Bladder cancer risk in painters: a meta-analysis.

Area of Science:

• Occupational Health
• Epidemiology
• Cancer Research

Background:

• International Agency for Research on Cancer classifies painter exposure as carcinogenic.
• Elevated risks of bladder and lung cancer are noted in painters.
• Previous studies suggest a link between painter occupations and cancer, but confounding factors require further investigation.

Purpose of the Study:

• To quantitatively assess the risk of bladder cancer in painters through a comprehensive meta-analysis.
• To evaluate the impact of smoking and other occupational exposures as potential confounders.
• To determine if the risk of bladder cancer increases with the duration of employment as a painter.

Main Methods:

• A meta-analysis was conducted on 41 studies (cohort, record linkage, case-control) involving over 2900 bladder cancer cases or deaths in painters.
• Risk estimates were analyzed overall, adjusted for smoking, and adjusted for other occupational exposures.
• Stratified analyses were performed by study design, gender, and study location. Publication bias was assessed.

Main Results:

• The overall summary relative risk (meta-RR) for bladder cancer in painters was 1.25 (95% CI 1.16 to 1.34).
• Smoking-adjusted risk estimates showed a meta-RR of 1.28 (95% CI 1.15 to 1.43).
• Exposure-response analyses indicated an increased risk with longer duration of employment, and no publication bias was found.

Conclusions:

• Occupational exposures in painters are causally associated with an increased risk of bladder cancer.
• The findings remain robust across different study designs and after adjusting for key confounders.
• This study supports the classification of painter occupations as a risk factor for human bladder cancer.