Alcoholic beverages, obesity, physical activity and other nutritional factors, and cancer risk: A review of the evidence.

Purpose: Prevention is a priority in the fight against cancers, especially nutritional prevention. To update the levels of evidence of relationships between 10 nutritional factors and cancer risk, the scientific literature published from 2006 to 2014 was reviewed by an expert group.

Methods: Data from 133 meta-analyses, pooled analyses or intervention trials were examined.

Excess body weight and second primary cancer risk after breast cancer: a systematic review and meta-analysis of prospective studies.

Several observational studies have investigated the role of body mass index (BMI) in second primary cancer incidence in women with breast cancer. We conducted a systematic review and meta-analysis of the evidence to assess the strength of this association. PubMed and Embase were searched for observational studies up to May 2012, and the reference lists of studies included in the analysis were examined.

Maternal alcohol consumption during pregnancy and risk of childhood leukemia: systematic review and meta-analysis.

Background: Leukemia is the most frequently occurring cancer in children. Although its etiology is largely unknown, leukemia is believed to result from an interaction between genetic and environmental factors. Among different potential risk factors, the possible role of maternal alcohol consumption during pregnancy has been questioned.

Beta-carotene supplementation and cancer risk: a systematic review and metaanalysis of randomized controlled trials.

The effect of beta-carotene supplementation on cancer incidence has been investigated in several randomized controlled trials. The objective was to review the effect of beta-carotene supplementation on cancer incidence in randomized trials by cancer site, beta-carotene supplementation characteristics and study population. Relevant trials were retrieved by searching PubMed (up to April 2009).