Background: Cancer and diabetes are the second and twelfth leading global causes of death, respectively. Cancer incidence is increased in diabetics compared to non-diabetics. Common pathobiological pathways are shared by the two diseases: hyperglycaemia, hyperinsulinaemia, chronic inflammation and altered concentrations of endogenous hormones. These pathways can all directly or indirectly be linked to chronic hyperglycaemia. Lifestyle factors also affect cancer, diabetes and hyperglycaemia. Hypothesis: Chronic hyperglycaemia is the common biological pathway linking cancer, diabetes and lifestyle factors. Chronic hyperglycaemia can be assessed by monitoring glycated haemoglobin (HbA1c) levels. Aim: The first aim is to investigate whether the link between diabetes and increased cancer risk can be explained by increasing HbA1c levels. Secondly, glycaemic and overall models of lifestyle factors should be developed and compared to determine the relative influence of lifestyle factors on blood glucose level and, subsequently, cancer risk. This could clarify whether improved glycaemic control via lifestyle factors is sufficient to significantly reduce cancer risk. Method: Dose-response meta-analyses on cancer risk and HbA1c levels were performed and the results communicated via a research article. Statistical glycaemic and overall models were developed from published studies on colorectal cancer (CRC), lifestyle factors and HbA1c, via meta-analysis. Log-linear and restricted cubic spline models were considered for studies relating CRC risk to lifestyle factors or HbA1c. Linear models were considered for studies relating HbA1c to lifestyle factors. Only statistically significant models were compared. Results: Increased cancer risk with increasing HbA1c levels was present for a number of cancers, with some cancer types also showing increased risk in the pre-diabetic and normal HbA1c ranges. Comparison of the glycaemic and overall models revealed that HbA1c significantly affected cancer risk and was significantly affected by lifestyle factors. However, the overall effects of lifestyle factors were much stronger than their glycaemic effects (between 9% and 25% difference in risk between overall effects and glycaemic effects at the exposure levels analysed). Glycaemic and overall models for cigarette smoking and chronic stress revealed increased cancer risk with increasing exposure, but decreased cancer risk for increased dietary fibre intake. The glycaemic model for alcohol consumption displayed decreased cancer risk, while the overall model revealed increased cancer risk, emphasising the strong effect of carcinogenic substances in alcohol. Conclusions: Risk for a number of cancers increased with HbA1c levels in diabetic and non-diabetic persons. Cancer prevention by improved blood glucose control seems plausible. The overall effects of lifestyle factors on cancer risk are much stronger than their glycaemic effects. Lifestyle factors alone do not provide enough reduction in blood glucose levels. Other therapeutic strategies for reducing blood glucose levels, such as pharmacotherapeutics or fasting, should be investigated. The possible harmful effects of reducing blood glucose levels, such as neuroglycopaenia, should be considered before implementation of therapeutic strategies. Although there seems to be a strong association between HbA1c and cancer risk, this does not imply causality. The possibility of residual confounding cannot be ignored, even though the most adjusted estimates were used to develop the models, where possible. / MIng (Electrical and Electronic Engineering), North-West University, Potchefstroom Campus, 2014

This dissertation refines knowledge synthesis from publicly accessible databases, based on the model of D.R. Swanson. Knowledge synthesis endeavors bring together two or more non-interactive literatures to create combinatorial research data on a specific topic. In this endeavor the biomedical literature was searched on the anti-neoplastic agent nordihydroguaiaretic acid (NDGA) for its potential role as a functional food in the chemoprevention of breast cancer. Bibliometric cocitation was utilized to identify complementary but non-interactive literatures in the disciplines of biomedicine and dietary science. The continuing specialization and fragmentation of the cancer literature degenerates the potential usefulness of cross-disciplinary research and information. As the biomedical sciences become more specialized the potential increases for isolation of discoveries and for failures to connect science to the needs of the people. Within the information science discipline several techniques are available to bridge the isolation between discoveries recorded in different sets of literatures. Electronic database searching with combinatorial keyword entries, syllogistic modeling and bibliometric author cocitation analysis are the principle techniques applied in this endeavor. The research questions are addressed to the absence or presence of human in vivo research on breast cancer with the potentially chemopreventative functional food NDGA. Utilizing a syllogistic model the literatures of functional foods, nordihydroguaiaretic acid and breast cancer were searched with designated combinatorial keywords. The documents retrieved were subjected to author cocitation analysis to demonstrate disjointness or connectivity of the two complementary literatures. The results demonstrated a possible preventative relationship between breast cancer in women and nordihydroguaiaretic acid, a phytochemical antioxidant and potential functional food. The results of this study are consistent with D.R. Swanson's pioneering work in knowledge synthesis. Swanson's methods can be used to identify non-interactive, disjoint literatures. Continuing support for his techniques has been demonstrated.

