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  • 1
    Electronic Resource
    Electronic Resource
    Sugar, meat, and fat intake, and non-dietary risk factors for colon cancer incidence in Iowa women (United States) (1994)
    Springer
    Cancer causes & control 5 (1994), S. 38-52 
    Details
    ISSN: 1573-7225
    Keywords: Anthropometry ; colonic neoplasms ; dietary fats ; females ; lifestyle ; meat ; prospective studies ; reproduction ; sucrose ; United States
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate the relation of dietary intakes of sucrose, meat, and fat, and anthropometric, lifestyle, hormonal, and reproductive factors to colon cancer incidence, data were analyzed from a prospective cohort study of 35,215 Iowa (United States) women, aged 55–69 years and without a history of cancer, who completed mailed dietary and other questionnaires in 1986. Through 1990, 212 incident cases of colon cancer were documented. Proportional hazards regression was used to adjust for age and other risk factors. Risk factors found to be associated significantly with colon cancer included: (i) sucrose-containing foods and beverages other than ice cream/milk; relative risks (RR) across the quintiles=1.00, 1.73, 1.56, 1.54, and 2.00 (95% confidence intervals [CI] for quintiles two and five exclude 1.0); (ii) sucrose; RR across the quintiles=1.00, 1.70, 1.81, 1.82, and 1.45 (CI for quintiles two through four exclude 1.0); (iii) height; RR=1.23 for highest to lowest quintile (P for trend-0.02); (iv) body mass index; RR=1.41 for highest to lowest quintile (P for trend=0.03); and (v) number of livebirths, RR=1.59 for having had one to two livebirths and 1.80 for having had three or more livebirths compared with having had none (P for trend=0.04). These data support hypotheses that sucrose intake or being tall or obese increases colon cancer risk; run contrary to the hypothesis that increased parity decreases risk; support previous findings of no association with demographic factors other than age, cigarette smoking, or use of oral contraceptives or estrogen replacement therapy; and raise questions regarding previous associations with meat, fat, protein, and physical activity.Cancer Causes and Control 1994, 5, 38–52.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01830725
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  • 2
    Electronic Resource
    Electronic Resource
    Early body size and subsequent weight again as predictors of breast cancer incidence (Iowa, United States) (1995)
    Springer
    Cancer causes & control 6 (1995), S. 112-118 
    Details
    ISSN: 1573-7225
    Keywords: Breast cancer ; body mass index ; females ; United States ; weight gain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: We examined whether associations of adult weight gain with the risk of postmenopausal breast cancer vary by stature, waist-hip ratio (WHR), and early adult size in a cohort of 37,105 Iowa (United States) women. Both low body mass index (kg/m2) (BMI) at age 18 and high subsequent weight-gain were associated independently with increased risk of incident postmenopausal breast cancer. After stratifying on BMI at age 18, high weight gain was associated with increased risk irrespective of whether early BMI was low (relative risk [RR]=1.92, 95 percent confidence interval [CI]=1.45–2.53) or high (RR=1.59, Ci=1.19–2.12). Women with lower BMI at 18 were at a higher risk at all levels of weight change, but having low BMI at age 18 and low subsequent weight gain conferred no significantly excess risk over those with high BMI at 18 and low gain. An inconsistent increase in risk was associated with taller stature; there was no additional risk associated with high WHR. Part of the observed risk from lower early size may reflect greater weight gain by lighter women. Limiting adult weight gain thus may be a feasible method to avoid increasing an individual's risk of breast cancer. Reasons for different effects of early cf late weight gain are not established, but benefits of a greater size at age 18 are likely to be offset by increased risks of other weight-related diseases at older ages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00052771
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  • 3
    Electronic Resource
    Electronic Resource
    Difficulty becoming pregnant and family history as interactive risk factors for postmenopausal breast cancer: the Iowa Women's Health Study (1993)
    Springer
    Cancer causes & control 4 (1993), S. 21-28 
    Details
    ISSN: 1573-7225
    Keywords: Breast neoplasms ; family history ; infertility ; Iowa Women's Health Study ; nulliparity ; prospective studies ; United States
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: We recently provided data from a prospective cohort study of postmenopausal women which suggested that a first livebirth at age 30 or older (cf before age 20) was associated with a twofold increased risk of breast cancer in women without a family history, but a 5.8-fold higher risk in women with a positive family history. To address the question of whether these observations reflect difficulty becoming pregnant or maintaining a pregnancy, we performed additional analyses in which the outcome of each pregnancy was considered. During five years of follow-up, 620 incident cases of breast cancer were identified in the 37,105 women at risk. There was little evidence for an increased risk associated with a history of spontaneous abortion (relative risk [RR]=1.1; 95 percent confidence interval [CI]=0.9–1.4), nor was the risk higher among women who reported two or more spontaneous abortions in consecutive pregnancies (RR=1.0, CI=0.7–1.4). Although women who reported that they had tried unsuccessfully to become pregnant had only slightly and nonsignificantly elevated risks of breast cancer (RR=1.1, CI=0.9–1.3), a more pronounced and statistically significant association was noted in women with a positive family history (RR=2.0, CI=1.4–3.2). There was a strong inverse association between failure to become pregnant and parity (P〈0.0001); nearly 50 percent of the nulliparous married women reported having tried and failed to become pregnant, whereas the frequency was only 6.8 percent among married women with five or more livebirths. Thus, difficulties in becoming pregnant may characterize a subset of women at increased risk of breast cancer, especially in the presence of a family history.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051710
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    Paper (German National Licenses)
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