时间标签：数据日期 2026-11-05 · 生成时间 2026-11-05 05:30（Asia/Shanghai）｜ 检索窗口 PubMed edat 2026/11/02 – 2026/11/06 ｜ 情报发生日期 2026-11-05
研究问题
Second, the cross-sectional design of most case-control studies precludes determining whether elevated cadmium levels precede or result from malignant transformation—a limitation that prospective cohort studies with pre-diagnostic biospecimens could potentially address (Zhang L. et al., 2023).；Cross-sectional data alone cannot determine whether BMI directly modifies lead toxicity or whether unmeasured factors associated with both BMI and lead exposure drive the observed interaction.；The main uncertainty is whether cadmium’s effect is independent of smoking or partially mediated by it.
方法
Epidemiological and analytical studies have consistently reported significantly higher concentrations of these metals in the serum, urine, or tumor tissues of patients with bladder cancer than in healthy controls or adjacent non-cancerous tissues (Panaiyadiyan et al., 2023; Golabek et al., 2017; Chung et al., 2017; El-Agrody et al., 2024).；Some high-quality prospective studies, such as the European EPIC Florence cohort, have reported no significant association between pre-diagnostic serum levels of multiple metals and bladder cancer risk among never and long former smokers without occupational exposure (Caini et al., 2025).；Specifically, we critically evaluate the epidemiological associations between exposure to cadmium, chromium, lead, and arsenic and bladder cancer risk, with particular attention to study heterogeneity, dose-response relationships, and the confounding role of smoking.
核心结论
Third, the dose-response relationship remains poorly quantified, and formal meta-analyses have not established a clear threshold or linear gradient specific to bladder cancer (Fanfani et al., 2024).Collectively, evidence on cadmium remains consistent across tissue, blood, and urine matrices, supporting a positive association with bladder cancer.；Arsenic demonstrates the most robust dose-response relationship, supported by both ecological and case-control studies.；Evidence for the mediation hypothesis is growing: a recent NHANES-based mediation analysis demonstrated that blood cadmium accumulation significantly mediates the association between smoking and all-cause and cancer-related mortality (Kim et al., 2023).
局限
However, the epidemiological landscape remains controversial.；These apparent discrepancies likely reflect fundamental differences in study design, exposure assessment matrices, and the temporal windows captured by different biological specimens—challenges that warrant critical evaluation.From a mechanistic standpoint, the International Agency for Research on Cancer (IARC) has classified several toxic metals as definite or probable human carcinogens (Parida and Patel, 2023).；However, causal factors vary even within high-risk occupations.
对本项目的价值
中高价值：属「线粒体质量控制与氧化应激」方向；线粒体功能与氧化应激栏目可用作本项目文献库与综述素材。 ｜ 价值分 3.4/5（★★★☆☆）
全文来源
PubMed PMC JATS（正文 96,678 字符，题名指纹 0.95，已过 PubMed PMCID 官方关联 + 题名指纹 + 正文长度归属校验）
原文题录
- 中文题名：从流行病学到分子病理：毒性金属暴露在膀胱癌发生进展中的作用现状与展望
- 英文标题：From epidemiology to molecular pathology: current research status and future prospects on the role of toxic metal exposure in the development and progression of bladder cancer.
- 期刊与标识：Frontiers in cell and developmental biology · PMID 42978876 · DOI 10.3389/fcell.2026.1930640 · PMC PMC13728351