Background: Many studies have reported that adherence to health promotion guidelines for diet, physical activity, and maintenance of healthy body weight may decrease cancer incidence and mortality, including site-specific cancers such as colorectal cancer. To date, there have been no studies investigating adherence to the American Cancer Society's (ACS) Nutrition and Physical Activity Cancer Prevention Guidelines and the development and characteristics of premalignant lesions. Several individual lifestyle factors targeted by the ACS guidelines have also been associated with circulating concentrations of vitamin D metabolites. These associations suggest that adherence to the ACS guidelines may be related to improved vitamin D status. This dissertation sought to 1) synthesize the evidence from published prospective cohort studies regarding adherence to the ACS and World Cancer Research Fund/American Institute for Cancer Research (WCRF/AICR) nutrition and physical activity cancer prevention guidelines and the risk of overall cancer incidence and/or cancer mortality and 2) to further explore the role of adhering to a healthy lifestyle pattern as outlined by the ACS guidelines on a) colorectal adenoma occurrence and b) circulating concentrations of vitamin D metabolites using secondary data analyses from completed large prevention trials. Methods: A systematic review was performed to examine associations between adherence to established cancer prevention guidelines for diet and physical activity and overall cancer incidence and mortality. PubMed, Google Scholar, and Cochrane Reviews databases were searched following the current recommendations of Preferred Reporting Items for Systematic Reviews and Meta-analysis Approach (PRISMA). Cross-sectional and prospective analyses of pooled participants were also conducted from the Wheat Bran Fiber (n=503) and Ursodeoxycholic Acid (n=854) trials. A cumulative adherence score was constructed using baseline data regarding body size, diet, physical activity, and alcohol consumption. Continuous vitamin D metabolite concentrations and clinically significant vitamin D categories were evaluated with adherence score category using multiple linear and logistic regression models, respectively. Baseline adenoma characteristics and new colorectal adenomas were evaluated by adherence score category using multivariate logistic regression models. Results: Twelve studies met inclusion criteria for the systematic review. High versus low adherence to established nutrition and physical activity cancer prevention guidelines was consistently and significantly associated with decreases of 10-61% in overall cancer incidence and mortality. Consistent significant reductions were also shown for breast cancer incidence (19-60%), endometrial cancer incidence (23-60%), and colorectal cancer incidence in both men and women (27-52%). Findings for lung cancer incidence were equivocal and no significant relationships were found between adherence and ovarian or prostate cancer. In the pooled analyses, concentrations of circulating 25-hydroxycholecalciferol [25(OH)D] were statistically significantly higher among participants with high versus low adherence to guidelines (31.4 ± 0.8 and 26.3 ± 0.8 ng/ml, respectively; p<0.001). For 1,25(OH)₂D concentrations, high adherence was again significantly related to greater metabolite levels, with mean concentrations of 36.4 ± 1.1 and 31.2 ± 1.2 pg/mL for high- and low-adherers, respectively (p<0.001). Furthermore, the odds of attaining sufficient 25(OH)D status were 4.30 times higher for those most adherent versus those least adherent (95% CI: 2.43-7.60). Significantly reduced odds of having three or more adenomas at baseline were shown for moderate (odds ratio [OR]=0.67, 95% confidence intervals [CI]: 0.46-0.99) and highly adherent (OR=0.50, 95% CI: 0.31-0.81) participants compared to those with low adherence (p-trend=0.005). Conversely, guideline adherence was not associated with the development of a new colorectal adenoma (moderate adherence OR=1.16, 95% CI: 0.85-1.59, high adherence OR=1.23, 95% CI: 0.85-1.79). Conclusion: From the systematic review, greater adherence to cancer prevention guidelines for diet and physical activity was consistently associated with lower risks of overall cancer incidence and mortality, including for some site-specific cancers. In addition, adherence to the ACS guidelines was associated with higher concentrations of both of 25(OH)D and 1,25(OH)₂D. Following the ACS guidelines could potentially increase 25(OH)D levels as much as that observed by a supplement of 1000 IU/d in a population similar to ours, and therefore may be a viable strategy for increasing both 25(OH)D and 1,25(OH)₂D concentrations. Further, our findings suggest that following the ACS Nutrition and Physical Activity guidelines may lead to a lower odds of multiple adenomas when at least one adenoma is detected. Finally, these guidelines and recommendations are consistent with strategies for the prevention of major diseases, and if followed, will ultimately lead to healthier lives overall.

