Response to comment by Erren and Morfeld on our paper 'Night work and breast cancer risk in a cohort of female healthcare employees in Stockholm, Sweden

In response to our paper, Erren and Morfeld argue that chronotype is an overseen and underestimated modifier of the risk for breast cancer in association with night work. This hypothesis was presented in 20131 and has been repeated several times since then. However, Erren and Morfeld present little or no evidence to support the hypothesis by empirical data. The references in their letter repeat the theory rather than to test it. We do not see the relevance of citing a paper saying that it is important to include data on smoking in studies of lung cancer (ref 6 in their letter). We appreciate that Erren actually has contributed to test the hypothesis in a study on an Australian data set investigating night work and breast cancer, although this was not mentioned in their letter. The study concluded that there was virtually no difference in results by including...
Source: Occupational and Environmental Medicine - Category: Occupational Health Authors: Tags: PostScript Source Type: research