Even hidden tumors disrupt immunity, compromise barriers, and create conditions that favor microbial invasion. This review synthesizes evidence for the “sentinel infection phenotype”; outlines pathogen-specific associations, including their possible pathogenetic mechanisms; and proposes a practical diagnostic framework. Recognizing these infection signatures may enable earlier cancer detection and better outcomes.
新近证据表明，某些细菌感染可能是潜在癌症的早期征兆，而非随机事件。然而，这种关联在临床实践中仍未得到充分认识，往往错失了诊断良机。大型登记研究显示，特定感染与短期内癌症检出风险急剧升高相关，其中绝大多数超额诊断集中在感染事件发生后的前6个月内。主要关联包括：（一）厌氧菌或肠道来源的菌血症（如拟杆菌属、梭菌属、梭杆菌属或pks+大肠杆菌）与结直肠肿瘤的关联；（二）牛链球菌/解没食子酸链球菌菌血症与结直肠肿瘤的关联；（三）隐源性肺炎克雷伯菌肝脓肿与胰胆管癌或结直肠癌的关联；（四）迁延性肺炎及肺段不张与肺癌的关联。总体而言，短期癌症检出风险范围从未经筛选的革兰氏阴性菌血症后的约3%到隐源性肝脓肿后的约8%或更高——这与当前公认需启动针对性癌症检查的阈值相当。即使是隐匿性肿瘤也会破坏免疫功能、损害屏障完整性，并创造有利于微生物入侵的条件。本综述整合了“哨兵感染表型”的证据，概述了病原体特异性关联及其可能的致病机制，并提出实用的诊断框架。识别这些感染特征可能有助于实现更早的癌症检测和更好的临床结局。
The Infectious Clue: Linking Bacterial Infections to Underlying Malignancies
肿瘤(癌症)患者之家