Background: Skin cancer is the most common form of cancer in the United States and is a public health concern. There are over 5 million new cases of keratinocyte skin cancer (KC) (previously known as non-melanoma skin cancer) and over 65,000 new cases of melanoma annually in the United States. Skin cancer is highly preventable, although prevention methods are not commonly practiced. Nurse practitioners have a key role in educating and encouraging patients to practice skin cancer prevention methods. Purpose/Aims: The purpose of this project was to determine whether a brief educational video can improve nurse practitioner knowledge, attitudes, and behaviors regarding skin cancer and skin cancer prevention counseling. Methods: A single subject pre-test post-test design guided this project. Participants completed an online pretest assessing skin cancer knowledge, attitudes, and behaviors. Following the pretest participants were given access to the video intervention. The intervention included information about skin cancer and published guidelines about skin cancer prevention counseling. Changes in knowledge, attitudes, and behaviors and satisfaction with the intervention were assessed through a post-test. Results: A total of 30 eligible Arizona nurse practitioners completed both the pretest and posttest surveys. There was a statistically significant increase (p=.000) in knowledge from 64.17% on the pretest to 87.5% on the posttest. Attitudes about skin cancer and skin cancer counseling were fair on the pretest and significantly improved (p=.000) on the posttest. On the pretest, nurse practitioners had poor attitudes regarding skin cancer prevention counseling practice behaviors. These attitudes favorably increased (p=.009) on the posttest. Self-reported practice behaviors also improved significantly following the intervention (p=.000). Participants' attitudes regarding the intervention were generally favorable. Conclusions: A brief educational intervention offered online to nurse practitioners is highly effective for improving their knowledge, attitudes, and behaviors regarding skin cancer and skin cancer prevention counseling. The intervention is feasible to administer and is acceptable to nurse practitioners.

Liu Bonnie Pui-ling. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 134-163). / Abstracts in English and Chinese. / Acknowledgments --- p.i / Abbreviations --- p.ii / Abstract / English --- p.1 / Chinese --- p.3 / Chapter Chapter 1 --- General Introduction / Chapter 1.1 --- Colorectal Cancer Statistics --- p.5 / Chapter 1.2 --- Colon Cancer --- p.5 / Chapter 1.3 --- Treatment --- p.6 / Chapter 1.4 --- Effects of Cytotoxic Drug Treatment --- p.7 / Chapter 1.5 --- Cell Cycle --- p.8 / Chapter 1.6 --- Oxidases --- p.9 / Chapter 1.7 --- Chemistry of Novel β-carboline: Tangutorine --- p.11 / Chapter 1.8 --- Aim of Study --- p.14 / Chapter Chapter 2 --- Cytotoxicity / Chapter 2.1 --- Introduction --- p.15 / Chapter 2.2 --- Materials and Methods --- p.18 / Chapter 2.3 --- Results --- p.23 / Chapter 2.4 --- Discussion --- p.44 / Chapter Chapter 3 --- Oxidase Activity and Protein Oxidation / Chapter 3.1 --- Introduction --- p.48 / Chapter 3.2 --- Materials and Methods --- p.54 / Chapter 3.3 --- Results --- p.60 / Chapter 3.4 --- Discussion --- p.80 / Chapter Chapter 4 --- Cell Cycle / Chapter 4.1 --- Introduction --- p.89 / Chapter 4.2 --- Materials and Methods --- p.93 / Chapter 4.3 --- Results --- p.96 / Chapter 4.4 --- Discussion --- p.118 / Chapter Chapter 5 --- General Discussion --- p.126 / References --- p.134

