Understanding the complex relationships underlying hot flashes: a Bayesian network approach.

OBJECTIVE: The mechanism underlying hot flashes is not well-understood, primarily because of complex relationships between and among hot flashes and their risk factors. METHODS: We explored those relationships using a Bayesian network approach based on a 2006 to 2015 cohort study of hot flashes among 776 female residents, 45 to 54 years old, in the Baltimore area. Bayesian networks were fit for each outcome (current hot flashes, hot flashes before the end of the study, hot flash severity, hot flash frequency, and age at first hot flashes) separately and together with a list of risk factors (estrogen, progesterone, testosterone, body mass index and obesity, race, income level, education level, smoking history, drinking history, and activity level). Each fitting was conducted separately on all women and only perimenopausal women, at enrollment and 4 years after enrollment. RESULTS: Hormone levels, almost always interrelated, were the most common variable linked to hot flashes; hormone levels were sometimes related to body mass index, but were not directly related to any other risk factors. Smoking was also frequently associated with increased likelihood of severe symptoms, but not through an antiestrogenic pathway. The age at first hot flashes was related only to race. All other factors were either not related to outcomes or were mediated entirely by race, hormone levels, or smoking. CONCLUSIONS: These models can serve as a guide for design of studies into the causal network underlying hot flashes.

Association between race and hot flashes in midlife women.

OBJECTIVE: Studies suggest that African American women may have a greater risk of hot flashes compared to Caucasian women, but the reasons for this are unknown. This study tested the hypothesis that African American women have an increased risk of hot flashes due to racial differences in risk factors for hot flashes, including high body mass index (BMI) and lower estrogen levels. METHODS: A population-based study was conducted among women aged 45-54 years. Participants were divided into women who reported ever experiencing hot flashes (n=356) and women who reported never experiencing hot flashes (n=257). Participants provided a blood sample for hormone assays, were weighed and measured, and completed a questionnaire. RESULTS: Among peri-menopausal women, African American women were more likely than Caucasian women to report any hot flashes (RR=2.08), severe hot flashes (RR=2.19), and hot flashes for more than 5 years (RR=1.61). The risk ratios for the associations between race and the hot flash outcomes were attenuated after controlling for other important hot flash risk factors (i.e. obesity and low estrogen levels). CONCLUSIONS: African American women have an increased risk of hot flashes compared to Caucasian women due to racial differences in a number of risk factors for hot flashes, including advanced age, obesity, current smoking, less than 12 drinks in the past year, and lower estrogen levels.

The association between menopausal symptoms and quality of life in midlife women.

This cross-sectional study examined 1,096 midlife women, associating menopausal symptoms, including hot flashes, vaginal dryness, sore joints, incontinence, irritability, mood changes, and headache, with quality of life (QOL), as measured using Cantril's Ladder of Life. The results showed that low QOL may be significantly associated with feeling tense and mood changes, but not the other selected symptoms.

Metallothionein expression in invasive and in situ breast carcinomas.

BACKGROUND/METHODS: The primary aims of this study were to examine the expression of metallothionein (MT) in 123 primary invasive breast carcinomas and the in situ components of these carcinomas and to assess the association between MT expression and certain socio-demographic and clinico-pathologic characteristics. MT expression was assessed using immunohistochemical procedures and semi-quantified using an immunoreactivity score. RESULTS: Results showed that 57.7% of the invasive tumors and 43.3% of the in situ carcinomas in the study were MT-positive. Chi-squared analyses showed that MT expression was significantly higher in the tumors of women categorized as being of 'other' race and of women with tumors of high histological grade. CONCLUSIONS: The results of this study suggest that MT is a biomarker of tumor differentiation and aggressiveness and that MT expression may differ by race.