Comprehensive workplace intervention for cancer prevention in China (WECAN): protocol for a stepped-wedge, cluster-randomised controlled trial.

5 6 In the USA, the Working Well Trial funded by the National Cancer Institute in 1989 indicated that the 2-year intervention in workplace for cancer prevention resulted in a significant improvement in diet and a positive trend in tobacco control. 7 A non-governmental organisation named ‘The CEO Roundtable on Cancer’ was reported to have helped hundreds of companies to establish healthy workplace for cancer prevention and control. 8 The American Centre for Disease Control and Prevention (US CDC) has developed a workplace

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