Cervical cancer incidence in the United States has declined for the past 40 years, yet the odds of developing cervical cancer is much higher among marginalized women, particularly African American and Hispanic American women. Although preventable through vaccination against the human papillomavirus (HPV) prior to infection, uptake and completion rates of the vaccine among African American and Hispanic American women are low. The purpose of the study was to determine if a significant relationship existed between the health literacy levels of African American and Hispanic American women, ages 18-26, and the low HPV vaccination uptake. The integrated behavioral model, which identifies factors antecedent to behavioral intention, as well as the motivating variables, was the theoretical framework. Secondary data from the 2015 National Health Interview Survey were used to examine the relationships among the variables of interest. A logistic regression (n = 2093) showed that health literacy is a strong determinant of HPV vaccine behavior intention, and that there was a significant relationship between health literacy and HPV vaccine initiation. Health literacy mediated the relationships between the motivating variables and the vaccine uptake, and completely mediated the relationship between ethnicity and HPV vaccine uptake. Health literacy did not independently predict the vaccine initiation. The findings from this study might (a) provide public health practitioners with enough information to guide health promotion activities to increase the vaccination coverage to the level expected in Healthy People 2020, (b) save economic resources through cancer prevention, and (c) improve lives by curbing the excess deaths among racial minority women.

The colorectal cancer (CRC) incidence in Ashkenazi Jews has been found to be highest of any ethnic group in the world (Feldman, 2001). It is currently unclear how culture and religion influence health behaviors of U.S. Ashkenazi Jews, as well as what other socio-cultural factors influence AJ women's attitudes towards CRC risk and screening practices. This study aimed at exploring and describing the cultural and religious influences on health behaviors and beliefs related to CRC in Ashkenazi Jewish women. Research participants included seven key informants (rabbis) and forty-two Ashkenazi Jewish women ages 50 and up. Methods included in-depth, qualitative interviews and focus groups. The study also utilized a demographic survey which included questions about baseline knowledge of colorectal cancer in Ashkenazi Jews, and a ten-item American Cancer Society's Questionnaire on Experiences with and Attitude toward CRC Screening. Participants were recruited from Tampa synagogues and community using non-probabilistic sampling. Results revealed only 5% of participants were aware of the increased prevalence of colorectal cancer in Ashkenazi Jews; still, most participants (88%) were up to date on colorectal cancer screening. Judaic purity laws did not resonate with many participants, and for those who did follow them, they did not take a view of bodily functions as being impure. A consistent description of a 'Jewish way' of looking at health emerged, involving both the push for education, which increases knowledge about and access to healthcare, as well as the core Jewish tenet of the infinite value of life. No significant differences were found among the screening practices of the three self-identified denominations, and only breast and cervical cancer screening were found to be significantly different between those who have ever had a CRC screening and those who have not. Recommendations highlight the need for future research in this area including larger samples, further exploring core Jewish tenets as related to health behaviors in this population, partnering with the Jewish community for interventions, and addressing ways to better track CRC incidence, mortality and screening in this population in order to raise awareness.

Includes tables and graphs. Includes bibliographic references : p 160-168.

