Oncology Medical News about cigarette smoking; liver cancer

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Meta-analysis of epidemiologic studies on cigarette smoking and liver cancer
International Journal of Epidemiology, 09/02/09

Lee Y–CA et al. – The results of this meta–analysis show that tobacco smoking is associated with liver cancer development, which supports the conclusion by the IARC Monograph. This conclusion has an important public health message for areas with high smoking prevalence and high liver cancer incidence such as China.

Methods

The authors identified 38 cohort studies and 58 case–control studies in a systematic literature search for studies on liver cancer and cigarette smoking.
The meta–relative risk (mRR) of liver cancer and dose–response trends were calculated.
Tests for heterogeneity, publication bias assessment and influence analyses were performed.

Results

Compared with never smokers, the adjusted mRR was 1.51 for current smokers and 1.12 for former smokers.
The increased liver cancer risk among current smokers appeared to be consistent in strata of different regions, study designs, study sample sizes and publication periods.

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