Except that melatonin production which is tied to our circadian rhythms, which are influenced by light is related to breast cancer. They had some correlative evidence of this before, now they have some real experimental evidece. It is not definitive evidence though, and requires more study.
First, it could spawn trials that test whether malignancies can be slowed down by altering a person's light environment or by using melatonin supplements. Second, he says, similar studies could show whether exposure to nocturnal light poses a prostate cancer risk to men, as some researchers suspect, or promotes other cancers previously linked to light at night (SN: 8/28/04, p. 141: Available to subscribers at
http://www.sciencenews.org/articles/20040828/note11.asp).
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