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Although this appears to be an interesting co-relation, the authors
have not considered the relation of smoking in these women.It was found
that smoking may be related with a lower risk of breast cancer in women
with BRCA1&2 mutations(J Natl Cancer Inst. 1998 May 20;90(10):761-
6.).Hence if these women have been smokers then it reduces there lifetime
risk of developing breast cancer.
Secondly there has been a study which
has showed that weight loss in early adulthood (18-30 years)decreases the
risk of breast cancer in women with BRCA 1 carriers (Breast Cancer
Research 2005,7:R833-R843).Also there is ongoing research with regards to
the factors that might be causing the BRCA1 and 2 gene mutations.Therefore
I do not think there is enough evidence that makes the study strong enough
to conclude that decreased incidence of breast cancer in BRCA1 and 2
patients can be directly attributed to drinking coffee.