Introduction: Colon cancer incidence and mortality rates in Canada are among the highest worldwide. If detected early colon cancer is highly curable and regular screening can significantly decrease risk of colon cancer mortality. Despite this, screening rates in Canada are consistently low and immigrant and senior populations are particularly vulnerable due to low health literacy and language barriers. This research consists of three studies that were designed to explore the cancer prevention experiences of older English-as-a-Second Language (ESL) Chinese immigrant women in Canada. This includes an investigation of colon and breast cancer screening utilization, health literacy skills and comprehension of colon cancer prevention information, and experiences and preferences when seeking cancer information by these immigrant women. Methods: A convenience sample of 110 Mandarin and Cantonese-speaking ESL immigrant women were recruited from two Southern Ontario communities. For study inclusion participants were required to: (1) be 50 years of age or older, (2) have immigrated to Canada, (3) have Cantonese or Mandarin as their first language and English as their second language, and (4) be able to read in English. Participants were excluded if they or their spouse had been previously diagnosed with any type of cancer. Participants completed a battery of questionnaires assessing demographic characteristics, use of breast and colon cancer screening, acculturation, self-efficacy, health beliefs and health literacy. Health literacy was assessed using the Short Test of Functional Health Literacy in Adults (S-TOFHLA) and comprehension of a colon cancer prevention information sheet from Cancer Care Ontario was assessed using the cloze procedure. Participants participated in a semi-structured interview to explore cancer information seeking preferences and experiences, and their understanding of cancer prevention information. Multivariate logistic regression was used to identify predictors of colon and breast cancer screening. To identify variables significantly associated with performance on the S-TOFHLA and cloze test regression analyses were performed. Directed content analysis was used to identify themes associated with barriers to cancer information seeking and understanding that emerged from the interviews. Results: Study #1: There was high self-reported screening for breast and colon cancer. Eighty-five percent of the women were current mammography screeners and 75% were current colon cancer screeners. Recommendation from a physician (OR=.140; 95% CI= .044, -.448), having a female physician (OR=.141; 95% CI= .033, .591), and high or moderate proficiency in English (OR=.283; 95% CI= .089, .902) significantly predicted mammography screening. Physician recommendation (OR=.103; 95% CI= .031, .349), first language (OR= 1.85; 95% CI= .055, .628) and higher self-efficacy (OR= 3.613; 95% CI= 1.179, 11.070) predicted use of colon cancer screening. Other important predictors included greater health literacy and longer residency in Canada. Study #2: Only 38.7% of the women had adequate health literacy on S-TOFHLA and 54.3% had adequate comprehension of the colon cancer information. Comprehension of the colon cancer information was significantly lower among women who received the information in English, compared to those who received the information in Chinese (p<0.01). Age, acculturation, self-reported proficiency reading English, and education were significant predictors of health literacy but varied depending on the measure (S-TOFHLA, cloze) and language of information (English, Chinese). Study #3: There were unique health information seeking preferences among the older Chinese immigrant women including a strong preference for interpersonal and interactive cancer information from their physician and trusted others, such as friends and family. Barriers to cancer information seeking included language difficulties and limited time with physicians. Differences in health literacy did not distinguish the women on any of the major themes. Conclusion: Language, culture, health literacy and the role of the physician emerged across all three studies examining the cancer prevention experiences of older Chinese immigrant women. While language concordant educational materials may improve understanding of cancer information, the results from this study suggest that it is important to consider factors other than language alone and to address important cultural issues that play a role in the access, use, and understanding of cancer information.

Thesis (MTech. degree in Nursing)--Tshwane University of Technology, 2010. / Cervical cancer, breast cancer and Kaposi's sarcoma are the three most common cancers in women in sub-Saharan Africa. The health care providers in developing countries regularly encounter women with advanced, incurable cervical cancer. Cervical cancer can however, be prevented, even among women at high risk for the disease, through screening using relatively simple technologies. The purpose of the study was to determine whether the supportive-educative role of the oncology nurse can contribute to the prevention of primary and secondary cervical cancer, breast cancer and Kaposi's sarcoma in women living in Soshanguve, South Africa.