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This study examined the survival of women according to male microchimerism status.

Methods Male microchimerism presence, measured as Y chromosome in peripheral blood samples, was determined in 272 women from the large Danish Diet, Cancer and Health cohort when aged 50–64 years during 1993–97.

Also, we evaluated all-cause mortality in strata of male microchimerism concentration (negative, female cells).

Despite availability of a range of lifestyle, anthropometric and reproductive variables, we chose a priori only to adjust the estimates of relative survival for baseline smoking (never, former, current). death, migration or end of follow-up, whichever occurred first.

Originally, all participants were followed until 27 April 2006 for incident cancers in the Danish Cancer Registry Using the combined information from the Diet, Cancer and Health cohort and the linked registers, we used case-cohort sampling to identify a subset of female participants who developed breast or colon cancer and a subset of female controls.

From peripheral blood buffy coat specimens drawn from each woman, genomic DNA was isolated and tested for amplification product was mitigated against by utilizing Amp Erase Taq Man chemistry (Applied Biosystems).

We first fitted a crude Cox regression model to predict the unadjusted absolute survival according to attained age and male microchimerism status.

Next, we fitted multivariate Cox regression models to estimate survival among microchimerism positive women relative to that of microchimerism negative women, adjusted for attained age and baseline smoking.

During follow-up 21 deaths occurred, distributed as 11 deaths (52%) among microchimerism positive, and 10 deaths (48%) among microchimerism negative women.

Mean age at interview was 57 years (range 50–65, -value 0.06).

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